The mitochondrial Nod-like receptor NLRX1 modifies apoptosis through SARM1.

Abstract:

:NLRX1, the mitochondrial NOD-like receptor (NLR), modulates apoptosis in response to both intrinsic and extrinsic cues. Insights into the mechanism of how NLRX1 influences apoptosis remain to be determined. Here, we demonstrate that NLRX1 associates with SARM1, a protein with a toll/interleukin-1 receptor (TIR)-containing domain also found in adaptor proteins downstream of toll-like receptors, such as MyD88. While a direct role of SARM1 in innate immunity is unclear, the protein plays essential roles in Wallerian degeneration (WD), a type of neuronal catabolism occurring following axonal severing or damage. In non-neuronal cells, we found that endogenous SARM1 was equally distributed in the cytosol and the mitochondrial matrix, where association with NLRX1 occurred. In these cells, the apoptotic role of NLRX1 was fully dependent on SARM1, indicating that SARM1 was downstream of NLRX1 in apoptosis regulation. In primary murine neurons, however, Wallerian degeneration induced by vinblastine or NGF deprivation occurred in SARM1- yet NLRX1-independent manner, suggesting that WD requires the cytosolic pool of SARM1 or that NLRX1 levels in neurons are too low to contribute to WD regulation. Together, these results shed new light into the mechanisms through which NLRX1 controls apoptosis and provides evidence of a new link between NLR and TIR-containing proteins.

journal_name

Mol Cell Biochem

authors

Killackey SA,Rahman MA,Soares F,Zhang AB,Abdel-Nour M,Philpott DJ,Girardin SE

doi

10.1007/s11010-018-3444-3

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

187-196

issue

1-2

eissn

0300-8177

issn

1573-4919

pii

10.1007/s11010-018-3444-3

journal_volume

453

pub_type

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