Role of green tea polyphenols in the inhibition of collagenolytic activity by collagenase.
Inhibitory effect of green tea polyphenols viz., catechin and epigallocatechin gallate (EGCG) on the action of collagenase against collagen has been probed in this study. Catechin and EGCG treated collagen exhibited 56 and 95% resistance, respectively, against collagenolytic hydrolysis by collagenase. Whereas direct interaction of catechin and EGCG with collagenase exhibited 70 and 88% inhibition, respectively, to collagenolytic activity of collagenase against collagen and the inhibition was found to be concentration dependent. The kinetics of inhibition of collagenase by catechin and EGCG has been deduced from the extent of hydrolysis of (2-furanacryloyl-L-leucyl-glycyl-L-prolyl-L-alanine), FALGPA. Both catechin and EGCG exhibited competitive mode of inhibition against collagenase. The change in the secondary structure of collagenase on treatment with catechin and EGCG has been monitored using circular dichroism spectropolarimeter. CD spectral studies showed significant changes in the secondary structure of collagenase on treatment with higher concentration of catechin and EGCG. Higher inhibition of EGCG compared to catechin has been attributed to the ability of EGCG to exhibit better hydrogen bonding and hydrophobic interaction with collagenase.
Madhan
B
B
Central Leather Research Institute, Adyar, Chennai 600020, India.
Krishnamoorthy
G
G
Rao
J Raghava
JR
Nair
Balachandran Unni
BU
D000818:Animals; D002392:Catechin / Q000031:analogs & derivatives / Q000737:chemistry / Q000494:pharmacology; D002942:Circular Dichroism; D003094:Collagen / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000494:pharmacology*; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology*; D066298:In Vitro Techniques; D007700:Kinetics; D008297:Male; D061965:Matrix Metalloproteinase Inhibitors; D008958:Models, Molecular; D010636:Phenols / Q000737:chemistry / Q000494:pharmacology*; D059808:Polyphenols; D011487:Protein Conformation / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D013662:Tea / Q000737:chemistry*
D004791:Enzyme Inhibitors; D005419:Flavonoids; D061965:Matrix Metalloproteinase Inhibitors; D010636:Phenols; D059808:Polyphenols; D013662:Tea; D002392:Catechin; D003094:Collagen; C045651:epigallocatechin gallate