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- W2029023425 abstract "Epidermal growth factor (EGF) has been suggested to be involved in mammary gland development by mitogenic stimulation of the ductal and alveolar epithelium in virgin mice. The present studies demonstrate that also in late-pregnant mice EGF leads to proliferation of the ductal, ductular, and alveolar epithelium. The mitogenic effect is associated with structural and functional dedifferentiation of alveolar cells as revealed by analysis of morphology, expression of cytosolic and secretory proteins, and fatty acid synthesis. Using a combination of metabolic inhibitors, the dedifferentiating effect of EGF could be blocked while the mitogenic action was not influenced. This finding demonstrates that the signal transduction pathway leading to dedifferentiation and mitosis can be separated, and that the dedifferentiating effect of EGF is independent of its mitogenic properties, but is probably mediated by activation of the arachidonic acid-dependent pathways (cyclo- and lipoxygenase pathways). Release of arachidonic acid from the endogenous phospholipid pool was found to be an early response of the explants to EGF. Accordingly, arachidonic acid itself proved to be capable of inducing epithelial dedifferentiation but failed to stimulate proliferation. TGF alpha showed qualitatively similar effects as EGF but was generally a stronger agonist. It is suggested that EGF and TGF alpha also play a role in mammary gland physiology during pregnancy by final developing and maintenance of the lobulo-alveolar structure in the mammary gland and prevention of premature onset of lactation, and that this is mediated through the PLA2-arachidonic acid signalling cascade." @default.
- W2029023425 created "2016-06-24" @default.
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- W2029023425 date "1995-03-01" @default.
- W2029023425 modified "2023-09-24" @default.
- W2029023425 title "EGF and TGFα modulate structural and functional differentiation of the mammary gland from pregnant mice in vitro: Possible role of the arachidonic acid pathway" @default.
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- W2029023425 doi "https://doi.org/10.1002/jcb.240570315" @default.
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