alexa Analysis of inhibitor of apoptosis protein family expression during mammary gland development.
Molecular Biology

Molecular Biology

Journal of Cytology & Histology

Author(s): Owens TW, Foster FM, TanianisHughes J, Cheung JY, Brackenbury L,

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Abstract BACKGROUND: Inhibitors-of-Apoptosis-Proteins (IAPs) are an evolutionarily conserved family of proteins capable of regulating several facets of apoptosis. IAPs are frequently dysregulated in cancer, but their role in the regulation of apoptosis during developmental processes is not fully understood. Here we examined the expression of IAPs during the post-natal development of the mouse mammary gland, which is a tissue that exhibits a profound induction of apoptosis during involution. RESULTS: Six out of eight mammalian IAP family members are expressed in the mammary gland. Notably, quantitative PCR and immunoblotting revealed that XIAP, c-IAP1 and c-IAP2 are down-regulated in pregnancy and lactation, and prior to the onset of involution. In cultured mammary epithelial cells (MECs), XIAP levels decreased in response to inhibition of growth factor signalling. Maintaining XIAP levels in MECs by expressing exogenous XIAP protected them from all apoptotic stimuli tested. CONCLUSIONS: These data suggest that the developmental regulation of IAP expression in vivo contributes to naturally occurring programmes of cell death.
This article was published in BMC Dev Biol and referenced in Journal of Cytology & Histology

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