Nonclassical mechanisms of secretory protein in eukaryotic cells

Yi chuan = Hereditas
Nan-Nan ZhangQing-Wei Li

Abstract

Intercellular communication is fundamental in many biological processes involved in cell growth, differentiation, development, and reproduction of living organisms and secretory proteins are among the most important messengers in this network of information. The vast majority of extracellular proteins are exported from cells by the endoplasmic reticulum/Golgi-dependent secretory pathway. However, increasing evidence shows that there are a group of secretory proteins without signal peptides, defined as nonclassical secretory proteins, which are exported via an ER/Golgi-independent pathway to perform extracellular functions. This pathway has been termed nonclassical or unconventional secretion, which is an essential and beneficial supplement of the ER-Golgi secretion pathway. The nonclassical secretion pathway has close relation with cell multiplication, immune response, tumor formation, infection pathology and so on. Here, the characters, the possible secretory mechanism, and the biological significance of nonclassical secretory proteins were reviewed.

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