The endoplasmic reticulum and casein-containing vesicles contribute to milk fat globule membrane.

Abstract:

:During lactation, mammary epithelial cells secrete huge amounts of milk from their apical side. The current view is that caseins are secreted by exocytosis, whereas milk fat globules are released by budding, enwrapped by the plasma membrane. Owing to the number and large size of milk fat globules, the membrane surface needed for their release might exceed that of the apical plasma membrane. A large-scale proteomics analysis of both cytoplasmic lipid droplets and secreted milk fat globule membranes was used to decipher the cellular origins of the milk fat globule membrane. Surprisingly, differential analysis of protein profiles of these two organelles strongly suggest that, in addition to the plasma membrane, the endoplasmic reticulum and the secretory vesicles contribute to the milk fat globule membrane. Analysis of membrane-associated and raft microdomain proteins reinforces this possibility and also points to a role for lipid rafts in milk product secretion. Our results provide evidence for a significant contribution of the endoplasmic reticulum to the milk fat globule membrane and a role for SNAREs in membrane dynamics during milk secretion. These novel aspects point to a more complex model for milk secretion than currently envisioned.

journal_name

Mol Biol Cell

authors

Honvo-Houéto E,Henry C,Chat S,Layani S,Truchet S

doi

10.1091/mbc.E16-06-0364

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

2946-64

issue

19

eissn

1059-1524

issn

1939-4586

pii

mbc.E16-06-0364

journal_volume

27

pub_type

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