Inducing mitophagy in diabetic platelets protects against severe oxidative stress.

Abstract:

:Diabetes mellitus (DM) is a growing international concern. Considerable mortality and morbidity associated with diabetes mellitus arise predominantly from thrombotic cardiovascular events. Oxidative stress-mediated mitochondrial damage contributes significantly to enhanced thrombosis in DM A basal autophagy process has recently been described as playing an important role in normal platelet activation. We now report a substantial mitophagy induction (above basal autophagy levels) in diabetic platelets, suggesting alternative roles for autophagy in platelet pathology. Using a combination of molecular, biochemical, and imaging studies on human DM platelets, we report that platelet mitophagy induction serves as a platelet protective mechanism that responds to oxidative stress through JNK activation. By removing damaged mitochondria (mitophagy), phosphorylated p53 is reduced, preventing progression to apoptosis, and preserving platelet function. The absence of mitophagy in DM platelets results in failure to protect against oxidative stress, leading to increased thrombosis. Surprisingly, this removal of damaged mitochondria does not require contributions from transcription, as platelets lack a nucleus. The considerable energy and resources expended in "prepackaging" the complex mitophagy machinery in a short-lived normal platelet support a critical role, in anticipation of exposure to oxidative stress.

journal_name

EMBO Mol Med

journal_title

EMBO molecular medicine

authors

Lee SH,Du J,Stitham J,Atteya G,Lee S,Xiang Y,Wang D,Jin Y,Leslie KL,Spollett G,Srivastava A,Mannam P,Ostriker A,Martin KA,Tang WH,Hwa J

doi

10.15252/emmm.201506046

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

779-95

issue

7

eissn

1757-4676

issn

1757-4684

pii

emmm.201506046

journal_volume

8

pub_type

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