Patent EP-1774958-A1 (EP)
Inventor: BOULLE CHRISTOPHE
IPC: A61K8/49
Filed: 2006-09-18
Abstract: A regime or regimen for promoting, inducing or stimulating the pigmentation of human keratinous substances and/or for preventing or limiting the depigmentation or whitening of keratinous substances, involves administering a phenylfurylmethylthiazolidine-2,4-dione or phenylthienylmethylthiazolidine-2,4-dione derivative (I) or its salt or solvate. A regime or regimen for promoting, inducing or stimulating the pigmentation of human keratinous substances and/or for preventing or limiting the depigmentation or whitening of keratinous substances, involves administering a phenylfurylmethylthiazolidine-2,4-dione or phenylthienylmethylthiazolidine-2,4-dione compound of formula (I) or its salt or solvate. X : O or S; A1(un)saturated 1-20C alkyl (optionally substituted by Z1) or H; A2 - A5(un)saturated 1-20C alkyl, (un)saturated 3 - 7-membered hydrocarbon ring (both optionally substituted by Z1), H or Z1; p : 0 - 5; Z1halo, CF3, OCF3, CN, NO2, OZ2, OCOZ2, OCONZ2Z2a, SZ2, SCOZ2, SCONZ2Z2a, SCSOZ2, SCSNZ2Z2a, NZ2Z2a, NZ2C(=NZ2a)NZ2bZ2c, NZ2SO2Z2a, COZ2, COOZ2, CONZ2Z2a, CSZ2, CSNZ2Z2a, SO3Z, SO2NZ2Z2a, SO2Z2, SiZ2Z2aZ2b or Si(OZ2)(OZ2a)OZ2b, (un)saturated 1-20C alkyl, (un)saturated 4 - 15-membered ring (optionally containing at least one O, N or S atom) (optionally fused to another ring) (optionally substituted by OZ2, CF3, halo or (un)saturated 1-20C alkyl (optionally containing carbonyl or thiocarbonyl)); Z2, Z2a, Z2b and Z2c(un)saturated 1-20C alkyl, (un)saturated 4 - 15-membered ring (optionally containing at least one O, N or S atom) (optionally fused to another ring) (both optionally substituted by Z3), or H; Z3Z4, (un)saturated 1-20C alkyl or (un)saturated 4 - 15-membered ring (optionally containing at least one O, N or S atom) (optionally fused to another ring) (both optionally substituted by Z4); Z4halo, CF3, OCF3, CN, NO2, OZ5, OCOZ5, OCONZ5Z5a, SZ5, SCOZ5, SCONZ5Z5a, SCSOZ5, SCSNZ5Z5a, NZ5Z5a, NZ5COZ5a, NZ5CONZ5aZ5b, NZ5C(=NZ5a)NZ5bZ5c, NZ5SO2Z5a, COZ5, COOZ5, CONZ5Z5a, CSZ5, CSNZ5Z5a, SO3Z, SO2NZ5Z5a, SO2Z5, SiZ5Z5aZ5b or Si(OZ5)(OZ5a)OZ5b; Z5, and Z5a - Z5cH, (un)saturated 1-20C alkyl or (un)saturated 4 - 15-membered ring (optionally containing at least one O, N or S atom) (optionally fused to another ring) (optionally substituted by CF3, halo, or (un)saturated 1-20C alkyl). Provided that when A5 is CH2, then Z2 and Z2a are not H or methyl. An independent claim is also included for a composition containing at least one prostaglandin and (I) or its salt or solvate. [Image] ACTIVITY : None given. MECHANISM OF ACTION : 15-Hydroxyprostaglandin dehydrogenase (15-PGDH) inhibitor; Melanin production stimulator. The efficacy of 4-{5-[(2,4-dioxo-1,3- thiazolidin-5-yl) methyl]-2-furyl}benzoic acid (Ia) was tested for in vitro 15-PGDH inhibitory activity. To a solution of Tris buffer (100 mM, pH 7.4, 0.965 ml) containing dithiothreitol (0.1 mM), beta -NAD (1.5 mM), and prostaglandin E2 (50 mu M), an enzymatic suspension of 15-PGDH enzyme in a medium (concentration 0.3 mg/ml, 0.035 ml) was added at 37[deg]C (corresponding to increase in the optical density at 340 nm). The maximum reaction rate was recorded. The test values (comprising (Ia)) were compared with the control values (without (Ia)). It was observed that (Ia) showed the IC50 of (3 mu M).