Bim expression is reduced in human cutaneous melanomas.
Bim is a BH3-only protein belonging to the Bcl-2 family of apoptotic regulators. Upon activation, Bim can antagonize all the prosurvival Bcl-2 proteins, leading to apoptosis. To investigate whether Bim plays a role in melanoma progression, we used tissue microarray and immunohistochemistry to measure Bim expression in 52 cases of dysplastic nevi, 159 cases of primary melanomas and 52 cases of melanoma metastases, and evaluated the prognostic value of Bim expression. Our results showed that Bim expression is reduced as melanoma progresses. Significant differences for Bim staining pattern were observed between dysplastic nevi and metastatic melanomas (P<0.001, chi2 test), and between primary melanomas and metastatic melanomas (P<0.001, chi2 test). Moreover, reduced Bim expression is significantly correlated with poor 5-year survival of melanoma patients but failed to be an independent prognostic factor by Cox regression analysis. Our data suggest that Bim loss may play an important role in melanoma progression.
Dai
Derek L
DL
Department of Dermatology and Skin Science, Jack Bell Research Centre, Vancouver, British Columbia, Canada.
Wang
Yemin
Y
Liu
Min
M
Martinka
Magdalena
M
Li
Gang
G
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017209:Apoptosis / Q000502:physiology; D051017:Apoptosis Regulatory Proteins / Q000235:genetics* / Q000378:metabolism; D000072224:Bcl-2-Like Protein 11; D001706:Biopsy; D018450:Disease Progression; D004416:Dysplastic Nevus Syndrome / Q000235:genetics / Q000473:pathology; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008545:Melanoma / Q000235:genetics* / Q000401:mortality / Q000556:secondary*; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis; D011379:Prognosis; D016016:Proportional Hazards Models; D011518:Proto-Oncogene Proteins / Q000235:genetics* / Q000378:metabolism; D012878:Skin Neoplasms / Q000235:genetics* / Q000401:mortality / Q000473:pathology*
D051017:Apoptosis Regulatory Proteins; C000606775:BCL2L11 protein, human; D000072224:Bcl-2-Like Protein 11; D008565:Membrane Proteins; D011518:Proto-Oncogene Proteins