作者
Hugo Moreiras, Liliana Bento‐Lopes, Matilde V Neto, Cristina Escrevente, Luís C Cabaço, Michael J Hall, José S Ramalho, Miguel C Seabra, Duarte C Barral
发表日期
2022/6
期刊
Traffic
卷号
23
期号
6
页码范围
331-345
出版商
John Wiley & Sons A/S
简介
In the skin epidermis, melanin is produced and stored within melanosomes in melanocytes, and then transferred to keratinocytes. Different models have been proposed to explain the melanin transfer mechanism, which differ essentially in how melanin is transferred—either in a membrane‐bound melanosome or as a melanosome core, that is, melanocore. Here, we investigated the endocytic route followed by melanocores and melanosomes during internalization by keratinocytes, by comparing the uptake of melanocores isolated from the supernatant of melanocyte cultures, with melanosomes isolated from melanocytes. We show that inhibition of actin dynamics impairs the uptake of both melanocores and melanosomes. Moreover, depletion of critical proteins involved in actin‐dependent uptake mechanisms, namely Rac1, CtBP1/BARS, Cdc42 or RhoA, together with inhibition of Rac1‐dependent signaling …
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