Intra-Articular Injections of Polyphenols Protect Articular Cartilage from Inflammation-Induced Degradation: Suggesting a Potential Role in Cartilage Therapeutics

Arthritic diseases, such as osteoarthritis and rheumatoid arthritis, inflict an enormous health care burden on society. Osteoarthritis, a degenerative joint disease with high prevalence among older people, and rheumatoid arthritis, an autoimmune inflammatory disease, both lead to irreversible struct...

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Veröffentlicht in:PloS one 2015-06, Vol.10 (6), p.e0127165-e0127165
Hauptverfasser: Natarajan, Venkatachalam, Madhan, Balaraman, Tiku, Moti L
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Madhan, Balaraman
Tiku, Moti L
description Arthritic diseases, such as osteoarthritis and rheumatoid arthritis, inflict an enormous health care burden on society. Osteoarthritis, a degenerative joint disease with high prevalence among older people, and rheumatoid arthritis, an autoimmune inflammatory disease, both lead to irreversible structural and functional damage to articular cartilage. The aim of this study was to investigate the effect of polyphenols such as catechin, quercetin, epigallocatechin gallate, and tannic acid, on crosslinking type II collagen and the roles of these agents in managing in vivo articular cartilage degradation. The thermal, enzymatic, and physical stability of bovine articular cartilage explants following polyphenolic treatment were assessed for efficiency. Epigallocatechin gallate and tannic acid-treated explants showed >12 °C increase over native cartilage in thermal stability, thereby confirming cartilage crosslinking. Polyphenol-treated cartilage also showed a significant reduction in the percentage of collagen degradation and the release of glycosaminoglycans against collagenase digestion, indicating the increase physical integrity and resistance of polyphenol crosslinked cartilage to enzymatic digestion. To examine the in vivo cartilage protective effects, polyphenols were injected intra-articularly before (prophylactic) and after (therapeutic) the induction of collagen-induced arthritis in rats. The hind paw volume and histomorphological scoring was done for cartilage damage. The intra-articular injection of epigallocatechin gallate and tannic acid did not significantly influence the time of onset or the intensity of joint inflammation. However, histomorphological scoring of the articular cartilage showed a significant reduction in cartilage degradation in prophylactic- and therapeutic-groups, indicating that intra-articular injections of polyphenols bind to articular cartilage and making it resistant to degradation despite ongoing inflammation. These studies establish the value of intra-articular injections of polyphenol in stabilization of cartilage collagen against degradation and indicate the unique beneficial role of injectable polyphenols in protecting the cartilage in arthritic conditions.
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Osteoarthritis, a degenerative joint disease with high prevalence among older people, and rheumatoid arthritis, an autoimmune inflammatory disease, both lead to irreversible structural and functional damage to articular cartilage. The aim of this study was to investigate the effect of polyphenols such as catechin, quercetin, epigallocatechin gallate, and tannic acid, on crosslinking type II collagen and the roles of these agents in managing in vivo articular cartilage degradation. The thermal, enzymatic, and physical stability of bovine articular cartilage explants following polyphenolic treatment were assessed for efficiency. Epigallocatechin gallate and tannic acid-treated explants showed &gt;12 °C increase over native cartilage in thermal stability, thereby confirming cartilage crosslinking. Polyphenol-treated cartilage also showed a significant reduction in the percentage of collagen degradation and the release of glycosaminoglycans against collagenase digestion, indicating the increase physical integrity and resistance of polyphenol crosslinked cartilage to enzymatic digestion. To examine the in vivo cartilage protective effects, polyphenols were injected intra-articularly before (prophylactic) and after (therapeutic) the induction of collagen-induced arthritis in rats. The hind paw volume and histomorphological scoring was done for cartilage damage. The intra-articular injection of epigallocatechin gallate and tannic acid did not significantly influence the time of onset or the intensity of joint inflammation. However, histomorphological scoring of the articular cartilage showed a significant reduction in cartilage degradation in prophylactic- and therapeutic-groups, indicating that intra-articular injections of polyphenols bind to articular cartilage and making it resistant to degradation despite ongoing inflammation. These studies establish the value of intra-articular injections of polyphenol in stabilization of cartilage collagen against degradation and indicate the unique beneficial role of injectable polyphenols in protecting the cartilage in arthritic conditions.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>26046639</pmid><doi>10.1371/journal.pone.0127165</doi><oa>free_for_read</oa></addata></record>
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subjects Acids
Animals
Arthritis
Arthritis, Experimental - drug therapy
Arthritis, Experimental - etiology
Arthritis, Experimental - pathology
Biocompatibility
Biomedical materials
Breakdowns
Cartilage
Cartilage (articular)
Cartilage diseases
Cartilage, Articular - drug effects
Cartilage, Articular - metabolism
Cartilage, Articular - pathology
Catechin
Cattle
Chondroitin sulfate
Collagen
Collagen (type II)
Collagen - analysis
Collagen Type II - toxicity
Collagenase
Collagenases - metabolism
Collagens
Compressive Strength
Crosslinking
Degradation
Diabetes
Digestion
Enzymes
Epigallocatechin gallate
Explants
Female
Glycosaminoglycans
Glycosaminoglycans - analysis
Health care
Industrial research
Inflammation
Injections, Intra-Articular
Laboratory animals
Mucopolysaccharides
Older people
Osteoarthritis
Polymer crosslinking
Polyphenols
Polyphenols - therapeutic use
Protective Agents - pharmacology
Protective Agents - therapeutic use
Quercetin
Rats
Rats, Wistar
Reduction
Rheumatoid arthritis
Rheumatoid factor
Scoring
Stability analysis
Structural damage
Structure-function relationships
Tannic acid
Thermal stability
title Intra-Articular Injections of Polyphenols Protect Articular Cartilage from Inflammation-Induced Degradation: Suggesting a Potential Role in Cartilage Therapeutics
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