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Apoptosis and mammary gland involution: reviewing the process

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Abstract

Apoptosis is a process of programmed cell death. Mammary gland involution is a tissue remodelling process. Mammary epithelial cell apoptosis is an integral component of tissue remodelling but it is only one element. Equally important are the factors which degrade basement membrane and extracellular matrix. Both operations are required for completion of mammary gland involution. The primary apoptotic process occurs first and is temporally distinct from the second stage of involution typified by lobular-alveolar collapse. Local factors related to milk accumulation trigger the first stage, but loss of systemic hormonal stimulation governs the second stage. Changes in the expression patterns of cell cycle control genes and bcl-2 family member genes are found in the first stage. Proteinase gene activation dominates the second stage. These findings support a two stage model of mammary gland involution. Both mammary epithelial cell apoptosis and mammary gland remodelling advance through a process which includes both loss of survival factors and gain of death factors. This review focuses on signalling pathways and genetic controls which are activated and repressed during mammary gland involution.

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Authors and Affiliations

  1. Division of Infectious Diseases, Department of Medicine, University of Maryland School of Medicine, the Baltimore Veterans Affairs Medical Center and the Institute of Human Virology, Baltimore, USA

    P. A. Furth, U. Bar-Peled & M. Li

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  1. P. A. Furth
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  2. U. Bar-Peled
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  3. M. Li
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Furth, P.A., Bar-Peled, U. & Li, M. Apoptosis and mammary gland involution: reviewing the process. Apoptosis 2, 19–24 (1997). https://doi.org/10.1023/A:1026454207398

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  • DOI: https://doi.org/10.1023/A:1026454207398

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