Alginic acid isolated from Sargassum wightii exhibits anti-inflammatory potential on type II collagen induced arthritis in experimental animals.
The present study evaluated the anti-inflammatory potential of alginic acid isolated from the brown algae Sargassum wightii in type II collagen induced arthritic rats, a well established arthritic model that resembles more closely to human rheumatoid arthritis in its clinical, pathological, immunological and histological aspects. Type II collagen induced arthritic rats showed increased activities of inflammatory marker enzymes like cycloxygenase-2 (COX-2), lipoxygenase (5-LOX), xanthine oxidase (XO) and myeloperoxidase (MPO) along with increased concentration of rheumatoid factor (RF), ceruloplasmin and C-reactive protein (CRP). Treatment with alginic acid significantly reduced the activities of COX-2 and 5-LOX along with reduction in MPO, XO, RF and CRP. Alginic acid treatment reverted to the altered levels of hematological parameters like RBC count, WBC count and ESR in arthritic rats. Concentrations of proinflammatory cytokines like IL-1 β, TNF α and IL-6 were significantly higher in arthritic rats which were reduced on treatment with alginic acid. Increased activities of lysosomal enzymes that manifest the systemic damage during arthritis were significantly reduced by the treatment with alginic acid which indicates the reduction in the rupture and degradation of connective tissue. Histopathology of knee joint tissues showed that extensive bone degradation and synovial hyperplasia along with infiltrating cells and treatment with alginic acid reversed the histopathological changes which indicate the protective potential of alginic acid in rheumatoid arthritis.
Department of Biochemistry, University of Kerala, Kariavattom Campus, Trivandrum, Kerala 695881, India.
C H
CH
Sarithakumari
Department of Biochemistry, University of Kerala, Kariavattom Campus, Trivandrum, Kerala 695881, India. Electronic address: gmkbio@gmail.com.
G Muraleedhara
GM
Kurup
D000464:Alginates / Q000302:isolation & purification / Q000494:pharmacology / Q000627:therapeutic use*; D000818:Animals; D000893:Anti-Inflammatory Agents / Q000302:isolation & purification / Q000494:pharmacology / Q000627:therapeutic use*; D001169:Arthritis, Experimental / Q000139:chemically induced / Q000188:drug therapy* / Q000276:immunology / Q000473:pathology; D024043:Collagen Type II; D051546:Cyclooxygenase 2 / Q000276:immunology; D016207:Cytokines / Q000097:blood / Q000276:immunology; D020723:Glucuronic Acid / Q000302:isolation & purification / Q000494:pharmacology / Q000627:therapeutic use; D006603:Hexuronic Acids / Q000302:isolation & purification / Q000494:pharmacology / Q000627:therapeutic use; D007719:Knee Joint / Q000473:pathology; D008084:Lipoxygenase / Q000276:immunology; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D044647:Sargassum / Q000737:chemistry; D014969:Xanthine Oxidase / Q000276:immunology
D000464:Alginates; D000893:Anti-Inflammatory Agents; D024043:Collagen Type II; D016207:Cytokines; D006603:Hexuronic Acids; D020723:Glucuronic Acid; D008084:Lipoxygenase; D051546:Cyclooxygenase 2; C489691:Ptgs2 protein, rat; D014969:Xanthine Oxidase
Arthritis; C-reactive protein lipoxygenase; Cathepsin; Myeloperoxidase; Sargassum wightii