... and bradykinin synthesis, since HAinhibited their synthesis in a MW-dependent manner [16].Further, HA has been shown to induce analgesia in abradykinin-induced model of joint pain in rats ... the proinflammatorycytokines IL-1 and TNF-α [29–31,36]. NO may be involved in cartilage catabolism by inhibiting the synthesis of colla-gen and PG, enhancing MMP activity, reducing the synthe-sis ... of many MMPs increases in OA by either an increase in theirown synthesis, an increased activation by their proen-zymes, or decreased activity of their inhibitors [29]. Pro-inflammatory cytokines,...