Id1 delays senescence of primary human melanocytes

The Id family of helix-loop-helix transcription factors is upregulated in a variety of human malignancies and has been implicated in promoting tumorigenesis through effects on cell growth, differentiation, and tumor angiogenesis. While expression of Id proteins has been associated with tumorigenesis, the precise mechanistic relationship between Id expression and carcinogenesis has not been clearly delineated. We have previously shown that Id1 delays cellular senescence in primary mammalian cells through inhibition of the cell cycle regulatory protein and familial melanoma gene, p16/INK4a. We have also demonstrated that Id1 expression is upregulated in early stage primary human melanomas and may be an important marker for early malignancy. In order to further define the role of Id1 in human melanoma development, we have evaluated the function of Id1 in primary human melanocytes. Here we show that constitutive expression of Id1 in primary human melanocytes leads to delayed cellular senescence and decreased expression of the familial melanoma gene, p16/INK4a. Although melanocytes constitutively expressing Id1 are shown to possess extended lifespans, this is not associated with an appreciable change in cell growth or telomere length. We conclude that Id1 delays cellular senescence in primary human melanocytes through inhibition of p16/INK4a expression and suggest that Id1 may contribute to the malignant conversion of primary human melanocytes through extension of cellular lifespan.

Cummings, Staci D.
Ryu, Byungwoo
Samuels, Michael A.
Yu, Xiaobing
Meeker, Alan K.
Healey, Megan A.
Alani, Rhoda M.
Item Type: 
Journal Article
Publication Title: 
Molecular Carcinogenesis
Journal Abbreviation: 
Mol. Carcinog.
Publication Date: 
Publication Year: 
Library Catalog: 
NCBI Published Medical (?)
PMID: 18240291 PMCID: PMC4066980

Turabian/Chicago Citation

Staci D. Cummings, Byungwoo Ryu, Michael A. Samuels, Xiaobing Yu, Alan K. Meeker, Megan A. Healey and Rhoda M. Alani. 2008-09. "Id1 delays senescence of primary human melanocytes." Molecular Carcinogenesis 47: 9: 653-659. 10.1002/mc.20422.

Wikipedia Citation

<ref> {{Cite journal | doi = 10.1002/mc.20422 | issn = 1098-2744 | volume = 47 | pages = 653-659 | last = Cummings | first = Staci D. | coauthors = Ryu, Byungwoo, Samuels, Michael A., Yu, Xiaobing, Meeker, Alan K., Healey, Megan A., Alani, Rhoda M. | title = Id1 delays senescence of primary human melanocytes | journal = Molecular Carcinogenesis | date = 2008-09 | pmid = | pmc = }} </ref>