Medicinal Plants in the Management of Rheumatoid Arthritis: Insights from the Oriental Region

DOI: 10.5281/zenodo.17805392 This work is licensed under a Creative Commons Attribution 4.0 International License . This allows re -distribution and re -use of a licensed work on the condition that the author is appropriately credited and the original work is properly cited. Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. https://doi.org/10.5281/zenodo.17805392 CHAPTER 9 Medicinal Plants in the Management of Rheumatoid Arthritis: Insights from the Oriental Region Praveen Deepak Postgraduate Department of Zoology, S. S. College, Jehanabad 804408 Bihar, India Corresponding author Email: [email protected] Received: 20 November 2025; Accepted: 25 November 2025; Available online: 3 December 2025 Abstract: Rheumatoid arthritis (RA) is a chronic autoimmune disorder characterized by persistent joint inflammation, synovial hyperplasia, and progressive cartilage destruction. While conventional therapies, such as corticosteroids, DMARDs, and biologics, have improved disease management, their high cost and adverse effects have driven a resurgence of interest in medicinal plants, particularly from the Oriental region. This chapter explores the phytotherapeutic potential of oriental medicinal flora in mitigating RA pathophysiology through immunomodulatory, antioxidant, and anti -inflammatory pathways. Integrating molecular pharmacology, traditional knowledge systems, and sustainable bioresource management, this chapter underscores the interdisciplinary bridge between ethnomedicine and modern life sciences. Praveen Deepak Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 90 Keywords: Rheumatoid arthritis, Medicinal plants, Oriental region, Immunomodulation, Phytotherapy, Sustainability Introduction Rheumatoid arthritis (RA) is a systemic autoimmune disorder marked by chronic synovial inflammation, progressive joint destruction, and diverse extra -articular complications. Its global burden has more than doubled since 1990, with nearly 18 million individuals affected, contributing substantially to morbidity and healthcare costs.1,2 RA arises from dysregulated immune responses involving pro -inflammatory cytokines, synovial hyperplasia, and subsequent cartilage and bone damage.3 Although disease-modifying antirheumatic drugs and biologics, particularly methotrexate and tumour-necrosis factor inhibitors, have improved clinical outcomes, they remain limited by variable efficacy,4 high cost, adverse effects, and incomplete disease control, leaving significant therapeutic gaps, especially in resource-constrained regions. Growing interest in plant -derived therapeutics reflects the need for safe, accessible, and multi-targeted interventions. Medicinal plants contain diverse bioactive compounds, including polyphenols, flavonoids, terpenoids, and alkaloids, which modulate key inflammatory pathways such as NF -κB and MAPK. Many of these species have long -standing traditional use for arthritis and related inflammatory disorders, demonstrating both cultural relevance and pharmacological promise.5 The Oriental region, encompassing South, East, and Southeast Asia, serves as a biodiversity hotspot and a repository of rich ethnomedical knowledge preserved in systems such as Ayurveda and Traditional Chinese Medicine. 6 This ecological and cultural wealth provides fertile ground for identifying novel anti -arthritic agents, while also underscoring the importance of sustainable harvesting, conservation, and equitable benefit-sharing. Addressing the complexity of RA requires an interdisciplinary framework that integrates ethnobotany, phytochemistry, pharmacology, rheumatology, and sustainability sciences. Such an approach supports evidence -based innovation while aligning with broader goals of ecological stewardship and culturally respectful utilisation of traditional knowledge. Rheumatoid Arthritis: Immunopathogenesis and Molecular Targets Rheumatoid arthritis is a systemic autoimmune disorder driven by complex dysregulation of innate and adaptive immunity, leading to persistent synovial inflammation, cartilage degradation, and bone erosion. Central to its development is the early appearance of autoantibodies such as Rheumatoid Factor and Anti -Citrullinated Protein Antibodies (ACPA), which signal a loss of immune tolerance and form pathogenic immune complexes that activate complement pathways Medicinal Plants in the Management of Rheumatoid Arthritis: Insights … Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 91 and recruit inflammatory cells. 7,8 This response is reinforced by aberrant antigen -presenting cells and autoreactive lymphocytes, promoting the formation of ectopic germinal centres and sustaining chronic synovial inflammation. The disease environment is further shaped by an amplified cytokine network dominated by TNF -α, IL -6, and IL -17, which drive endothelial activation, osteoclastogenesis, and matrix degradation, largely through the JAK –STAT signalling axis. 9,10 Excessive production of reactive oxygen and nitrogen species by synovial macrophages, neutrophils, and fibroblasts induces oxidative damage, chondrocyte apoptosis, and NF -κB activation, perpetuating a cycle of inflammation and tissue injury.11 Macrophage polarization toward the proinflammatory M1 phenotype, alongside hyperactivated fibroblast-like synoviocytes, accelerates joint destruction through sustained cytokine release and degradative enzyme production. Given the multifaceted nature of rheumatoid arthritis pathogenesis, phytochemicals such as flavonoids, terpenoids, polyphenols, and alkaloids offer promising multi -target therapeutic potential. They exert their effects by modulating cytokine signalling, inhibiting NF -κB and JAK –STAT pathways, reducing oxidative stress, and promoting anti -inflammatory M2 macrophage polarization. These properties support the exploration of medicinal plants from the Oriental region as sustainable and effective adjuncts in rheumatoid arthritis management. 12 Oriental Medicinal Systems and Rheumatoid Arthritis The Oriental region hosts long -established medical systems such as Ayurveda, Traditional Chinese Medicine (TCM), Unani, and Siddha, all of which provide plant -based strategies for RA grounded in principles of systemic balance, detoxification, and immune modulation (Figure 1). 13 Contemporary immunology increasingly validates these traditional insights. In Ayurveda, RA corresponds to Amavata, arising from Ama accumulation and Vata imbalance,14 paralleling modern concepts of metabolic dysfunction, cytokine overproduction, and oxidative stress. Rasayana herbs, including Withania somnifera , Tinospora cordifolia , and Zingiber officinale , exhibit anti - inflammatory and immunomodulatory actions through NF -κB, TNF -α, and IL -6 regulation.15,16 TCM interprets RA -like symptoms as ‘Bi syndrome’, resulting from Wind, Cold, and Damp obstruction, and treats them with formulations such as Du Huo Ji Sheng Tang and Gui Zhi Shao Yao Zhi Mu Tang, which modulate cytokine profiles and T -cell responses.17,18 Unani and Siddha traditions attribute RA to humoral or doshic imbalances and employ herbs like Boswellia serrata, Commiphora mukul , and Curcuma longa , known to reduce oxidative stress and inflammatory mediators.19,20 Integrating these frameworks with modern immunology supports sustainable ethnopharmacological discovery and strengthens the scientific basis for plant-derived therapeutics. Praveen Deepak Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 92 Phytotherapeutic Agents from the Oriental Region Medicinal plants from the Oriental region have played a longstanding role in the management of RA, offering anti -inflammatory, immunomodulatory, and antioxidant benefits. These therapeutic properties are well documented across Ayurveda, Traditional Chinese Medicine (TCM), and Southeast Asian ethnomedicine (Table 1). Contemporary studies increasingly validate their ability to modulate cytokines, regulate immune cell function, and reduce oxidative tissue damage. Figure 1. Overview of traditional medical systems of the Oriental region . Ayurveda, Traditional Chinese Medicine (TCM), Unani, and Siddha, highlighting their shared principles of systemic balance, detoxification, and immune modulation in the plant-based management of rheumatoid arthritis. Table 1. Selected Oriental medicinal plants used for rheumatoid arthritis (RA) Scientific name Region (Oriental) Plant part used Current status / remarks Ref. Withania somnifera South Asia (India) Root, whole plant Strong preclinical evidence (CIA models); immunomodulatory and anti-inflammatory (↓ TNF -α, IL - 1β). Candidate for adjunct therapy. 21 Boswellia serrata South Asia (India) Resin (gum) Boswellic acids inhibit 5-LOX; clinical/preclinical studies show reduced pain/stiffness in arthritic conditions. 22 Medicinal Plants in the Management of Rheumatoid Arthritis: Insights … Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 93 Curcuma longa South Asia (India) Rhizome (curcumin) Extensive evidence (mechanistic, animal, clinical): NF -κB inhibition, cytokine modulation, promising adjunct. 23 Tinospora cordifolia South Asia (India) Stem, whole plant Immunomodulatory; reduces oxidative stress and arthritis signs in animal models. 24 Zingiber officinale South / SE Asia Rhizome Gingerols/shogaols inhibit COX/LOX; analgesic/anti - inflammatory actions in preclinical and clinical OA/RA contexts. 25 Tripterygium wilfordii East Asia (China) Root / root extract (triptolide) Potent immunosuppressant; multiple RCTs/meta-analyses show efficacy, but toxicity (hepato/renal) restricts use, derivatives under study. 26 Paeonia lactiflora (TGP) East Asia (China) Root (total glucosides of paeony — TGP) Clinical trials & meta-analyses: TGP has immunomodulatory efficacy as adjuvant therapy; generally good safety in trials. 27 Panax ginseng East Asia (China, Korea) Root Ginsenosides (various) modulate macrophages, Th17/Treg balance; preclinical RA models support benefit, clinical data mixed. 28 Angelica sinensis East Asia (China) Root (polysaccharides, ferulic acid) Polysaccharides/ferulic acid reduce proinflammatory cytokines in arthritis models; commonly included in TCM anti -arthritic formulas. 29 Andrographis paniculata Southeast Asia (Thailand, Indonesia) Whole plant / leaves (andrographolide) Andrographolide inhibits NF -κB and inflammatory cytokines; promising preclinical antiinflammatory/autoimmune data. 30 Curcuma xanthorrhiza(J ava turmeric) Southeast Asia (Indonesia) Rhizome Rich in xanthorrhizol; antioxidant and anti-inflammatory properties suggest potential for chronic inflammatory disease. 31 Praveen Deepak Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 94 Boesenbergia rotunda (finger root) SE Asia (Thailand, Indonesia) Rhizome Panduratin A and chalcones (antiinflammatory, NO inhibition); active in vitro/in vivo antiinflammatory studies. 32 Nigella sativa (black seed) South / West Asia Seeds / oil (thymoquinone) RCTs and meta-analyses indicate adjunctive benefit (↓ oxidative markers, improved cytokine profile) in RA; safe in studied doses. 33 Nyctanthes arbortristis (nightjasmine) South / SE Asia Leaves (extracts) Animal and in -vitro RA models show ↓ paw edema, ↓ proinflammatory cytokines (TNF - α) and ↑ IL -10; active constituents under study. 34 Melicope pteleifolia SE Asia (Malaysia, Vietnam) Leaves Active β-GP compound shows antiarthritic effects in murine CIA models (preclinical evidence). 36 Achyranthes bidentata East & South Asia Root (radix) Traditional use in TCM and Ayurveda for rheumatism; several preclinical anti-inflammatory studies. 37 Plectranthus amboinicus SE Asia / India Leaves Traditional anti-arthritic use; patent literature and preclinical reports indicate anti-inflammatory potential. 38 Kadsura coccinea China (Tujia/ethn ic medicines) Stem / triterpenoids Triterpenes suppress IL-6/TNF in macrophage models; in vitro activity on synoviocytes reported. 39 Artemisia ordosica East Asia (China, Mongolia) Aerial parts In CIA rats, extracts reduced paw swelling and cytokines (TNF -α, IL1β, IL-6); mechanistic links to STAT3 pathway reported. 40 Camellia sinensis (green tea - EGCG) East & South Asia (China, India) Leaves (EGCG) EGCG inhibits synovial fibroblast growth, modulates apoptosis and NF-κB; evidence from in vitro and animal RA studies. 41 Medicinal Plants in the Management of Rheumatoid Arthritis: Insights … Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 95 Astragalus membranaceus East Asia (China) Root (polysaccharides, saponins) Polysaccharides show antiinflammatory/immunomodulatory action (OPG/RANKL/NF -κB pathways) in arthritis models. 42 Glycyrrhiza glabra(licorice ) West / South / East Asia Root (glycyrrhizin, glycyrrhetinic acid) Glycyrrhizin/derivatives modulate immune responses and inflammatory mediators; possible adjunct in RA (toxicity/standardization considerations). 43 Scutellaria baicalensis East Asia (China) Root (baicalin, baicalein) Baicalin/baicalein inhibit FLS proliferation, induce apoptosis, modulate PI3K/Akt/NF -κB — promising preclinical evidence & small clinical signals. 44 Alpinia galanga(greate r galangal) SE Asia (India, Thailand) Rhizome Traditional use for joint pain; recent studies (preclinical/quasiclinical) show analgesic and antiinflammatory effects. 45 Curcuma zedoaria(white turmeric) South / SE / East Asia Rhizome Anti-inflammatory sesquiterpenes and antioxidant activity documented; preclinical RA relevance. 46 South Asia Ayurveda identifies several key botanicals for RA. Withania somnifera (ashwagandha) reduces TNF -α and IL -1β via withanolides, supporting relief from joint inflammation. 47 Boswellia serrata provides boswellic acids that inhibit 5 -lipoxygenase, with clinical evidence of reduced pain and stiffness.48 Curcuma longa suppresses NF-κB and cytokine activation through curcumin, 49 while Tinospora cordifolia enhances phagocytic activity and decreases oxidative stress. 50 Zingiber officinale adds COX and LOX inhibition via gingerols and shogaols. 51 East Asia TCM offers potent immunoregulatory agents. Tripterygium wilfordii exerts strong T -cell and cytokine suppression through triptolide, with clinical benefits despite toxicity concerns. 52 Panax ginseng regulates macrophage activity and oxidative stress via ginsenosides. 53 Angelica sinensis Praveen Deepak Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 96 provides phthalides and ferulic acid with antioxidant and vasomodulatory effects, 54 while Paeonia lactiflora modulates T-cell differentiation through paeoniflorin. 27 Southeast Asia Regional ethnomedicine contributes Andrographis paniculata, which inhibits NF -κB and pro - inflammatory cytokines. 55 Curcuma xanthorrhiza supplies xanthorrhizol with broad anti - inflammatory activity,56 and Boesenbergia rotunda offers panduratin A, an inhibitor of nitric oxide synthase and related mediators. 57 Collectively, these botanicals reflect significant, multi -target potential for sustainable complementary RA therapeutics (Figure 2). Figure 2. Oriental Medicinal Plants in RA Therapy . SWOT analysis of phytochemical -based interventions for rheumatoid arthritis, highlighting strengths (anti-inflammatory effects), weaknesses (safety issues), opportunities (enhanced bioavailability), and threats (regulatory hurdles) within therapeutic development. Mechanistic Insights and Molecular Docking Evidence Understanding the mechanistic basis of Oriental medicinal plants in RA is essential for translating traditional knowledge into evidence -based therapeutics. Advances in molecular biology, computational chemistry, and systems analytics show that key RA -related pathways, including JAK/STAT, NF -κB, and MAPK, are major phytochemical targets, with in silico tools like docking and molecular dynamics offering strong mechanistic support (Figure 3). Curcumin from Curcuma longa and andrographolide from Andrographis paniculata inhibit NF -κB activation and downregulate TNF-α and IL-6.55,58 Withanolides from Withania somnifera and boswellic acids from Boswellia serrata suppress MAPK signalling by reducing ERK, JNK, and p38 phosphorylation. 59,60 Triptolide from Tripterygium wilfordii inhibits STAT3 activation, limiting Th17 differentiation, while paeoniflorin and ginsenosides modulate cytokine -driven STAT responses. 27,36,61 Computational studies demonstrate high binding affinity of curcumin, boswellic acids, paeoniflorin, and xanthorrhizol to JAKs, COX -2, TNF -α, and IL-1β,62 with curcumin forming stable interactions in the JAK2 ATP -binding pocket63 and andrographolide favourably docking with NF - Medicinal Plants in the Management of Rheumatoid Arthritis: Insights … Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) ISBN: 978-93-95369-86-2 (paperback) 978-93-95369-58-9 (electronic) | © 2025 Advent Publishing. 97 κB p65. 64 MD simulations confirm the stability of boswellic acid –COX -2 and triptolide –STAT3 complexes.65 Synergistic combinations, such as Curcuma longa with Zingiber officinale or Paeonia lactiflora with Angelica sinensis , enhance bioavailability and broaden target profiles, 66 while metabolomics, proteomics, and network pharmacology continue to elucidate these multitarget interactions, guiding sustainable development of anti-arthritic therapeutics. 67 Figure 3. Computational and omics -based strategies in natural product research for rheumatoid arthritis. The diagram summarizes key integrative approaches, including emerging omics technologies (metabolomics, proteomics, and network pharmacology), in silico docking of bioactive compounds (e.g., curcumin, boswellic acids), molecular dynamics simulations of target–ligand interactions (e.g., COX -2 and STAT3 complexes), and synergistic herb–herb interactions (such as Curcuma longa with Zingiber officinale, and Paeonia lactiflora with Angelica sinensis). Together, these strategies enhance the understanding of phytochemical mechanisms and therapeutic potential in rheumatoid arthritis. Preclinical and Clinical Evidence The therapeutic potential of Oriental medicinal plants in RA is supported by growing preclinical and clinical evidence, although challenges in standardization, dosing, and safety remain. In vitro studies using LPS -stimulated macrophages and fibroblast-like synoviocytes have clarified key antiinflammatory mechanisms. Curcumin from Curcuma longa and andrographolide from Andrographis paniculata inhibit NF -κB and MAPK signalling, reducing TNF -α, IL -6, and nitric oxide.55,58 Triptolide from Tripterygium wilfordii suppresses fibroblast-like synoviocyte proliferation via STAT3 and NF -κB, while boswellic acids from Boswellia serrata lower matrix metalloproteinases, protecting cartilage. 59,68 Animal models, including collagen -induced and adjuvant-induced arthritis, further demonstrate systemic and joint -specific benefits; curcumin reduces swelling and cytokine expression, 44 withanolides from Withania somnifera decrease oxidative stress and improve histopathology, 69 and extracts of Paeonia lactiflora and Angelica sinensis alleviate inflammation.27,70 Clinical trials show efficacy of Boswellia, Tripterygium, and Praveen Deepak Interdisciplinary Research in Life Sciences: A Path Towards Sustainability (Vol. 3) - Jayvardhan V. Balkhande & Jalander Vaghmare (Eds.) 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