Journal
JOURNAL OF DERMATOLOGICAL SCIENCE
Volume 90, Issue 3, Pages 253-262Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.jdermsci.2018.02.008
Keywords
Mitf-M; Melanogenesis; Melanocytes
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Funding
- 863 project [2013AA102506]
- Special Fund for Agro-scientific Research in the Public Interest of China [201303119]
- Aid Program for Innovation Team in Shanxi Agricultural University [CXTD201201]
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Background: Although the impact of the microphthalamia-associated transcription factor (Mitf) signaling pathway on melanocytes progression has been extensively studied, the specific molecular mechanisms behind MITF-M-enhanced melanin production in melanocytes still need to be clarified. Methods: In this study, we analyzed the levels of Mitf-M in skin tissues of different coat mice in order to further reveal the relationship between Mitf-M and skin pigmentation. To address the function of Mitf-M on melanogenesis, we have used an overexpression system and combined morphological and biochemical methods to investigate its localization in different coat color mice and pigmentation-related genes' expression in mouse melanocytes. Results: The qRT-PCR assay and Western blotting analysis revealed that Mitf-M mRNA and protein were synthesized in all tested mice skin samples, with the highest expression level in brown skin, a moderate expression level in grey skin and the lowest expression level in black skin. Simultaneously, immunofluorescence staining revealed that MITF-M was mainly expressed in the hair follicle matrix and inner and outer root sheath in the skin tissues with different coat colors. Furthermore, overexpression of MITF-M led to increased melanin content and variable pigmentation-related gene expression. Conclusion: These results directly demonstrate that MITF-M not only influences melanogenesis, but also determines the progression of melanosomal protein in mouse melanocytes. (C) 2018 Published by Elsevier B.V. on behalf of Japanese Society for Investigative Dermatology.
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