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Pharmacological profile of FK881(ASP6537), a novel potent and selective cyclooxygenase-1 inhibitor.

Abstract：

:Nonsteroidal anti-inflammatory drugs (NSAIDs) are now understood to fall into one of two agent classes in clinical use. Traditional NSAIDs inhibit both cyclooxygenases-1 and 2 (COX-1, 2), which act as key enzymes catalyzing the same reaction in the production of prostaglandins (PGs), while the second class of NSAIDs selectively inhibit COX-2. Inhibition of the inducible COX-2 isoform is believed to be responsible for the therapeutic effects of NSAIDs, such as anti-inflammatory, analgesic, and antipyretic effects, while COX-1 inhibition results in side-effects on the gastrointestinal (GI) system. In the present study, however, we changed this notion that inhibiting only COX-1 causes adverse effects. We discovered FK881, a specific COX-1 inhibitor which exhibits a 650-fold ratio for human whole blood COX-1/COX-2 and rats in vivo. In rats, FK881 dose dependently inhibited carrageenan-induced paw edema (ED30: 22 mg/kg; diclofenac ED30: 3.6 mg/kg, rofecoxib ED30: 26 mg/kg) and paw swelling associated with adjuvant arthritis (ED50: 17 mg/kg; diclofenac ED50: 1.4 mg/kg, rofecoxib ED50: 1.8 mg/kg). Further, FK881 dose dependently inhibited acetic acid-induced writhing in mice (ED50: 19 mg/kg; diclofenac ED50: 14 mg/kg, rofecoxib ED50: >100mg/kg) and adjuvant arthritis hyperalgesia in rats (ED50: 1.8 mg/kg; diclofenac ED50: 1.0mg/kg, rofecoxib ED50: 0.8mg/kg). However, unlike traditional NSAIDs, GI tolerability was improved, although the antipyretic effect of FK881 was weak (NOEL: >320 mg/kg; diclofenac NOEL: <1mg/kg, rofecoxib NOEL: 100 mg/kg). These results suggest that FK881 may be useful in treating symptoms of rheumatoid arthritis and osteoarthritis.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Imanishi J,Morita Y,Yoshimi E,Kuroda K,Masunaga T,Yamagami K,Kuno M,Hamachi E,Aoki S,Takahashi F,Nakamura K,Miyata S,Ohkubo Y,Mutoh S

doi

10.1016/j.bcp.2011.06.035

subject

Has Abstract

pub_date

2011-10-01 00:00:00

pages

746-54

issue

7

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(11)00419-9

journal_volume

82

pub_type

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