Urolithin A production drives the effects of pomegranate on the gut microbial metabolism of bile acids and cholesterol in mild dyslipidaemic overweight and obese individuals
Abstract
This work has been funded by the Projects 20880/PI/18 (Fundación Séneca de la Región de Murcia, Spain), PID2022-136419OB-100 and AGROALNEXT programme by the Ministry of Science and Innovation (MICIN, AEI/10.13039/501100011033, and PRTR-C17.I1, Spain) with funding from “ERDF A way of making Europe”, the European Union NextGenerationEU (PRTR-C17.I1) and by Fundación Séneca with funding from Comunidad Autónoma Región de Murcia (CARM). C.E.I.-A. holds a predoctoral grant from MICIN (grant number FPU18/03961)
Full text
Food &
Func ion
PAPER
Ci e his: Food Func ., 2024, 15, 2422
Recei ed 14 h No embe 2023,
Accep ed 22nd Janua y 2024
DOI: 10.1039/d3 o05014a
sc.li/ ood- unc ion
U oli hin A p oduc ion d i es he effec s o
pomeg ana e on he gu mic obial me abolism o
bile acids and choles e ol in mild dyslipidaemic
o e weigh and obese indi iduals
Ad ián Co és-Ma ín, †
a,b
Ca los E. Iglesias-Agui e, †
a
Alicia Ma ín,
a
Ma ía Romo-Vaque o,
a
Fe nando Vallejo,
a
Juan Ca los Espín
a
and
Ma ía Vic o ia Selma *
a
The me abolism o (poly)phenols and some hos me aboli es, including bile acids (BAs) and choles e ol,
a ies among indi iduals depending on hei gu mic obio a. The gu mic obial me abolism o ellagi an-
nins (ETs) and ellagic acid (EA) p oduces u oli hins (U os), yielding h ee me abo ypes wi h quan i a i e
and quali a i e diffe ences based on dissimila U o-p oducing p ofiles (UM-A, UM-B, and UM-0, i.e., non-
p oduce s). P e ious animal s udies demons a ed ha polyphenols impac BAs and choles e ol mic obial
me abolism, bu da a on hei effec s in humans and da a ega ding he in e -indi idual a iabili y o hese
me abolic con e sions a e scan . We e alua ed whe he UMs, as dis inc i e unc ional gu -mic obiome
signa u es, could de e mine he po en ial effec o a pomeg ana e ex ac (PE) ich in ET-EA on he
me abolism o BAs and choles e ol in mild dyslipidaemic o e weigh -obese indi iduals, wi h possible con-
sequences on hos -lipid homeos asis and gu heal h. A he baseline, UM-B p esen ed he highes le els
o aecal o al and seconda y BAs and cop os anol, sugges ing ha he lipid abso p ion capaci y and gu
cy o oxic isk could be augmen ed in UM-B. PE in ake significan ly educed aecal cop os anol and BA
p oduc ion, especially seconda y BAs, and modula ed he gu mic obiome, educing he gu cy o oxic
isk, especially in UM-B indi iduals. The lowe ing o aecal mic obial cop os anol and BAs and some BA-
me abolising bac e ia was quan i a i ely co ela ed wi h U o concen a ions, mainly aecal U o-A. This
sugges s ha PE consump ion could exe ca dio ascula and gu p o ec ion h ough U o-A p oduc ion
as a di ec d i e o he effec s and indi ec ly by educing he Co iobac e iaceae amily and BA pool,
known ac o s in ol ed in he gu abso p ion o lipids.
In oduc ion
The human in es ine is colonised by se e al mic obial species
ha in e ac wi h die a y and hos -de i ed molecules in he
in es ine, signi ican ly con ibu ing o hos physiology.
1
The
gu mic obio a can p oduce diffe en me aboli es om se e al
die a y compounds, which exe biological ac i i y and play an
impo an ole in main aining gu and me abolic heal h. This
is he case o ellagi annins (ETs) and ellagic acid (EA) om
pomeg ana e, nu s, and be ies, which a e ex ensi ely me ab-
olised by he human gu mic obio a o p oduce diffe en u o-
li hins (U os) wi h po en ial heal h bene i s.
2
The human gu
mic obio a can also ans o m hos -de i ed molecules, such as
choles e ol and bile acids (BAs), which a e impo an signal-
ling me aboli es in he hos . Indeed, choles e ol and BAs sig-
ni ican ly impac hos lipid homeos asis.
3,4
Howe e , he e is a
consis en human in e -indi idual a iabili y in he mic obial
me abolism o die a y and hos -de i ed molecules depending
on he subjec s’gu mic obial signa u es.
5–7
One o he main diffe ences be ween he me abolic p o iles
associa ed wi h ET and EA me abolism is he inal U os p o-
duced (u oli hin me abo ypes, UMs). UM-A indi iduals only
yield u oli hin A (U o-A) as he inal ca aboli e. In con as ,
UM-B subjec s p oduce U o-A and, dis inc i ely, also isou o-
li hin A (IsoU o-A) and u oli hin B (U o-B). Finally, UM-0 indi-
iduals canno p oduce in e media e and inal U os in he ET–
EA me abolic pa hway.
8
Diffe ences in he human gu
mic obial ecologies associa ed wi h UMs we e p e iously
desc ibed.
9
UMs ha e also been p oposed as po en ial
†These au ho s con ibu ed equally o his wo k.
a
Labo a o y o Food & Heal h, Resea ch G oup on Quali y, Sa e y and Bioac i i y o
Plan Foods, CEBAS-CSIC, Campus de Espina do, Mu cia 30100, Spain.
E-mail: [email p o ec ed]s
b
APC Mic obiome I eland & School o Mic obiology, Uni e si y College Co k,
T12 YT20 Co k, I eland
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ca dio ascula disease isk bioma ke s because he blood lipid
p o ile was epo ed o be associa ed wi h UMs.
10,11
Howe e ,
he link o his associa ion emains unknown so a . On he
o he hand, ecen s udies ha e also e ealed in e -indi idual
diffe ences in he mic obial me abolism o choles e ol and
conjuga ed p ima y BAs, which migh exe a much wide
ange o biological ac i i ies han hose ini ially
ecognised.
4,12–14
In his ega d, seconda y me aboli es o
aecal choles e ol and BAs, p oduced by he gu mic obio a,
may p omo e heal h o a ou disease de elopmen depending
on he quan i y and ype p oduced. Speci ically, con inuous
exposu e o ele a ed luminal le els o seconda y BAs and
choles e ol mic obial me aboli es migh inc ease gu pe -
meabili y and suscep ibili y o in es inal in lamma ion and
colo ec al cance .
3
In addi ion o he oxic effec s o seconda y
s e oids pe se, he concen a ion o pu e ac i e compounds
could also inc ease gu oxici y due o he elease o amino
acids (glycine and au ine), which a e he p oduc s o he
mic obial hyd olysis o BAs.
12
The possibili y o modula ing he mic obial me abolism o
die a y and hos -de i ed molecules by a ge ing he gu mic o-
bio a composi ion o imp o e human heal h has only ecen ly
s a ed o be explo ed.
12,14
Indeed, some animal s udies ha e
begun o e alua e he impac o some polyphenols on he gu
mic obial ans o ma ions o BAs and choles e ol, as e iewed
p e iously.
12,14
These esul s sugges ha phenolic- ich die s
hampe he con e sion o p ima y BAs o seconda y BAs and
choles e ol o cop os anol.
12
Howe e , u he s udies a e
c ucial o es ablish whe he he effec s obse ed in animal
s udies can be eplica ed in humans, and mo e da a ega ding
he ole o he gu mic obial me abolism o polyphenols in he
in e -indi idual diffe ences o hese me abolic con e sions a e
needed.
In he POMEca dio ial, we desc ibed he UM-dependen
effec s on ca dio ascula isk ma ke s a e consuming a
pomeg ana e ex ac (PE) in o e weigh -obese indi iduals wi h
mild dyslipidemia.
10
In he p esen s udy, we aimed o e alu-
a e (i) he effec s o PE in ake in hese olun ee s on he gu
mic obial me abolism o BAs and choles e ol, (ii) whe he
hese effec s o PE could also be U o-dose-dependen , (iii) he
possible link be ween BAs and choles e ol me abolism and he
gu mic obio a signa u e associa ed wi h UMs, and (i ) es ab-
lish a possible link be ween BAs and choles e ol me abolism,
U o p oduc ion capaci y, mic obial ela i e abundances and
ca dio ascula isk ma ke s imp o emen . To his pu pose, he
esul s we e analysed conside ing he pa icipan s as a single
g oup and a e clus e ing he olun ee s acco ding o hei
UMs (UM-A, UM-B, and UM-0).
Ma e ials and me hods
Chemical and eagen s
S anda ds o cholic acid (CA), chenodeoxycholic acid (CDCA),
deoxycholic acid (DCA), li hocholic acid (LCA), isoli hocholic
acid (iso-LCA), u sodeoxycholic acid (UDCA), cop os anol,
choles e ol, 5α-choles ane, sodium ace a e, and sodium
hyd oxide we e pu chased om Sigma-Ald ich (S Louis, MO,
USA). U o-A, IsoU o-A, U o-B, and hei de i ed phase-II conju-
ga ed me aboli es we e chemically syn hesised and pu i ied by
Villapha ma Resea ch S.L. (Pa que Tecnológico de Fuen e
Álamo, Mu cia, Spain). HPLC-g ade ace oni ile, hexane, cyclo-
hexane, me hanol, and e hanol we e pu chased om JT Bake
(De en e , The Ne he lands), and o mic acid was pu chased
om Pan eac (Ba celona, Spain). Milli-Q sys em (Millipo e
Co p., Bed o d, MA, USA) ul apu e wa e was used h oughou
he s udy. PE was encapsula ed in iden ical ha d gela in cap-
sules supplied by Labo a o ios Admi a S.L. (Alcan a illa,
Mu cia, Spain), ollowing he Eu opean Union’s good manu-
ac u ing p ac ices. Capsules we e bo led wi h a speci ic blind
code o pa icipan s and esea che s. Each capsule (450 mg o
PE) con ained 160 mg o phenolic compounds, as p e iously
desc ibed.
10
The phenolic con en o PE capsules was analyzed
by HPLC-DAD-ESI-MS/MS, as p e iously desc ibed, and was as
ollows: 54.5 ± 1.2 mg punicalagins, 45.4 ± 0.9 mg ee ellagic
acid, 2.7 ± 0.2 mg punicalin, 2.6 ± 0.1 mg ellagic acid-hexoside
and 1.2 ± 0.1 mg ellagic acid-pen oside.
10
A e acid hyd olysis,
he o al ellagi annin con en pe capsule was 72.9 ± 1.1 mg
ee ellagic acid, 69.3 ± 0.9 mg gallagic acid dilac one, 10.3 ±
0.1 mg sanguiso bic acid, 3.1 ± 0.04 mg gallic acid, 2.9 ±
0.2 mg punicalin and 1.9 ± 0.2 mg aloneic acid dilac one.
10
S udy design and subjec s
U ine, aecal and blood samples we e ob ained in a p e ious
ial (POMEca dio), included in he Eu opean ‘Bacchus
P ojec ’(FP7-KBBE-2012), egis e ed a clinical ials.go
(NCT02061098) and app o ed by he Spanish Na ional
Resea ch Council’s Bioe hics Commi ee (CSIC, Mad id, Spain)
( e e ence 312090), ollowing he e hical guidelines ou lined in
he Decla a ion o Helsinki (1975) and i s amendmen s.
B ie ly, ha s udy was designed o e alua e he effec o PE
consump ion in subjec s wi h mild hype lipidemia and po en-
ially inc eased gu dysbiosis. O e weigh -obese subjec s (BMI
>27kgm
−2
) o e 40 yea s, wi h no diagnosed ch onic disease,
we e included. Fi y pa icipan s we e ec ui ed, and 49 com-
ple ed he p o ocol. De ailed in o ma ion abou he design is
shown elsewhe e.
10
B ie ly, he s udy was a 6-mon h ollow-up,
double-blind, c osso e , dose- esponse, andomized, and
placebo-con olled ial. The s udy consis ed o wo es phases
wi h each es phase las ing o 3 weeks wi h a 3-week washou
pe iod be ween each es phase and a 3-week washou pe iod
a e he inal es phase. In he i s es phase, pa icipan s
consumed ei he one capsule o PE o placebo daily in a c oss-
o e ashion. In he second es phase, he same design was
ollowed bu olun ee s inges ed ei he ou capsules o PE o
placebo daily.
10
In he p esen s udy, conside ing he absence
o effec s a e consuming he placebo and he effec s obse ed
wi h PE a he maximum dose es ed, samples om wo ime
poin s we e analysed: a e consuming one capsule o PE daily
o 3 days and ou capsules daily o 3 weeks.
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Sampling p ocedu es
As desc ibed p e iously,
10
pa icipan s p o ided u ine and
aecal samples on he mo ning o each isi . Blood samples
we e collec ed in acu aine s be ween 8 : 00 and 9 : 00 a.m. o
minimise ci cadian a ia ions in he supine posi ion a e
20 min o es . Se um and plasma we e ob ained. All samples
we e s o ed a −80 °C un il u he analysis.
10
Blood lipid p o ile and u oli hin me abo ype de e mina ion
Se obiochemical a iables we e measu ed as p e iously
epo ed, including Tchol ( o al choles e ol), HDLc (high-
densi y lipop o ein choles e ol), LDLc (low-densi y lipop o ein
choles e ol), VLDLc ( e y low-densi y lipop o ein choles e ol),
TG ( iglyce ides), ApoA-1 (apolipop o ein A-1), ApoB (apolipo-
p o ein B), oxLDLc (oxidised LDLc), IDLc (in e media e-densi y
lipop o ein choles e ol), and HOMA-IR (Homeos a ic Model
Assessmen o Insulin Resis ance).
10
U ine and aecal
samples we e p ocessed and analysed by using an ul a-pe -
o mance liquid ch oma og aph coupled o a quad upole-
ime-o - ligh mass spec ome e using an elec osp ay in e -
ace (UPLC-ESI-QTOF-MS) o de e mine u oli hins as desc ibed
elsewhe e.
10,15
A baseline, u ine samples a e consump ion
o 1 capsule o 3 days we e used o s a i y olun ee s by
UMs.
10
Faecal choles e ol and cop os anol analyses
Choles e ol and i s mic obial me aboli e cop os anol we e
ex ac ed om aecal samples as p e iously desc ibed wi h
mino modi ica ions.
16
B ie ly, 50 µL o dilu ed aeces (1 : 10
wi h H
2
O Milli-Q) we e spiked wi h 20 µL o 5α-choles ane
(5 mmol L
−1
) as an in e nal s anda d o s e ol de e mina ion.
The hyd olysis p ocess was ca ied ou wi h 5 mL o eshly
p epa ed me hanolic sodium hyd oxide (1 mol L
−1
, 90%
me hanol) o 60 min a 70 °C. The neu al s e ols we e
ex ac ed wi h 4 mL o cyclohexane using a o ex mixe o
20 min. Samples we e cen i uged a 3500g o 5 min, and he
o ganic phase was sepa a ed and e apo a ed in a speed
acuum concen a o (Sa an SPD121P, The mo Fishe
Scien i ic, Mad id, Spain). The d ied samples we e hen econ-
s i u ed in 1 mL o hexane and il e ed h ough a 0.22 µm poly-
inylidene luo ide (PVDF) il e (Millipo e, The mo Fishe
Scien i ic, Mad id, Spain). The aecal choles e ol and cop os a-
nol le els we e hen de e mined by gas ch oma og aphy (GC)
coupled o mass spec ome y (MS).
16
An aliquo o 1 µL o
sample was injec ed in o he GC-MS sys em. Sepa a ion was
pe o med using an Agilen 7890A GC equipped wi h an
Agilen 5975C MS de ec o . Choles e ol and cop os anol we e
sepa a ed on an HP-5MS 30 m x 0.25 mm (i.d.) capilla y
column (Agilen ) wi h helium as he ca ie gas (1 mL min
−1
).
Injec ions we e ca ied ou in a spli less mode a 280 °C. The
o en empe a u e was i s held a 150 °C o 5 min, and hen
inc eased o 280 °C a a a e o 20 °C min
−1
, which was main-
ained o 10 min. Elec on impac mass spec a (EI-MS) we e
eco ded wi h an ionisa ion ol age o 70 eV and a empe a u e
sou ce o 230 °C. The acquisi ion was pe o med in scanning
mode. Iden i ica ion o choles e ol and cop os anol was based
on he e en ion ime o s anda d compounds and wi h he
assis ance o he NIST 08 lib a ies.
Faecal BA de e mina ion
BAs we e ex ac ed om aecal samples ollowing a alida ed
me hod wi h mino modi ica ions.
17
Fi y µL o dilu ed aeces
(1 : 10 wi h H
2
O Milli-Q) we e esuspended in 450 µL o cold
sodium ace a e buffe (50 mmol L
−1
, pH 5.6). 1.5 mL o pu e
e hanol was added, and he samples we e shaken a 1200 pm
o 15 min a 25 °C (The moCell Mixing Block MB-102, BIOER,
Hangzhou, China). A e cen i uga ion, he supe na an was
dilu ed ou imes wi h H
2
O Milli-Q and applied o a
Ch oma ix C18 S ca idge (270 mg) (Mache ey-Nagel, Dü en,
Ge many), which was p e iously condi ioned wi h 3 mL o
e hanol and hen 3 mL o wa e Milli-Q. Following he sample
loading, he ca idge was washed wi h 3 mL o Milli-Q wa e
o emo e wa e -soluble impu i ies. Finally, BAs we e elu ed
wi h 3 mL o e hanol and d ied using a speed acuum concen-
a o . The esidue was esuspended in 200 µL o me hanol
and il e ed h ough a 0.22 µm PVDF il e . The samples we e
dilu ed in me hanol (1 : 10) be o e injec ion in o an Agilen
1290 In ini y UPLC sys em coupled o he 6550 Accu a e-Mass
quad upole TOF mass spec ome e (Agilen Technologies,
Waldb onn, Ge many) using an elec osp ay in e ace wi h Je
S eam echnology. Sepa a ion was achie ed using a e e sed-
phase Po oshell 120 EC-C18 column (3 × 100 mm, 2.7 μm)
(Agilen Technologies, Waldb onn, Ge many) ope a ing a
25 °C. The mobile phases used we e wa e : o mic acid
(99.9 : 0.1 / ; phase A) and ace oni ile : o mic acid (99.9 : 0.1
/ ; phase B). BAs we e sepa a ed using he ollowing g adien
condi ions: 0–4 min, 50–90% phase-B; 4–7 min, 90–99%
phase-B; 7–10 min, 99% phase-B. Finally, he sys em e u ned
o he ini ial condi ions (50% phase-B) o 1 min, and he
column was e-equilib a ed o an addi ional 1 minu e. The
low a e was cons an a 0.4 mL min
−1
, and he injec ion
olume was 2 µL. The ope a ing condi ions we e as ollows:
gas empe a u e –150 °C, d ying ni ogen gas –14 L min
−1
,
nebulise p essu e –40 psi, shea h gas empe a u e –350 °C,
shea h gas low –11 L min
−1
. Spec a we e acqui ed in single
MS mode wi h a mass ange be ween m/z50 and 1500, nega-
i e pola i y, and a TOF spec al acquisi ion a e o 1.5 spec a
pe second. Be o e he analysis, he ins umen was calib a ed
ex e nally by injec ing a mix u e o e e ence compounds
(Tuning Mix) o ensu e mass accu acy du ing he MS analyses.
Con inuous in e nal calib a ion was pe o med du ing ana-
lyses using he signals a m/z112.9855 and m/z1033.9881.
Da a we e acqui ed using he Mass Hun e Wo ks a ion so -
wa e ( e sion B.08.00, Se ice Pack 1, Agilen Technologies)
and p ocessed using he Mass Hun e Quali a i e Analysis so -
wa e ( e sion B.08.00, Se ice Pack 1, Agilen Technologies).
All samples we e injec ed in he same ba ch, and he o de o
sample injec ion was andomised o p e en sample bias. The
quan i ica ion o BAs was de e mined by hei in e pola ion
wi hin he calib a ion cu e ob ained by he injec ion o hei
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co esponding s anda ds by peak a ea in eg a ion o hei
ex ac ed ion ch oma og ams.
Gu mic obio a analysis
Gu mic obio a analysis was pe o med by 16S DNA sequen-
cing ( a ge ing he V3–V4 hype a iable egions) on a MiSeq-
Illumina pla o m (FISABIO sequencing se ice, Valencia,
Spain) a e ex ac ing bac e ial DNA om he aecal samples
as de ailed elsewhe e.
18
The ob ained da a we e p ocessed o
cons uc Ope a ional Taxonomic Uni (OTU) ables a a 97%
simila i y h eshold o classi y axa a he genus le el, de e -
mine he phyla and amilies o which hey belong, and es i-
ma e he ela i e abundance o each OTU, as p e iously
desc ibed
19
bu using he las upda ed RDP classi ie da abase
2.13. Fu he mo e, in he p esen s udy, he indi iduals we e
clus e ed by UMs and he diffe ences in ela i e abundances
be o e and a e PE consump ion we e e alua ed h ough he
linea disc iminan analysis effec size (LE Se) algo i hm using
he online in e ace Galaxy (h ps://hu enhowe .sph.ha a d.
edu/galaxy/ oo ).
S a is ical analysis
S a is ical analyses we e pe o med using he SPSS so wa e
.28.0 (SPSS Inc., Chicago, IL, USA), and plo s we e gene a ed
using G aphPad P ism 7.0 (G aphPad So wa e, San Diego, CA,
USA). The Shapi o–Wilk es was used o examine da a no mal-
i y. Diffe ences be ween wo dependen g oups (i.e., be o e
e sus a e PE consump ion) we e analysed using he pai ed
S uden ’s - es o Wilcoxon signed ank es when da a dis i-
bu ion was no mal o non-no mal, espec i ely. The K uskal–
Wallis es , ollowed by Dunn’s es , was used o compa e mo e
han wo g oups (i.e., UM-A s. UM-B s. UM-0), and he co es-
ponding pai wise compa isons we e adjus ed by he
Bon e oni co ec ion o mul iple es s. Spea man’s ank co -
ela ion was pe o med o s udy associa ions be ween a iables
( aecal choles e ol and BAs, blood lipid p o ile, and speci ic
bac e ial g oups). A mul i a ia e model was applied o e alua e
he in e ac ion effec be ween UM and ime poin s on BA con-
cen a ion. S a is ical signi icance was se a *P< 0.05.
Resul s
Effec o PE in ake on he phenolic me aboli e p o ile
Fig. 1 shows he in e -indi idual diffe ences in U o-A concen-
a ions in he aeces and u ine om he o e weigh -obese indi-
iduals a e 3-week in ake o ou daily capsules o PE. The
aecal U o-A concen a ion ange was highe in he aeces om
UM-A (4–423 µg g
−1
aeces) han in he UM-B g oup (2–180 µg
g
−1
aeces), whe eas he u ina y U o-A concen a ion ange was
simila in he UM-A (0.1–86 mg pe 24 h in u ine) and UM-B
(0.1–89 mg pe 24 h in u ine) g oups (Fig. 1A and B).
Effec o PE in ake on aecal BAs and choles e ol me abolism
Fig. 2 shows he concen a ion o he aecal BAs and s e ols
analysed in he o e weigh -obese indi iduals a baseline and
a e a 3-week in ake o 4 capsules o PE. A baseline, second-
a y BAs (DCA and LCA) concen a ion p edomina ed in he
aeces compa ed o p ima y BAs (CA and CDCA) (Fig. 2B and
C). The o al BAs, seconda y BAs, cop os anol and he cop os-
anol/choles e ol a io we e signi ican ly lowe in he UM-0
han in he UM-B g oup (Fig. 2A, F, G, K and L). In con as ,
he p ima y BA concen a ion and aecal choles e ol did no
diffe among UMs a baseline (Fig. 2B and J).
A e PE consump ion o 3 weeks, a signi ican educ ion
o o al BAs, p ima y BAs, seconda y BAs, CA, CDCA, DCA,
LCA, UDCA, iso-LCA and cop os anol was obse ed when all
olun ee s we e conside ed and in he UM-A and UM-B sub-
g oups (Fig. 2). The cop os anol/choles e ol a io was also
educed upon he 3-week in ake o PE when all olun ee s
we e conside ed and in he UM-A g oup, bu was no signi i-
can ly educed in he UM-B g oup (Fig. 2L). In con as , hese
pa ame e educ ions we e no obse ed a e PE in ake in he
UM-0 g oup (Fig. 2). In addi ion, aecal choles e ol was no sig-
ni ican ly educed, al hough in he case o he UM-B g oup, i
was nea ly s a is ically signi ican (P= 0.056) (Fig. 2J).
Effec o PE in ake on he gu mic obio a composi ion
Linea disc iminan analysis (LDA) om LE Se analyses
showed an inc ease in he ela i e abundance o some bac-
e ial g oups, including he well-known bu y a e-p oducing
bac e ia Odo ibac e ( amily Odo ibac e aceae), Dysosmobac e
( amily Oscillospi aceae) and Pep oniphilus ( amily
Fig. 1 Faecal (A) and u ina y (B) u oli hin A (U o-A) in u oli hin me abo-
ype A (g een plo s) and u oli hin me abo ype B ( ed plo s) olun ee s
a e 3-week in ake o ou daily capsules o PE. *Es ima ed alues ha
we e calcula ed conside ing ha 1.3 g is he mean exc e ion o c ea i-
nine o e a 24-hou pe iod.
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Pep oniphilaceae) in all olun ee s a e 3 weeks o PE con-
sump ion (Fig. 3A). O he g oups also inc eased a e PE con-
sump ion, such as he p opiona e-p oducing gene a
Phocaeicola ( amily Bac e oidaceae) (Fig. 3A). On he o he
hand, PE consump ion dec eased he abundance o he BA-
deconjuga ing bac e ia in ol ed in he amino acid hyd olysis
om p ima y BAs such as Rombou sia ( amily Clos idiaceae),
as well as bac e ia in ol ed in p ima y BA me abolism o sec-
onda y and e ia y BAs, such as Sa cina ( amily Clos idiaceae)
and he amily Co iobac e iaceae (class Co iobac e iia)
(Fig. 3A). When he olun ee s we e s a i ied acco ding o
hei UMs, he modula ion o he gu mic obio a by PE
diffe ed depending on he UM (Fig. 3). Fo example, bac e ial
g oups ha inc eased by PE in all olun ee s g oup (Fig. 3A)
coincided wi h hose obse ed in UM-A olun ee s (Fig. 3B)
bu no in UM-B olun ee s, whe e no bac e ia inc ease was
obse ed (Fig. 3C). In addi ion, he genus Fla oni ac o
inc eased a e PE consump ion only in he UM-A g oup
Fig. 2 Faecal BAs (A-I) and s e ols (J-L) a baseline (blue ba s) and a e consuming PE o 3 weeks ( ed ba s) in all olun ee samples (“All”,n= 49)
o in hose g ouped by u oli hin me abo ypes: UM-0 (me abo ype 0, n= 6), UM-A (me abo ype A, n= 29) and UM-B (me abo ype B, n= 14).
*Significan diffe ences (P< 0.05).
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(Fig. 3B). In con as , some bac e ial g oups educed by PE in
all olun ee s such as Hyd ogenoanae obac e ium,Anae o us is
and he amily Co iobac e iaceae (Fig. 3A) coincided wi h hose
educed in UM-B (Fig. 3C), bu no wi h hose o UM-A, whe e
o he bac e ia, such as he well-known bile- esis an and BA-
me abolising bac e ia Acine obac e ( amily Mo axellaceae),
Pa imonas ( amily Pep oniphilaceae), Paeniclos idium ( amily
Clos idiaceae) and unclassi ied-En e obac e iaceae we e educed
(Fig. 3B). In addi ion, BA-deconjuga ing and BA-me abolising
bac e ia, such as Collinsella ( amily Co iobac e iaceae),
dec eased a e PE consump ion, bu only in he UM-B g oup
(Fig. 3C). In he case o he UM-0 g oup, he co esponding
LDA sco e om LE Se analyses showed ha PE consump ion
did no signi ican ly modi y he gu mic obio a composi ion
(Fig. 3D).
Associa ions be ween u oli hins, aecal BAs and s e ols, gu
mic obio a, and clinical se obiochemical a iables
The co ela ion analysis o quan i a i e a iables e ealed ha
bo h he o al U os and U o-A we e nega i ely co ela ed wi h
o al, p ima y, seconda y and e ia y BAs (Fig. 4A).
Acco dingly, CA and CDCA (p ima y BAs), DCA and LCA (sec-
onda y BAs), and UDCA and Iso-LCA showed nega i e co e-
la ions wi h aecal o al U os and U o-A (p esen in UM-A and
UM-B). U ina y and aecal U o-B (only p esen in UM-B) co e-
la ed nega i ely only wi h UCDA. The e o e, he aecal U o-A
concen a ion was he only me aboli e co ela ed wi h all he
aecal BAs analysed. Cop os anol was also nega i ely associa ed
wi h aecal U o-A, unlike aecal choles e ol and he cop os a-
nol/choles e ol a io (Fig. 4A). In con as , u ina y and aecal
U o-B nega i ely co ela ed wi h aecal choles e ol. The co e-
la ion analysis o aecal mic obio a ela i e abundances
e ealed ha some disc imina ing gene a upon PE consump-
ion co ela ed wi h mic obial me aboli es (Fig. 4B). Fo
example, some bac e ia ha inc eased a e PE consump ion
(Fig. 3), such as he p opiona e-p oducing Phocaeicola, he
bu y a e-p oducing Odo ibac e as well as Pa abac e oides, we e
posi i ely co ela ed wi h aecal U o-A, and nega i ely co e-
la ed wi h p ima y, seconda y, e ia y, and o al BAs (Fig. 4B).
In con as , some BA-deconjuga ing and BA-me abolising bac-
e ia dec eased a e PE consump ion (Fig. 3) and co ela ed
wi h he educ ion o BAs, especially seconda y and e ia y
BAs (Fig. 4B). These bac e ia included a BA-deconjuga ing
genus like Rombou sia, and bile- esis an and BA-me abolising
bac e ia like Sa cina ( amily Clos idiaceae), Acine obac e
( amily Mo axellaceae), Pa imonas ( amily Pep oniphilaceae)
and Collinsella, as well as i s amily (Co iobac e iaceae) and
class (Co iobac e iia). Fu he mo e, hese bac e ia we e nega-
i ely associa ed wi h aecal U o-A, bu his associa ion did no
each s a is ical signi icance in he case o Rombou sia (P=
0.053) and Pa imonas (P= 0.104). Faecal cop os anol was also
co ela ed wi h some disc imina ing bac e ia o PE consump-
ion. Fo example, bac e ial g oups ha inc eased a e con-
suming PE, such as Pa abac e oides, posi i ely co ela ed wi h
aecal U o-A and nega i ely co ela ed wi h cop os anol. In
con as , some bac e ia ha dec eased a e PE consump ion,
such as Sa cina,Anae o us is,Co iobac e iaceae, and
Co iobac e iia, posi i ely co ela ed wi h cop os anol concen-
a ion (Fig. 4B).
The se obiochemical a iables
10
co ela ed wi h some
mic obial me aboli es, including hose de i ed om BA
me abolism. Thus, p ima y BAs posi i ely co ela ed wi h
se um Tchol, LDLc, non-HDLc, VLDLc, TG, Apo-B, small
HDLc, small and la ge LDLc, insulin and HOMA-IR (Fig. 4C).
Acco dingly, CA and CDCA (p ima y BAs) we e also posi i ely
associa ed wi h mos o hese se obiochemical a iables. Some
Fig. 3 Linea disc iminan analysis (LDA) effec size (LE Se) o he gu mic obio a ha shows significan diffe ences in he aecal mic obiome a
baseline ( ed ba s) and a e consuming PE o 3 weeks (g een ba s) in all olun ee s (A) o in hose g ouped by u oli hin me abo ypes (B, C and D):
UM-A (me abo ype A, n= 29), UM-B (me abo ype B, n= 14) and UM-0 (me abo ype 0, n= 6).
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seconda y BAs, such as DCA, also showed posi i e co ela ions
wi h Tchol and small HDLc. Te ia y BAs posi i ely co ela ed
wi h HDLc, ApoB, and small HDLc. O he mic obial me ab-
oli es, such as cop os anol, did no co ela e wi h hese se o-
biochemical a iables.
Mic obial aecal U o-A was also no co ela ed wi h mos o
hem (Fig. 4C). In con as , aecal choles e ol was nega i ely
associa ed wi h HDLc, ApoA, and la ge HDLc and posi i ely
associa ed wi h insulin and HOMA-IR.
Discussion
The gu mic obio a, choles e ol, BAs, and heal h s a us a e
closely in eg a ed and in luence each o he , making i difficul
o asce ain whe he gu dysbiosis and modi ied BA pools a e
a cause o consequence o disease.
20
The gu mic obial con e -
sion o gu choles e ol eleases cop os anol as he main me ab-
oli e.
12
The p ima y BAs, CA and CDCA, a e syn hesised om
choles e ol in he li e and s o ed in he gallbladde (conju-
ga ed wi h he amino acids glycine and au ine). La e , hey
a e exc e ed in o he duodenum o acili a e he diges ion and
abso p ion o lipophilic compounds, including die a y lipids,
a -soluble i amins, and choles e ol.
14
Mos conjuga ed
p ima y BAs a e eabso bed in he ileum excep o a small
ac ion, deconjuga ed by bile sal hyd olase p oduced by
diffe en in es inal BA-deconjuga ing bac e ia, which elease
deconjuga ed p ima y BAs. This deconjuga ed BA ac ion
eaches he colon, whe e CA and CDCA a e dehyd oxyla ed by
he in es inal BA-me abolising bac e ia in o DCA and li ho-
cholic acid LCA, espec i ely.
5,13,14
These seconda y BAs can be
u he ans o med un il e ia y BAs. UDCA, he mos
common e ia y bile acid, is p oduced om CDCA ia 7-ke o-
CDCA, whe eas iso-LCA is p oduced om CDCA ia LCA.
1
When add essing he possible effec o some die a y poly-
phenols, such as ETs, on BAs and choles e ol me abolism, he
Fig. 4 Spea man’s co ela ion hea maps o aecal BAs and s e ols wi h: (A) u oli hins ex ac ed om he aeces “F”and u ine “U”and (B) disc imi-
na ing bac e ia o PE consump ion and (C) se obiochemical a iables. *: Spea man’s co ela ion alues wi h P< 0.05.
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complexi y is u he inc eased due o he in e -indi idual
diffe ences in ETs and he hos ’s s e oid me abolism in lu-
enced by he gu mic obio a o each indi idual. Indeed, h ee
main UMs upon ET me abolism ha e been iden i ied in he
popula ion by a quali a i e c i e ion (i.e., p oduce s s. non-
p oduce s o speci ic U os), bu wi hin U o p oduce s (UM-A o
UM-B) also exis a U o p oduc ion g adien ha gi es ise o
highe and lowe U o p oduce s.
2,21
To da e, he effec s o ET-
ich p oduc s, including pomeg ana e, on he mic obial ans-
o ma ion o colonic BAs and choles e ol ha e no been
explo ed in dep h in humans, and he e is no in o ma ion
abou he ole o U os, UMs and hei associa ed gu mic o-
bio a in hese effec s.
In he p esen s udy, p ima y BAs and choles e ol concen-
a ion in he aeces did no diffe among UMs a baseline. In
con as , UM-B p esen ed he highes le els o o al BAs, sec-
onda y BAs and cop os anol, which we e s a is ically highe
han hose o UM-0 bu no hose o UM-A, which showed
in e media e mean le els compa ed o he o he wo UMs.
The e o e, lipid abso p ion capaci y, mic obial BA me abolism,
and gu cy o oxic isk could be augmen ed in UM-B o e -
weigh -obese subjec s, especially compa ed o UM-0, because
gu BAs p omo e abso p ion o lipids, including choles e ol, by
ac ing as emulsi ie s. Mo eo e , seconda y BAs a e conside ed
cy o oxic, esul ing in an inc eased isk o gu in lamma ion,
gu pe meabili y and colon cance .
12
In e es ingly, diffe ences
in he human gu mic obial ecologies associa ed wi h UMs
ha e been iden i ied, and cu en e idence sugges s ha he
UM-B g oup could be po en ially p one o gu
dysbiosis.
2,9–11,18,21,22
As p e iously epo ed,
10
he UM-B indi-
iduals o he p esen s udy we e also a highe ca dio ascula
isk since hei se um Tchol, LDLc, VLDLc, oxLDLc, ApoB,
non-HDLc, IDLc, and small and la ge LDLc le els we e highe
han hose in he UM-0 and UM-A g oups a he baseline. The
UM-A g oup showed in e media e mean le els compa ed o he
o he wo UM g oups.
Faecal and u ina y U o exc e ion by PE consump ion was
seen in U o p oduce s (UM-A o UM-B) wi h quali a i e and
quan i a i e diffe ences.
10
Acco dingly, in he p esen s udy,
we show he in e -indi idual diffe ences in U o-A p oduc ion
in bo h U o-p oducing me abo ypes (UM-A and UM-B) a e
3-week in ake o ou daily capsules o PE (Fig. 1). As p e-
iously epo ed,
10
u oli hin concen a ion is dose-dependen ly
inc eased (a ound 3.5- old) a e inc easing consump ion om
one o ou PE capsules. Also, h ee U o non-p oduce s (UM-0)
became p oduce s ollowing PE consump ion. No ably, PE
imp o ed some se um ca dio ascula isk ma ke s, bu only in
UM-B subjec s.
10
As p e iously desc ibed, he mos signi ican
quan i a i e in e se co ela ions be ween u ina y U os and
ca dio ascula ma ke s we e obse ed in UM-B indi iduals,
i.e., Tchol, LDLc, and non-HDLc nega i ely co ela ed wi h
u ina y U o-A exc e ion. In con as , LDLc also co ela ed wi h
u ina y IsoU o-A and U o-B.
10
Howe e , no signi ican co e-
la ions we e ound be ween aecal U o exc e ion and mos
ca dio ascula isk ma ke s. These esul s sugges ci cula ing
U os in plasma could be esponsible o he bene icial effec s
on ca dio ascula isk ma ke s and ag ee wi h p e ious s udies
in diffe en oden models mimicking ca diome abolic dis-
o de s, which desc ibed posi i e effec s in se obiochemical
pa ame e s a e o al and in ape i oneal adminis a ion o
U os as e iewed be o e.
2
Rega ding he e idence o he ca dio-
p o ec i e ac i i ies o U os in i o, se e al s udies epo ed
U o ac i i y on ca diomyocy es, mac ophages, hepa ocy es, and
adipocy es, as e iewed elsewhe e.
2
U os also signi ican ly
dec eased se um and hepa ic choles e ol, sugges ing he hypo-
lipidemic effec o U o-A and U o-B in a s.
23
In ha s udy,
U o-A and U o-B ea men s down egula ed he exp ession o
he li e X ecep o s (LXRα) and s e ol egula o y elemen
binding p o ein 1c (SREBP1c), in ol ed in de no o lipogen-
esis.
23
Howe e , whe he U os could also exe hei ca dio-
ascula and in es inal p o ec i e effec s indi ec ly h ough
modula ing he gu mic obio a in ol ed in ans o ming hos
me aboli es such as BAs and choles e ol has no been
explo ed.
The p esen s udy showed ha PE in ake in o e weigh -
obese olun ee s signi ican ly educed he aecal BA pool
(deconjuga ed-p ima y BAs, seconda y and e ia y BAs) and
cop os anol in all olun ee s be o e clus e ing and in he U o-
p oducing me abo ype subg oups (UM-A and UM-B), unlike
UM-0. Al hough he o al BA concen a ions in he UM-A and
UM-B g oups we e simila a e PE consump ion, he dec ease
was quan i a i ely mo e ema kable in he UM-B han in UM-A
indi iduals, since UM-B s a ed om highe concen a ions.
These o al BA educ ions we e mainly due o he la ge quan-
i a i e educ ion o seconda y BAs in he UM-B s. UM-A sub-
jec s since he dec ease o p ima y BAs was simila in bo h
UMs (Fig. 2). Acco dingly, he educ ion o DCA and LCA (sec-
onda y BAs) was quan i a i ely mo e ele an in he UM-B sub-
jec s s. he UM-A subjec s, whe eas CA and CDCA (p ima y
BAs) we e simila ly educed in he UM-A and UM-B g oups
(Fig. 2). In he UM-0 g oup (n= 6), hese educ ions we e also
obse ed in h ee (50%) o hem who became U o-A p oduce s
a e PE consump ion (da a no shown). The e o e, hese
educ ions we e no signi ican a e PE in ake in he
UM-0 g oup, which showed he lowes baseline BA and cop os-
anol concen a ions. Consequen ly, diffe ences among he
h ee UMs in he BA concen a ion disappea ed a e he PE
in e en ion (Fig. 2). Howe e , cop os anol le els we e s ill
highe in he UM-B g oup han in he UM-0 g oup a e he PE
in e en ion o 3 weeks (Fig. 2). The lack o effec s in he
UM-0 g oup could be due o only h ee o hem becoming U o-
A p oduce s a e PE consump ion.
10
Acco ding o his, when
all he olun ee s we e conside ed (n= 49), we obse ed a
quan i a i e in e se co ela ion o U o-A (a common me ab-
oli e o UM-A and UM-B) wi h he aecal BA pool (p ima y, sec-
onda y and e ia y BAs) and cop os anol. A p e ious s udy in
nasu in and U o-A-p oducing a s showed ha a high- a die
signi ican ly inc eased he concen a ion o BAs in he li e
and cecum. Howe e , hese high le els o BAs we e educed
a e supplemen ing he die s wi h ET- ich aspbe y
pomace.
24
The au ho s obse ed ha his supplemen a ion
ma kedly inc eased he exp ession le els o small he e odime
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pa ne 1 (SHP-1) associa ed wi h a nesoid-X- ecep o (FXR)
and educed he syn hesis o BAs in he li e , he eby educing
he gu BAs.
24
This aligns wi h he educ ion o p ima y BAs by
PE in ake obse ed in he p esen s udy. In addi ion o he
educ ion in he hepa ic p oduc ion o p ima y BAs, o he
s udies in animal models ha e also p o ed ha die a y pheno-
lic compounds can impac he mic obial me abolism o gu
BAs and choles e ol. Fo ins ance, a s showed lowe le els o
aecal seconda y BAs a e adminis e ing ea polyphenols and
gallo annins, and apple, g ape, and ed bee juices, as well as
cu cumin, caffeic acid, ca echin, u in, and ellagic acid, as
e iewed p e iously.
12
Howe e , a p e ious s udy epo ed no
educ ion in p ima y o seconda y BA con e sion, while chole-
s e ol me abolism o cop os anol was signi ican ly educed in
heal hy humans a e consuming pomeg ana e juice o ou
weeks.
25
Rega ding ha s udy,
25
he ma ginal changes
obse ed in BA me abolism by pomeg ana e juice in ake could
be due o he p esence o 25% UM-0 since no clus e ing by
UMs no quan i a i e co ela ions wi h U os exc e ion was
app oached, and all indi iduals we e conside ed a single
g oup. This a ionale aligns wi h p e ious s udies ha p opose
indi idual s a i ica ion acco ding o he polyphenol me ab-
olism capaci y o hei gu mic obio a o unde s and indi id-
uals’ esponse o die a y polyphenols.
26,27
We also obse ed a modula ion o he gu mic obio a abun-
dance by PE in all he olun ee s be o e clus e ing and in he
U o-p oducing me abo ype subg oups (UM-A and UM-B). PE
consump ion dec eased he abundance o Rombou sia, a BA-
deconjuga ing bac e ia in ol ed in he amino acid hyd olysis
p ocess om conjuga ed p ima y BAs, as well as he BA-me a-
bolising bac e ia in ol ed in p ima y BA me abolism o sec-
onda y and e ia y BAs such as Sa cina,Acine obac e ,
Collinsella and he amily Co iobac e iaceae.
3,28,29
Al hough
mic obial modula ion by PE was no iden ical in he UM-A and
UM-B g oups, some mic obial gene a in ol ed in BA me ab-
olism we e educed in bo h he g oups. In he UM-0 g oup (n=
6), he lack o gu mic obio a modula ion could be due o only
h ee olun ee s becoming U o-A p oduce s a e PE consump-
ion. Acco dingly, when all he olun ee s we e conside ed (n=
49), he ela i e abundance o hese bac e ia also co ela ed
nega i ely wi h he aecal U o-A le els and posi i ely wi h BAs,
especially seconda y and e ia y BAs. Acco ding o his, a p e-
ious s udy in a coli is a model showed ha U o-A o al
adminis a ion dec eased in lamma ion ma ke s and modu-
la ed he gu mic obio a a ou ably.
30
Ano he p e ious s udy
in hams e s has shown ha he p e alence o Co iobac e iaceae
is dependen on hos geno ype. Indeed, Co iobac e iaceae has
been posi i ely co ela ed wi h choles e ol abso p ion, ee
choles e ol in he li e , plasma non-HDLc, o al choles e ol,
li e weigh , and whi e adipose issue mass.
31
Fu he mo e,
his amily has been associa ed wi h suscep ibili y o ca ci-
nomas and umou de elopmen in a mu ine model
32
and
wi h UM-B in humans.
9
PE consump ion also inc eased some
bac e ial g oups, including he well-known bu y a e-p oducing
bac e ia (Odo ibac e and Dysosmobac e ) o p opiona e-p odu-
cing gene a (Phocaeicola),
33
which we e posi i ely associa ed
wi h he aecal U o-A le els. In e es ingly, Dysosmobac e wel-
bionis has been epo ed o p e en die -induced obesi y and
me abolic diso de s in mice.
34
Simila ly, a p e ious s udy con-
duc ed wi h a s showed ha U o-A and U o-B in ake imp o ed
li e and kidney unc ions and modula ed he gu mic obio a.
In pa icula , U o-A dec eased species di e si y and mic obial
ichness and nega i ely impac ed he composi ion o pa ho-
genic mic obes in no mal a s.
35
O e all, ou esul s sugges
ha U o-A (sha ed mic obial me aboli e be ween UM-A and
UM-B) is he main d i e o he PE effec s on he gu mic o-
bio a, and i is likely o impac BA p o iles in he hos , edu-
cing gu cy o oxici y and wi h po en ial consequences o lipid
me abolism and signalling. The p ecise ole o cop os anol
(also nega i ely co ela ed wi h U o-A p oduc ion) in he pa ho-
genesis o dyslipidemia emains elusi e. I dese es u he
esea ch o elucida e whe he cop os anol is a bioma ke ha
can also in luence he pa hogenesis o ca diome abolic dis-
eases and dyslipidemia.
36
Addi ionally, mo e esea ch is
needed o con i m he impac o U os in ake on he hos ’s
heal h and sa e y be o e being conside ed a possible ca dio-
ascula and gu cy o oxic p o ec o molecule.
Conclusions
Al hough he lipid-lowe ing effec o ET- ich oods in ca diome-
abolic diseases has been p e iously epo ed, i is unknown
whe he ETs and (o ) hei mic obial me aboli es U os exe
di ec ca diop o ec i e effec s in humans and (o ) indi ec ly
h ough modula ing he composi ion and unc ionali y o he
gu mic obio a, especially hose mic obes in ol ed in BA and
choles e ol me abolism. The o al numbe o mic obial species
and amilies engaged in hos choles e ol and BA ans o m-
a ions, hei me abolic pa hways, and he oles ha choles e ol
and BA mic obial me abolism play in hos heal h con inue o be
elucida ed. These aspec s a e o en unde app ecia ed as con i-
bu o s o s e ol- ela ed diseases. Ou esul s show ha PE in ake
educes gu mic obial me abolism o BAs and choles e ol and
modula es he gu mic obio a in an U o-A concen a ion-depen-
den manne . This sugges s ha U o-A could no only exe
di ec ca diop o ec i e effec s, bu also indi ec ly affec h ough
modula ing he composi ion and unc ionali y o he gu mic o-
bio a, including he educ ion o Co iobac e iaceae amily and
BA pool, which p omo e gu abso p ion o lipids. The ole ha
some polyphenols and de i ed mic obial me aboli es, such as
U os, may exe in he gu mic obial ecology associa ed wi h
s e oid me abolism highligh s he need o u he esea ch o
unde s and he complex in e play be ween die a y polyphenols,
hos BAs and s e ols, he gu mic obio a and mechanisms in he
hos ha egula e se um choles e ol le els.
Au ho con ibu ions
Concep ualiza ion and design: M. V. S. Expe imen execu ion:
A. C. M., C. E. I., A. M., and M. R. V. Me hodology and so -
Pape Food & Func ion
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