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Identification of autophagy-dependent secretion machinery

Date:
January 10, 2017
Source:
Osaka University
Summary:
A group of researchers identified a molecular machinery by which autophagy mediates secretion. These results underscore an important role of autophagy other than degradation, and will bring us to future translational research of medicine.
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A group of researchers identified a molecular machinery by which autophagy mediates secretion. These results underscore an important role of autophagy other than degradation, and will bring us to future translational research of medicine.

Autophagy has long been considered as a physiological process solely for degradation, but its secretory role has recently emerged. A group of researchers, including Tomonori Kimura, a researcher at the Department of Nephrology, Osaka University (the research was conducted at the University of New Mexico, USA), identified the molecular machinery by which autophagy mediates secretion of the inflammatory cytokine, interleukin-1 beta, in corporation with SNARE proteins.

In addition to interleukin-1 beta, leaderless proteins such as ferritin, whose secretory system has not been identified, are also found to be secreted based on the same autophagy machinery. Therefore, the newly-identified autophagy-dependent secretory system facilitates the secretion of leaderless proteins, and plays fundamental roles in this secretion.

"Autophagy is related with a diverse spectrum of diseases and has long been anticipated as a therapeutic option from the point of view of degradation. Our findings will open another dimension for therapeutic approaches through the secretory role of autophagy," says Tomonori Kimura.

※1 Autophagy

Autophagy is a self-degradative process for cellular homeostasis. Autophagosome sequesters the degradative targets, whose process is followed by fusion with lysosomes for degradation of its contents. Recently, autophagy is also reported to play a role in secretion.

※2 Inflammatory cytokine

A subset of cytokines (proteins secreted from cells to mediate information to other cells) which promotes inflammation. Interleukin-1 beta is a major inflammatory cytokine which is activated and released upon infection.

※3 SNARE proteins

SNARE proteins mediates vesicular fusion, such as fusion between cellular plasma membrane and cytoplasmic vesicles. This fusion is mediated by a set of SNARE proteins, generally consisting of Qa-, Qb-, Qc-, and R-SNARE proteins.

※4 Leaderless protein

Signal peptides are short peptides in proteins through which proteins are bound for specific cellular distribution or secretion. A number of proteins do not have signal peptides (called leaderless proteins), and their secretory pathway have not been elucidated thus far.


Story Source:

Materials provided by Osaka University. Note: Content may be edited for style and length.


Journal Reference:

  1. Tomonori Kimura, Jingyue Jia, Suresh Kumar, Seong Won Choi, Yuexi Gu, Michal Mudd, Nicolas Dupont, Shanya Jiang, Ryan Peters, Farzin Farzam, Ashish Jain, Keith A Lidke, Christopher M Adams, Terje Johansen, Vojo Deretic. Dedicated SNAREs and specialized TRIM cargo receptors mediate secretory autophagy. The EMBO Journal, 2017; 36 (1): 42 DOI: 10.15252/embj.201695081

Cite This Page:

Osaka University. "Identification of autophagy-dependent secretion machinery." ScienceDaily. ScienceDaily, 10 January 2017. <www.sciencedaily.com/releases/2017/01/170110092102.htm>.
Osaka University. (2017, January 10). Identification of autophagy-dependent secretion machinery. ScienceDaily. Retrieved May 27, 2017 from www.sciencedaily.com/releases/2017/01/170110092102.htm
Osaka University. "Identification of autophagy-dependent secretion machinery." ScienceDaily. www.sciencedaily.com/releases/2017/01/170110092102.htm (accessed May 27, 2017).

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