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Phytoene and Phytofluene Isolated from a Tomato Extract are Readily Incorporated in Mixed Micelles and Absorbed by Caco-2 Cells, as Compared to Lycopene, and SR-BI is Involved in their Cellular Uptake

Abstract

Scope: Absorption mechanisms of phytoene (PT) and phytofluene (PTF) are poorly known. The main objectives of the study are to measure their micellization and intestinal cell uptake efficiencies and to compare them to those of commonly consumed carotenoids. Other objectives are to assess the involvement of protein(s) in their cellular uptake and whether they compete with other carotenoids for micellization and cellular uptake. Methods and results: Tomato-extract-purified PT and PTF, mainly present as cis-isomers, are much better incorporated in synthetic mixed micelles than pure all-trans lycopene. PT impairs lycopene micellization (−56%, P < 0.05) while PT and PTF do not significantly affect the micellization of other carotenoids, and vice versa. At low concentration, Caco-2 PTF uptake is higher (P < 0.05) than that of PT and lycopene (29%, 21%, and not detectable). SR-BI, but not CD36 neither NPC1L1, is involved in PT and PTF uptake. PT and PTF impair (p < 0.05) β-carotene uptake (−13 and −22%, respectively). Conclusions: The high bioaccessibility of PT and PTF can be partly explained by their high micellization efficiency, which is likely due to their natural cis isomerization and/or to their high molecular flexibility. SR-BI is involved in their cellular uptake, which can explain competitions with other carotenoids.

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Phytoene and Phytofluene Isolated from a Tomato Extract are Readily Incorporated in Mixed Micelles and Absorbed by Caco-2 Cells, as Compared to Lycopene, and SR-BI is Involved in their Cellular Uptake

Author: Mapelli Brahm, Paula; Desmarchelier, Charles; Margier, Marielle; Reboul, Emmanuelle; Meléndez Martínez, Antonio Jesús; Borel, Patrick
Publisher: Wiley-Blackwell
Year: 2018
DOI: 10.1002/mnfr.201800703
Source: https://idus.us.es/bitstreams/a92ff2d0-595e-4f59-8b6f-7770a96569eb/download
RESEARCH ARTICLE
Ca o enoids www.mn -jou nal.com
Phy oene and Phy ofluene Isola ed om a Toma o Ex ac
a e Readily Inco po a ed in Mixed Micelles and Abso bed by
Caco-2 Cells, as Compa ed o Lycopene, and SR-BI is
In ol ed in hei Cellula Up ake
Paula Mapelli-B ahm, Cha les Desma chelie , Ma ielle Ma gie , Emmanuelle Reboul,
An onio J. Mel´
endez Ma ´
ınez, and Pa ick Bo el*
Scope: Abso p ion mechanisms o phy oene (PT) and phy ofluene (PTF) a e
poo ly known. The main objec i es o he s udy a e o measu e hei
micelliza ion and in es inal cell up ake efficiencies and o compa e hem o
hose o commonly consumed ca o enoids. O he objec i es a e o assess he
in ol emen o p o ein(s) in hei cellula up ake and whe he hey compe e
wi h o he ca o enoids o micelliza ion and cellula up ake.
Me hods and esul s: Toma o-ex ac -pu ified PT and PTF, mainly p esen as
cis-isome s, a e much be e inco po a ed in syn he ic mixed micelles han
pu e all- ans lycopene. PT impai s lycopene micelliza ion (−56%, P<0.05)
while PT and PTF do no significan ly affec he micelliza ion o o he
ca o enoids, and ice e sa. A low concen a ion, Caco-2 PTF up ake is highe
(P<0.05) han ha o PT and lycopene (29%, 21%, and no de ec able).
SR-BI, bu no CD36 nei he NPC1L1, is in ol ed in PT and PTF up ake. PT
and PTF impai (p<0.05) β-ca o ene up ake (−13 and −22%, espec i ely).
Conclusions: The high bioaccessibili y o PT and PTF can be pa ly explained
by hei high micelliza ion efficiency, which is likely due o hei na u al cis
isome iza ion and/o o hei high molecula flexibili y. SR-BI is in ol ed in
hei cellula up ake, which can explain compe i ions wi h o he ca o enoids.
1. In oduc ion
Phy oene (PT) and phy ofluene (PTF) a e ca o enes, i.e., non-
oxygena ed ca o enoids, which a e ound in a wide a ie y o
ui s and ege ables, e.g., in oma oes, ca o s, and ligh o -
ange ap ico s (a concen a ions o a ound 1.4 and 0.4; 1.4 and
0.6; and 7.2 and 2.4 mg/100 g edible po ion, o PT and PTF,
P. Mapelli-B ahm, D . A. J. Mel´
endez Ma ´
ınez
Food Colou & Quali y Lab.
A ea o Nu i ion & Food Science
Uni e sidad de Se illa
41012, Se ille, Spain
D .C. Desma chelie , M. Ma gie , D . E. Reboul, D . P. Bo el
C2VN, Aix Ma seille Uni , INRA, INSERM
Ma seille, F ance
E-mail: [email p o ec ed]
DOI: 10.1002/mn .201800703
espec i ely).[1,2] These ca o enoids con-
ain h ee (PT) and fi e (PTF) conju-
ga ed double bonds (CDB), while com-
monly consumed ca o enoids con ain a
leas en CDB (Figu e S1, Suppo ing In-
o ma ion). This p o ides hem wi h a
unique ea u e in he ca o enoid king-
dom: hey do no abso b isible ligh and
hus a e colo less o human.[3] In addi-
ion, hei lowe numbe o CDB gi es
hem a mo e wis ed shape compa ed
o commonly consumed ca o enoids,[4,5]
which has been sugges ed o affec hei
bioa ailabili y and biological ac ions.[2]
Mo eo e , i could also be expec ed ha
hei endency o oxida ion would be
lowe .[2]
PT and PTF a e eadily abso bed by
he human body, being ound in blood
and se e al issues.[6,7] They ha e ecen ly
ecei ed inc eased in e es because se -
e al s udies ha e ound posi i e associa-
ions be ween hei consump ion/blood
concen a ion and some heal h benefi s.
The in ake o PT and/o PTF could be
ela ed o an imp o emen o he immune sys em and a educ-
ion in he isk o de elop a ious diseases, including ce ain
cance s.[2,8,9] Mo eo e , se e al s udies ha e indica ed ha hey
could p o ec he skin agains UV-damage and p o ide cosme ic
benefi s.[10–13]
To each he bloods eam and hen a ge issues, ca o enoids
mus fi s be eleased om he ood ma ix in which hey a e
embedded and be inco po a ed in o mixed micelles.[14,15] PT and
PTF ha e been shown o exhibi highe bioaccessibili y han o he
ca o enoids p esen in he same ood ma ices.[16–19] Indeed, a
bioaccessibili y anking o ca o enoid species seems o eme ge
ega dless o he ood ma ix: PT and PTF >lu ein >β-ca o ene
>lycopene. Howe e , a ailable da a do no allow us o conclude
whe he he high bioaccessibili y o PT and PTF o igina es om
a highe ex ac ion efficiency om ood ma ices, due o spe-
cific in acellula localiza ion compa ed o o he ca o enoids,[20]
o om a highe in insic solubili y in mixed micelles,[21] due o
hei peculia chemical and physical p ope ies, o bo h. Once in
mixed micelles, i is assumed ha PT and PTF a e aken up by
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en e ocy es, anspo ed o hei basola e al side, and inco -
po a ed in o chylomic ons be o e being sec e ed in o he
lymph.[14,15,22] These up ake and anspo p ocesses a e appa -
en ly e y efficien o he colo less ca o enoids because, e.g., PT
is a majo ca o enoid in a ious issues and i s bioa ailabili y
has been shown o be nea ly iple han ha o lycopene.[23] Ye ,
hei in es inal abso p ion mechanisms ha e no been s udied
and compa ed o hose o commonly s udied ca o enoids. Ne -
e heless, s udies in he las decade ha e allowed expe s in his
field o conclude ha en e ocy e up ake o commonly consumed
ca o enoids is no only passi e bu acili a ed by memb ane
p o eins.[24–27] Indeed, i has been shown ha CD36 molecule
(CD36) is in ol ed in cell up ake o p o i amin A ca o enoids[24]
and lu ein,[28] sca enge ecep o class B ype I (SR-BI) is in ol ed
in cell up ake o p o i amin A ca o enoids,[24,29] lycopene,[28] and
lu ein,[26] and NPC1 like in acellula choles e ol anspo e 1
(NPC1L1) is in ol ed in lu ein up ake.[30,31] Ye , i is no known
whe he any o hese p o eins a e in ol ed in cell up ake o he
colo less ca o enoids.
Ou main objec i e was o ob ain undamen al da a on wo
key s eps ha a e assumed o go e n he bioa ailabili y o he
colo less ca o enoids, i.e., micelliza ion and apical up ake by in-
es inal cells. Fo ha , we fi s measu ed he inco po a ion effi-
ciency o oma o ex ac pu ified PT and PTF in syn he ic mixed
micelles and compa ed i o ha o pu e commonly consumed
ca o enoids. We nex assessed whe he p e iously men ioned
p o eins in ol ed in up ake o commonly consumed ca o enoids
we e also in ol ed in ha o hese colo less ca o enoids. Finally,
because hese colo less ca o enoids migh be used as supple-
men s in he u u e, we assessed in all expe imen s whe he hey
compe e wi h he s udied commonly consumed ca o enoids.
2. Expe imen al Sec ion
2.1. Chemicals
PT and PTF (99.6 and 99.8% pu e as checked by HPLC) we e
isola ed om a oma o ex ac as desc ibed p e iously.[19] Pu-
ified PT con ained 96% o 15-cis-isome and 4% o all- ans-
isome and pu ified PTF con ained 94% o cis-isome s and
6% o all- ans-isome . No e ha in mos oods, human is-
sues, and biological fluids, PT and PTF a e expec ed o be
p esen as a mix u e o isome s, he cis isome s assumed o
be p edominan .[5,32] All- ans α-ca o ene, lycopene, and lu ein
(ࣙ95% pu e) we e a gi om DSM L d. (Basel, Swi ze -
land). All- ans β-ca o ene (ࣙ97% pu e), 2-oleoyl-1-palmi oyl-
sn-glyce o-3-phosphocholine (phospha idylcholine), 1-oleoyl- ac-
glyce ol (monoolein), 1-palmi oyl-sn-glyce o-3-phosphocholine
(lysophospha idylcholine), 3β-hyd oxy-5-choles ene ( ee choles-
e ol), oleic acid, and sodium au ochola e we e pu chased om
Sigma–Ald ich (Sain -Quen in-Falla ie , F ance). DMEM con-
aining 4.5 g L−1glucose, ypsin-EDTA (500 and 200 mg L−1,
espec i ely), nonessen ial amino acids, penicillin/s ep omycin,
and PBS we e pu chased om Li e Technologies (Illki ch,
F ance). Fe al bo ine se um (FBS) came om PAA (V´
elizy-
Villacoublay, F ance). Block lipid anspo -1 (BLT1), used as
chemical inhibi o o SR-BI, was pu chased om Sigma–
Ald ich. Eze imibe β-d-glucu onide, used as chemical inhibi o
o NPC1L1, was pu chased om Sequoia-Resea ch (Pangbou ne,
UK). Sul o-N-succin-imidyl olea e (SSO), used as chemical in-
hibi o o CD36, was syn hesized as p e iously published.[33]
2.2. P epa a ion o Ca o enoid-Rich Mixed Micelles
Mixed micelles con aining ca o enoids we e syn hesized as p e-
iously desc ibed,[34] wi h mino modifica ions. In summa y, sol-
en solu ions o ca o enoids we e fi s mixed wi h sol en so-
lu ions o micelle lipids and hen he mix u e was e apo a ed.
Then, DMEM con aining 5 mm sodium au ochola e was added
and mixed micelles we e syn hesized by sonica ion. The mixed
micelle ac ion was op ically clea and s o ed a −20 °C un il
Caco-2 cell expe imen s.
2.3. Micelliza ion Expe imen s
2.3.1. Measu emen o Ca o enoid Micelliza ion
The amoun o ca o enoids ha could be inco po a ed in he
mixed micelle ac ion was measu ed a h ee a ge ca o enoid
concen a ions, 0.5, 2, and 10 µm. These concen a ions a e ex-
pec ed o be ound in he human in es inal lumen a e ei he
low die a y, high die a y, o pha macological in ake o hese
ca o enoids. They we e es ima ed om a p e ious wo k[19] whe e
ca o enoid concen a ions we e measu ed in gas o-in es inal
fluid ollowing in i o diges ions o diffe en doses o hese com-
pounds.
2.3.2. P o ocol o S udy Compe i ions be ween Ca o enoids o
Micelliza ion
To s udy his compe i ion, he amoun o ca o enoid eco e ed
in mixed micelles was compa ed when only one ca o enoid was
added a 0.5 µm du ing mixed micelle syn hesis (con ol) o he
ca o enoid amoun eco e ed in micelles when 0.5 µm o ano he
ca o enoid was added o he p e ious one du ing mixed micelle
syn hesis.
2.4. Caco-2 Cell Expe imen s
2.4.1. Cul u e o Caco-2 Cells
Caco-2 clone TC-7 cells we e a gi om D . M. Rousse (UMR-
S872, Pa is, F ance). Cells we e hawed a passage numbe 70
o highe and we e cul u ed as p e iously desc ibed.[26] Be o e
3 weeks o each expe imen , he cells we e seeded on Millicell
hanging cell cul u e inse s (1 µm po e size polyca bona e mem-
b ane, Millipo e S.A.S., Molsheim, F ance) in six-well pla es a a
densi y o 25 ×104cells pe well o allow o diffe en ia ion. Be-
o e 12 h o each expe imen , media we e changed o FBS- ee
medium a bo h sides. Based on p elimina y esul s (Figu e S2,
Suppo ing In o ma ion) and unless o he wise s a ed, an incuba-
ion ime o 2 h was selec ed o he ollowing Caco-2 cells expe -
imen s.
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2.4.2. P o ocol o E alua e he Maximal Amoun o Micella PT and
PTF ha could be Theo e ically Taken Up by Caco-2 Cells
The apical side o Caco-2 cell monolaye s ecei ed diffe en con-
cen a ions o micella PT and PTF, mo e p ecisely om 0.3 o
6.9 µm. The amoun o PT and PTF aken up by he cells was mea-
su ed a he end o he incuba ion ime (2 h). Qmax, which is he
maximal amoun o ca o enoid ha could be heo e ically aken
up by he cells, and appa en K, which is he micella ca o enoid
concen a ion a which up ake is hal he Qmax, we e calcula ed.
2.4.3. Compa ison o Up ake o Diffe en Ca o enoid Species by
Caco-2 Cells
Pu ified 0.5 µm PT o PTF, o pu e lu ein, lycopene, o β-ca o ene
was inco po a ed in mixed micelles and added o he apical side
o Caco-2 cells monolaye s. The amoun o ca o enoids aken up
by he cells was measu ed a e 2 h incuba ion.
2.4.4. Compe i ions be ween Micella Ca o enoids o hei Up ake
by Caco-2 Cells
Cells we e incuba ed wi h mixed micelles con aining one
ca o enoid oge he wi h mixed micelles con aining ei he no
ca o enoid (con ol) o ano he ca o enoid. These expe imen s
we e ca ied ou wi h micella ca o enoid concen a ions o abou
1µm.
2.4.5. Apical Efflux o Micella PT and PTF by Caco-2 Cells
Apical efflux was assessed as p e iously desc ibed.[34] Fi s , he
apical side o he cells was incuba ed du ing 4 h wi h ca o enoid-
ich mixed micelles ha con ained a ound 10 µm ca o enoids.
Cells we e hen washed wi h PBS and incuba ed o 15 min wi h
FBS- ee medium. Las ly, cells we e incuba ed du ing 30, 60, o
120 min wi h ca o enoid- ee mixed micelles a he apical side
and he amoun o ca o enoid eco e ed in he apical medium
was measu ed.
2.4.6. Effec o NPC1L1 and SR-BI Chemical Inhibi o s on micella
PT and PTF Up ake by Caco-2 Cells
Cells we e fi s p e-incuba ed wi h ei he 10 µmDMSO(con ol)
o 10 µm o he co esponding chemical inhibi o (eze imibe glu-
cu onide o NPC1L1 o BLT1 o SR-BI) o 1 h. The apical side
hen ecei ed 1 mL o ca o enoid- ich mixed micelles (a 1.4 µm
o PT o 1.2 µm o PTF) supplemen ed wi h ei he 10 µmDMSO
(con ol) o 10 µm o he co esponding chemical inhibi o while
he basola e al side ecei ed FBS- ee medium. The cellula up-
ake o ca o enoids was measu ed a e 2 h incuba ion.
2.5. HEK Cell Cul u e Expe imen s
To confi m p e ious esul s ob ained on he p o ein appa en ly
in ol ed, o no , in PT and PTF up ake by Caco-2 cells, and
o u he assess he po en ial in ol emen o CD36, which is
no exp essed in Caco-2 TC-7 cells,[35] up ake s udies in G ipTi e
cells, i.e., gene ically enginee ed Human Emb yonic Kidney cells
(HEK 293-T cells), we e pe o med.
HEK cells we e cul u ed and ans ec ed as p e iously
desc ibed.[24] Fo ans ec ion, 3 µg o DNA was used, i.e., emp y
pIRES plasmid o human CD36 in pIRES plasmid o s udy
he in ol emen o CD36; and emp y pCDNA3.1 plasmid o
human SCARBI in pCDNA3.1 plasmid o s udy he in ol e-
men o SR-BI. The ans ec ions we e checked by Wes e n blo
analysis.[33]
Ca o enoids in mixed micelles we e no used in hese ex-
pe imen s because bile sal s exe oxic effec s on HEK cells.
The e o e, he ca o enoids ehicles we e p epa ed as ollows:
fi s , ca o enoids in hexane we e inco po a ed in a glass ube
and, a e e apo a ion o he sol en , 6 µL o e hanol we e
added o acili a e he subsequen solubiliza ion o ca o enoids
in FBS. Then, 1.2 mL o FBS and 10.8 mL o DMEM we e
added and he final mix u e was o exed and sonica ed o wo
min.
Be o e each expe imen , ca o enoid concen a ion in he com-
ple e medium was analyzed by HPLC. Th ee condi ions we e
es ed: 1) HEK cells ans ec ed wi h he emp y plasmid (con-
ol condi ion), 2) HEK cells ans ec ed wi h a plasmid con ain-
ing ei he SCARB1, which encodes o SR-BI, o CD36,and3)
HEK cells ans ec ed wi h a plasmid con aining ei he SCARB1
o CD36 oge he wi h an inhibi o o he co esponding p o ein
(BLT1 a 10 µm o SSO a 400 µm,[36] espec i ely). Thus, he cells
ecei ed 1 mL o comple e medium in which 5 µm o ei he PT
o PTF was added, supplemen ed wi h ei he DMSO o he fi s
and second condi ions, o wi h he co esponding inhibi o o
he hi d condi ion. A e 3 h o incuba ion, ca o enoid concen-
a ion was measu ed in he media and he sc aped cells.
2.6. Ca o enoid Ex ac ion and HPLC Analysis
Ca o enoid ex ac ion was ca ied ou as p e iously desc ibed,[33]
using α-ca o ene as an in e nal s anda d. Ca o enoid ex ac s
we e e-dissol ed in 100 µL o e hyl ace a e and 10–80 µL we e
injec ed. HPLC analyses we e ca ied ou on a Dionex sys em,[37]
using a YMC-C30 column (5 µm, 4.6 ×250 mm) kep a 30 °C
wi h a YMC-C30 p e-column (5 µm, 10 ×4 mm). The mobile
phase consis ed o a mix u e o me hanol and me hyl e -bu yl
e he wi h an elu ion g adien ha was desc ibed p e iously.[37]
The quan ifica ion was pe o med by conside ing he da a ex-
ac ed a 286 (PT), 350 (PTF), 450 (β-ca o ene, lu ein, and α-
ca o ene), and 470 nm (lycopene), using Ch omeleon so wa e
( e sion 6.50 SP4 Build 1000, Dionex) and ex e nal calib a ion
cu es.
2.7. Calcula ions and S a is ics
Ca o enoid up ake efficiency by cells was exp essed as he pe -
cen age o ca o enoids eco e ed in he sc aped cells a he end
o he expe imen s ela i e o he sum o ca o enoids eco -
e ed in he apical chambe plus hose eco e ed in he sc aped
cells.
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Table 1. Pa ame e s o phy oene and phy ofluene up ake by Caco-2 cells.
Ca o enoid Appa en Qmax (nmol) Appa en K(µm) R2
Phy oene 3.17 ±0.05a13.67 ±0.35a1.000
Phy ofluene 0.53 ±0.04b1.44 ±0.25b0.997
Caco-2 clone TC-7 cells we e hawed a passage numbe 67. Th ee weeks be o e each
expe imen , he cells we e seeded on cul u e inse s (1 µm po e size polyca bona e
memb ane) in six-well pla es a a densi y o a ound 25 ×104cells pe well o allow o
diffe en ia ion. Twel e hou s be o e each expe imen , media we e changed o FBS-
ee medium a bo h sides. Cells ecei ed 1 mL o ca o enoid- ich syn he ic mixed
micelles a a ound 0.5 µM on he apical side. Ca o enoid up ake was measu ed a e
2 h incuba ion. Resul s a e shown in Figu e 1B. Bes fi ing cu es we e hype bolic
ones: y=ax/(b +x). Appa en Qmax ep esen s he maximal amoun o ca o enoid
ha could be aken up by cells. Appa en Kis he micella ca o enoid concen a ion
a which he amoun aken up is hal he Qmax. Values ep esen means ±SEM o
h ee eplica es. Mean alues wi h unlike supe sc ip le e s wi hin a column we e
significan ly diffe en (p<0.05).
Table 2. Ca o enoid up ake by Caco-2 cells a a micella concen a ion co -
esponding o a low die a y in ake o ca o enoids.
Ca o enoid Up ake (%)
Phy oene 20.8 ±0.6b
Phy ofluene 28.9 ±1.2a
β-Ca o ene 30.6 ±0.7a
Lu ein 25.8 ±2.1ab
Caco-2 clone TC-7 cells we e hawed a passage numbe 92. Th ee weeks be o e each
expe imen , he cells we e seeded on cul u e inse s (1 µm po e size polyca bona e
memb ane) in six-well pla es a a densi y o abou 25 ×104cells pe well o allow o
diffe en ia ion. Twel e hou s be o e each expe imen , media we e changed o FBS-
ee medium a bo h sides. Cells ecei ed 1 mL o ca o enoid- ich syn he ic mixed
micelles a a ound 0.5 µm on he apical side. Ca o enoid up ake was measu ed a e
2 h incuba ion. Values ep esen mean ±SEM o h ee eplica es. Lycopene up ake
could no be accu a ely measu ed because i was lowe han he HPLC de ec ion limi .
Mean alues wi h unlike supe sc ip le e s we e significan ly diffe en (p<0.05).
Ca o enoid efflux efficiency by cells was calcula ed as he ela-
i e amoun o ca o enoid eco e ed in he apical medium a he
end o he expe imen compa ed o ha measu ed in he cells
a e 4 h incuba ion.
When micelliza ion and up ake expe imen s we e done using
he same mixed micelles han hose used o measu e ca o enoid
micelliza ion, he pe cen age o heo e ical bioa ailabili y o a
ca o enoid was calcula ed as: micelliza ion efficiency (%) ×up-
ake efficiency (%).
All expe imen s we e done in iplica e, excep hose o s udy
he implica ion o SR-BI and NPC1L1 in he up ake o PT and
PTF by Caco-2 cells, which we e pe o med on wo diffe en days
and included ou eplica es pe day. Resul s a e exp essed as
mean ±SEM.
S a is ical analyses we e pe o med using SPSS ( e sion 20,
SPSS Inc., Chicago, IL, USA) s a is ical package. Be o e S u-
den ’s - es o ANOVA, homogenei y o a iances was checked by
Le ene’s es and no mali y o dis ibu ions by Q-Q plo s. When
he F- es in ANOVA was significan , Tukey’s es was used as a
pos hoc es o pai wise compa isons, bu Dunne ’s es was
used when compa ing means om se e al expe imen al g oups
agains a single con ol g oup mean. Fo all es s, he bila e al
alpha isk was α=0.05.
Rela ionships be ween wo con inuous a iables we e exam-
ined by eg ession analysis on KaleidaG aph so wa e ( e sion
3.6, Syne gy so wa e, Reading, PA).
3. Resul s
3.1. Inco po a ion Efficiency o PT and PTF in Syn he ic Mixed
Micelles as Compa ed o ha o Commonly Consumed
Ca o enoids
Ma ked diffe ences in inco po a ion efficiency o he in es iga ed
ca o enoids we e obse ed (Figu e 1A). PT and lu ein displayed
he highes inco po a ion efficiencies, which we e linea o e
he h ee concen a ions es ed. PTF inco po a ion efficiency was
simila o ha o PT and lu ein up o abou 2 µm, i.e., high die a y
concen a ions, bu hen i appa en ly s a ed o pla eau when
he concen a ion inc eased. Lycopene exhibi ed he lowes in-
co po a ion efficiency wi h a maximum micella concen a ion
o 0.06 µm a all h ee concen a ions es ed.
3.2. Compe i ion be ween Colo less Ca o enoids and O he
Ca o enoids o Micelliza ion
Nei he did PT o PTF compe e o hei micelliza ion when hey
we e added concu en ly a 0.5 µm du ing mixed micelle syn he-
sis. The addi ion o 0.5 µm PTF du ing mixed micelle syn he-
sis did no significan ly impai lu ein o lycopene micelliza ion.
Conce ning PT, i s addi ion did no significan ly impai lu ein
micelliza ion whe eas i significan ly (p<0.05) impai ed ha o
lycopene (−55.6%). Finally, he inco po a ion efficiencies o PT
and PTF we e no significan ly affec ed by he simul aneous addi-
ion o lu ein, β-ca o ene, o lycopene du ing mixed micelle syn-
hesis (da a no shown).
3.3. Effec o he Concen a ion o Micella PT and PTF on hei
Up ake Efficiency by Caco-2 Cells
PT and PTF up ake by Caco-2 cells as a unc ion o hei micella
concen a ion ollowed hype bolic cu es (Figu e 1B). Thus, hei
up ake efficiency dec eased when hei micella concen a ion in-
c eased. Mo e p ecisely, PT up ake efficiency dec eased om 23.4
o 14.6% (a 0.3 and 6.9 µm, espec i ely) and ha o PTF om
32.0 o 14.8% (a 0.4 and 2.2 µm, espec i ely). Calcula ed Qmax
and Ko PT we e almos six- and en old highe han ha o PTF,
espec i ely (Table 1).
3.4. Compa ison o Ca o enoid Up ake by Caco-2 Cells
The up ake efficiency o lu ein, β-ca o ene, and PTF was no sig-
nifican ly diffe en (p=0.121). Con e sely, PT up ake efficiency
was significan ly lowe han ha o PTF and β-ca o ene (Table 2).
The up ake o lycopene was oo low o be accu a ely measu ed
and was he e o e ma kedly lowe han ha o he o he s udied
ca o enoids.
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Figu e 1. Cha ac e iza ion o phy oene and phy ofluene micelliza ion and up ake by Caco-2 cells. A) Inco po a ion o phy oene, lu ein, phy ofluene, and
lycopene in syn he ic mixed micelles. Mixed micelles wi h a ying concen a ions o pu e ca o enoids we e syn hesized and hei ca o enoid concen a ion
was measu ed by HPLC. Linea end lines: Phy oene: y=0.874x(R2=0.999); lu ein: y=0.823x(R2=0.999). Cu ilinea end lines: Phy ofluene:
y=−0.0734x2+0.899x(R2=1.000); lycopene: y=−0.0008x2+0.0137x(R2=0.836). B) Effec o micella phy oene and phy ofluene concen a ions
on hei up ake by Caco-2 cells. The apical side o he cells ecei ed mixed micelles ha con ained diffe en concen a ions o phy oene and phy ofluene.
Basola e al side ecei ed FBS- ee medium. Ca o enoid concen a ions we e measu ed in sc aped cells a e 2 h incuba ion. The bes -fi cu es we e
hype bolic ones: y=ax/(x+b). Values ep esen means o h ee eplica es and e o ba s indica e s anda d e o o he mean.
3.5. Compe i ions be ween Micella Ca o enoids o hei Up ake
by Caco-2 Cells
The effec o he addi ion o ei he micella PT o PTF on he cel-
lula up ake o commonly consumed ca o enoids is shown in Fig-
u e 2A and B. Micella lu ein up ake was no significan ly affec ed
by he addi ion o ei he micella PT o PTF (Figu e 2A). Con-
e sely, micella β-ca o ene up ake was significan ly impai ed by
PT and PTF (–12.9 and –21.6%, espec i ely) (Figu e 2B). The
effec o he addi ion o ei he micella PT o PTF on lycopene
up ake is no shown because i could no be accu a ely measu ed
due o he e y low amoun o lycopene aken up by he cells.
The effec o he addi ion o he o he s udied ca o enoids on
PT and PTF up ake by Caco-2 cells is shown in Figu e 2C and D.
The up ake o micella PT was significan ly impai ed when micel-
la PTF, β-ca o ene, o lu ein we e added in he apical chambe
(−30.8, −52.4, and −27.8%, espec i ely, p<0.001; Figu e 2C).
Con e sely, only micella lu ein significan ly impai ed micella
PTF up ake (–40%, p<0.001) (Figu e 2D).
3.6. Apical Efflux o PT and PTF by Caco-2 Cells
The apical efflux o PT and PTF ollowing hei apical up ake
was no significan ly diffe en , i.e., a ound 14 ±2% o bo h
ca o enoids (p=0.649), and i did no significan ly a y om 30
o 120 min (da a no shown).
3.7. Effec o NPC1L1 and SR-BI Chemical Inhibi o s on Micella
PT and PTF Up ake by Caco-2 Cells
Eze imibe glucu onide, a chemical inhibi o o NPC1L1, did no
significan ly affec PT o PTF up ake (Figu e 3A). Con e sely,
up ake o PT and PTF was significan ly dec eased (−76.9 and
−85.4%, espec i ely, p<0.001) when BLT1, a chemical inhibi o
o SR-BI was added o he apical medium.
3.8. Effec o T ans ec ion o Memb ane P o eins on Micella PT
and PTF Up ake by HEK Cells
PT and PTF up ake was significan ly highe in HEK cells
ans ec ed wi h SCARB1, which encodes o SR-BI, han
in HEK cells ans ec ed wi h an emp y plasmid (p<0.01
and p<0.05 o PT and PTF, espec i ely). Fu he mo e,
he addi ion o BLT1 o he SCARB1 ans ec ed cells led
o abolish he highe up ake obse ed in hese cells (Fig-
u e 3B). In addi ion, ans ec ion o HEK cells wi h CD36 did
no significan ly change hei PT and PTF up ake efficiency
(da a no shown).
4. Discussion
This s udy was based on he hypo hesis ha he high bioa ail-
abili y o PT and PTF ela i e o ha o o he ca o enoids ound
in he same ood ma ices is due, a leas in pa , o hei peculia
molecula p ope ies, which could lead o highe solubili y in
mixed micelles and/o o highe up ake efficiency by in es inal
cells. To e i y his hypo hesis, we fi s pu ified PT and PTF
om oma o ex ac and we compa ed hei micelliza ion
and hei cellula up ake efficiency o ha o pu e commonly
consumed ca o enoids. We obse ed ha PT and PTF possess
a much highe in insic abili y o be inco po a ed in o syn he ic
mixed micelles han lycopene, ano he linea non-oxygena ed
ca o enoid. In ac , a low and high die a y concen a ions, i.e.,
0.5 and 2.0 µm, hei micelliza ion efficiency was simila o ha o
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Figu e 2. Compe i ions be ween micella ca o enoids o hei up ake by Caco-2 cells. A) Effec o phy oene and phy ofluene on lu ein up ake. B) Effec
o phy oene and phy ofluene on β-ca o ene up ake. C) Effec o phy ofluene and commonly consumed ca o enoids on phy oene up ake. D) Effec o
phy oene and commonly consumed ca o enoids on phy ofluene up ake. The apical side o he cells ecei ed 1 mL o mixed micelles ha con ained
he ca o enoid o in e es plus ei he ca o enoid- ee mixed micelles (con ol) o mixed micelles loaded wi h ano he ca o enoid species. The a ge
micella concen a ion o each ca o enoid in each compe i ion condi ions was 1 µm. Ca o enoid up ake was measu ed a e 2 h incuba ion. The effec
o phy oene and phy ofluene on lycopene up ake could no be accu a ely measu ed because lycopene up ake was oo low o be accu a ely measu ed in
ou expe imen al condi ions. Values ep esen mean o h ee eplica es and e o ba s indica e SEM. As e isks indica e significan diffe ences om he
con ol (abso p ion o he ca o enoid o in e es alone): *p<0.05; ***p<0.001.
Figu e 3. Implica ion o NPC1L1 and SR-BI on phy oene and phy ofluene up ake by cells. A) Effec o chemical inhibi o s o NPC1L1 and SR-BI on
phy oene and phy ofluene up ake by Caco-2 cells. Cell apical sides we e p e-incuba ed o 1 h wi h ei he 10 µmDMSO(con ol)o 10µM chemical
inhibi o (eze imibe glucu onide o NPC1L1 o BLT1 o SR-BI). Apical sides ecei ed he ea e phy oene- o phy ofluene-loaded syn he ic mixed micelles
a 1.4 and 1.2 µm, espec i ely. Ca o enoid up ake was assessed a e 2 h incuba ion. The expe imen was ca ied ou wice, wi h 4 eplica es in each
case. This figu e shows esul s o one expe imen . As e isks indica e significan diffe ences om he con ol (***p<0.001). B) Effec o ans ec ion o
HEK cells wi h SR-BI gene and u he addi ion o SR-BI chemical inhibi o on phy oene and phy ofluene up ake by hese cells. Cells we e fi s ans ec ed
wi h ei he an emp y plasmid (con ol) o a plasmid con aining SCARB1, i.e., he gene encoding he SR-BI p o ein. Then cells ecei ed comple e medium
en iched wi h ei he micella phy oene o phy ofluene a 5 µm, supplemen ed o no wi h 10 µm DMSO o BLT1 ( he chemical inhibi o o SR-BI).
Incuba ion ime was 3 h. Fo each ca o enoid ba s bea ing unlike supe sc ip le e s a e significan ly diffe en (p<0.05). In each figu e, alues ep esen
means o h ee eplica es and e o ba s indica e SEM.
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lu ein, which is an oxygena ed ca o enoid acknowledged o ha e
a highe micelliza ion efficiency compa ed o ca o enes.[38,39] We
hypo hesize ha his high in insic solubili y in mixed micelles
is due ei he o he ac ha PT and PTF we e mainly p esen in
he o m o cis-isome s, which is simila o hei isome iza ion
s a us in oods, and/o o he ac ha hese ca o enoids ha e a
highe molecula flexibili y han he o he s udied ca o enoids.
Conce ning he fi s hypo hesis, al hough i is no known
whe he he cis-isome s o PT and PTF ha e highe solubili y in
micelles han hei espec i e all- ans isome s, we hypo hesize
ha his is e y likely because his has been shown o ano he
linea ca o ene, i.e., lycopene.[39–41] Conce ning he second
hypo hesis, i has been shown ha , due o hei lowe numbe
o CDB (Figu e S1, Suppo ing In o ma ion), PT and PTF can
old mo e eely and adop less igid shapes han commonly
consumed ca o enoids.[32] Fu he mo e, he highe numbe o
sigma bonds in hese molecules, whe e o a ion is possible,[42]
leads o a mo e p onounced wis in he backbone o hese
molecules.[4,5] In ac , o sional ene gies o he linea ca o enoids
in es iga ed ank as ollows: PT (ࣈ57 kcal mol−1,3CDB)<
PTF (ࣈ61 kcal mol−1,5CDB)<lycopene (ࣈ73 kcal mol−1,11
CDB).[32] This highe flexibili y and wis abili y a e assumed
o ansla e in o be e inse ion o hese ca o enoids be ween
lipid molecules composing mixed micelles. Howe e , we canno
conclude whe he he high bioaccessibili y o PT and PTF is due
o hei cis-isome iza ion, o hei high molecula flexibili y, o
bo h. Second, we s udied he up ake o PT and PTF by in es inal
cells. The fi s key obse a ion was ha hei up ake efficiency
was much highe han ha o lycopene. In ac , he up ake
efficiency o PTF was equi alen o ha o lu ein and β-ca o ene.
The second key obse a ion was ha he sa u able up ake o PT
and PTF s ongly sugges ed a p o ein-media ed up ake. Ano he
in e es ing obse a ion was ha PT up ake was highe han ha
o PTF a high die a y concen a ions, i.e. >2µm(Figu eS2,
Suppo ing In o ma ion), while i was lowe a low die a y
concen a ions (Table 2). This effec o he colo less ca o enoid
concen a ion on hei ela i e cellula up ake efficiency was
unexpec ed bu i was in ag eemen wi h a p e ious s udy.[43] In
his clinical s udy, he bioa ailabili y o PTF was highe han ha
o PT in he g oup o subjec s who inges ed he lowes concen a-
ions o colo less ca o enoids (ࣈ0.9 mg o PT and PTF pe day o
12 weeks), while i was he opposi e in he g oup who inges ed
he highes concen a ions (4.6 mg o PT and 3.2 mg o PTF
pe day o 12 weeks). We hypo hesize ha his concen a ion
effec can be due o diffe ences be ween PT and PTF ega ding
hei ela i e affini y o memb ane anspo e (s). Indeed, he
highe appa en Qmax o PT,ascompa ed o ha o PTF,couldbe
explained by he hypo hesis ha PTF possesses a highe affini y
o he main anspo e o hese colo less ca o enoids han PT.
This las hypo hesis is suppo ed by i s lowe appa en Kand
by he ac ha PTF significan ly inhibi ed PT up ake while
he opposi e was no obse ed. The pe cen ages o heo e ical
bioa ailabili y o PT and PTF a 0.5 µm, i.e., a a low die a y
concen a ion, we e 18.3 and 26.1%, espec i ely, which was in
ag eemen wi h he esul s ob ained in he p e iously men ioned
s udy.[43]
A e ob aining esul s ha sugges ed he colo less ca o enoid
up ake is p o ein media ed, we e alua ed whe he p o eins ha
ha e been shown o pa icipa e in he up ake o commonly con-
sumed ca o enoids, i.e., SR-BI, CD36, and NPC1L1,[27] a e also
in ol ed in PT and PTF up ake. O e all, ou esul s sugges ha
SR-BI is in ol ed in he up ake o PT and PTF while CD36 and
NPC1L1 a e no . The in ol emen o SR-BI is in ag eemen wi h
he esul s ob ained o o he ca o enes, i.e., lycopene and β-
ca o ene.[24,25,44] The lack o in ol emen o CD36 sugges s ha
his p o ein is mo e specifically associa ed wi h he up ake o
p o i amin A ca o enoids.[24] Ano he in e es ing finding was
ha abou 14% o PT and PTF aken up by he cells was appa -
en ly effluxed back o hei apical side. This is consis en wi h p e-
ious da a sugges ing ha o he a -soluble mic onu ien s, such
as ocophe ol, cholecalci e ol, o phylloquinone,[33,45,46] a e pa -
ially effluxed by Caco-2. A e ha ing ob ained key in o ma ion
on he mechanisms implica ed in abso p ion o hese ca o enoids
and because hese phy ochemicals migh be used in he u u e as
die a y supplemen s, whe he hey exhibi demons a ed benefi s
o heal h, we assessed whe he hey compe e wi h commonly
consumed ca o enoids o ei he hei micelliza ion o in es inal
cell up ake. Indeed, significan compe i ions a hese key s eps o
ca o enoid abso p ion could lead o a dec ease in abso p ion o
ca o enoids ha possess well-acknowledged heal h effec s, e.g.,
β-ca o ene and lu ein. Conce ning micelliza ion, only one com-
pe i ion was obse ed, i.e., PT significan ly impai ed lycopene
micelliza ion. I seems logical o obse e ha he ca o enoid ha
has he highes abili y o be inco po a ed in mixed micelles sig-
nifican ly impai ed he micella inco po a ion o he one ha has
he lowes abili y o be inco po a ed in micelles. Conce ning cel-
lula up ake, ou esul s sugges ha PT and PTF can pa ially
impai he in es inal up ake o β-ca o ene, and ice e sa. This
is in ag eemen wi h p e ious esul s showing ha commonly
consumed ca o enoids compe e o hei in es inal up ake,[47]
and his is likely explained by he ac ha all hese ca o enoids
sha e a leas one common memb ane anspo e , in ha case
SR-BI.
In summa y, his s udy has p o ided esul s allowing us o
sugges why he bioaccessibili y o PT and PTF is unexpec -
edly high as compa ed o ha o he o he main linea die a y
ca o ene, i.e., lycopene. Indeed, his is likely because hese colo -
less ca o enoids a e p esen mainly as cis-isome s in oods and/o
because o hei high molecula flexibili y. This s udy has also
p o ided us da a sugges ing ha SR-BI, which is in ol ed in up-
ake o commonly consumed ca o enoids, is also in ol ed in cel-
lula up ake o PT and PTF, which in u n explains compe i ions
o cellula up ake. We ha e also ob ained da a sugges ing ha a
ac ion o abso bed PT and PTF is effluxed back o he in es inal
lumen. We acknowledge some limi a ions o his s udy. Fi s , we
compa ed micelliza ion o mainly cis-isome s o PT and PTF wi h
ha o all- ans isome s o commonly consumed ca o enoids.
Thus, we canno conclude ha all- ans PT and PTF a e be e
inco po a ed in micelles han all- ans common ca o enoids. Ne -
e heless, his would ha e a low in e es o nu i ionis s because
hese colo less ca o enoids a e na u ally p esen in oods as cis-
isome s. Ye , his could be o in e es o people who would like o
chemically syn hesize hese compounds. The second main limi-
a ion is ha we did no use an in i o diges ion model o assess
bioaccessibili y. Ne e heless, his model was used in p e ious
s udies, and ou aim was o go u he by ob aining da a on he
in insic solubili y o hese ca o enoids in micelles o unde s and
why hey a e so bioaccessible.
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Suppo ing In o ma ion
Suppo ing In o ma ion is a ailable om he Wiley Online Lib a y o om
he au ho .
Acknowledgemen s
P.M.B. and C.D. a e join fi s au ho s. P.B. designed he esea ch p ojec
wi h P.M.B., C.D., and A.M.M.; P.B., C.D., and E.R. designed he p o o-
col; P.M.B. and V.M. conduc ed he micelliza ion s udies; P.M.B., M.M.,
V.M., and M.N. conduc ed he cell s udies; P.M.B. and C.H. measu ed
ca o enoid concen a ions by HPLC; PMB analyzed he esul s wi h C.D.
and E.R.; P.M.B. and C.D. pe o med s a is ical analyses; P.B., P.M.B.,
and C.D. w o e he pape wi h consul a ion om E.R.; P.B. had p i-
ma y esponsibili y o he final con en o he manusc ip . All au-
ho s ha e ead and app o ed he final manusc ip . The au ho s would
like o hank Vincen Migno , Cha lo e Halimi, and Ma ion Nowicki
(C2VN, Ma seille) o aluable echnical assis ance. P.M.B. ecei ed und-
ing o ca y ou a Sho -Te m Scien ific Mission a PB’s human mi-
c onu i ion eam in Ma seille om he Eu opean COST Ac ion EU-
ROCAROTEN (CA15136, Eu opean ne wo k o ad ance ca o enoid e-
sea ch and applica ions in ag o- ood and heal h, www.eu oca o en.eu,
h p://www.cos .eu/COST_Ac ions/ca/CA15136).
The Ca no S a Ins i u e p o ided unding o consumables.
A.M.M. and P.M.B. acknowledged unding om he Andalusian Coun-
cil o Economy, Inno a ion, Science and Employmen (p ojec e .
CAROTINCO-P12-AGR-1287).
Conflic o In e es
A.M.M. is a membe o he ad iso y boa d o IBR-Is aeli Bio echnology
Resea ch, L d. (Ya ne, Is ael).
Keywo ds
bioaccessibili y, bioa ailabili y, ca o enoids, lu ein, β-ca o ene
Recei ed: July 16, 2018
Re ised: Augus 29, 2018
Published online: Sep embe 24, 2018
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