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首页> 外文期刊>Pigment cell research >Triazine-based tyrosinase inhibitors identified by chemical genetic screening
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Triazine-based tyrosinase inhibitors identified by chemical genetic screening

机译:化学遗传筛选鉴定基于三嗪的酪氨酸酶抑制剂

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As most of the available depigmenting agents exhibit only modest activity and some exhibit toxicities that lead to adverse side effects after long-term usage, there remains a need for novel depigmenting agents. Chemical genetic screening was performed on cultured melanocytes to identify novel depigmenting compounds. By screening a tagged-triazine library, we identified four compounds, TGH11, TGD10, TGD39 and TGJ29, as potent pigmentation inhibitors with IC50 values in the range of 10 mu M. These newly identified depigmenting compounds were found to function as reversible inhibitors of tyrosinase, the key enzyme involved in melanin synthesis. Tyrosinase was further confirmed as the cellular target of these compounds by affinity chromatography. Kinetic data suggest that all four compounds act as competitive inhibitors of tyrosinase, most likely competing with L-3,4-dihydroxyphenylalanine (L-DOPA) for binding to the DOPA-binding site of the enzyme. No effect on levels of tyrosinase protein, processing or trafficking was observed upon treatment of melanocytes with these compounds. Cytotoxicity was not observed with these compounds at concentrations up to 20 mu M. Our data suggest that TGH11, TGD10, TGD39 and TGJ29 are novel potent tyrosinase inhibitors with potential beneficial effects in the treatment of cutaneous hyperpigmentation.
机译:由于大多数可用的脱色剂仅表现出适度的活性,并且一些显示出长期使用后会导致不良副作用的毒性,因此仍然需要新型的脱色剂。在培养的黑素细胞上进行了化学遗传筛选,以鉴定新的脱色素化合物。通过筛选标记的三嗪文库,我们鉴定了四种化合物TGH11,TGD10,TGD39和TGJ29,它们是有效的色素沉着抑制剂,IC50值在10μM范围内。这些新发现的脱色素化合物被发现可作为酪氨酸酶的可逆抑制剂。 ,涉及黑色素合成的关键酶。通过亲和色谱法进一步证实酪氨酸酶是这些化合物的细胞靶标。动力学数据表明,所有四种化合物均是酪氨酸酶的竞争性抑制剂,最有可能与L-3,4-二羟基苯丙氨酸(L-DOPA)竞争与酶的DOPA结合位点的结合。用这些化合物处理黑素细胞后,未观察到对酪氨酸酶蛋白水平,加工或运输的影响。这些化合物在浓度高达20μM时未观察到细胞毒性。我们的数据表明TGH11,TGD10,TGD39和TGJ29是新型强效酪氨酸酶抑制剂,在治疗皮肤色素沉着方面具有潜在的有益作用。

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