NAD induces astrocyte calcium flux and cell death by ART2 and P2X7 pathway.
Mono-ADP-ribosyltransferase 2 (ART2) is found in mouse T cells and has mediated NAD-induced cell death (NICD) alongside the P2X7 pathway. We determined whether ART2 was expressed in mouse brain astrocytes and the possible function of the NAD-ART2-P2X7 pathway in astrocytes. Our results demonstrate that ART2 existed both in cultured mouse astrocytes and mouse brain slices. Exposure of astrocytes to the ART2 substrate, NAD, induced calcium elevation, which was blocked by ART2 and P2X7 inhibitors. ATP and NAD had an additive effect on calcium elevation. NICD in low-calcium conditions was blocked by ART2 and P2X7 inhibitors. The harmful effect of ATP on astrocytes was inhibited by P2X7 and ART2 inhibitors, meaning that endogenous NAD release may occur. Both NICD function and oxygen-glucose deprivation injury in mouse brain slices were also involved in the ART2-P2X7 pathway. Collectively, to our knowledge, our study provides the first evidence that ART2 exists in mouse brain astrocytes and NAD induces calcium elevation and astrocyte death by an ART2 and P2X7-mediated mechanism. The results suggest a novel approach for manipulating astrocyte death.
Department of Pathology, Zhejiang University School of Medicine, Hangzhou, China.
Jianbiao
J
Wang
Junhua
J
Yang
Puqing
P
Liu
Xiwen
X
Bi
Cui
C
Li
Keqing
K
Zhu
D036002:ADP Ribose Transferases / Q000235:genetics / Q000378:metabolism*; D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D001253:Astrocytes / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D001921:Brain / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D002118:Calcium / Q000378:metabolism*; D020013:Calcium Signaling / Q000187:drug effects*; D016923:Cell Death / Q000187:drug effects; D002478:Cells, Cultured; D005786:Gene Expression Regulation / Q000187:drug effects; D008297:Male; D051379:Mice; D009243:NAD / Q000494:pharmacology*; D058486:Receptors, Purinergic P2X7 / Q000378:metabolism*
D058486:Receptors, Purinergic P2X7; D009243:NAD; D000255:Adenosine Triphosphate; D036002:ADP Ribose Transferases; C449322:Art2a protein, mouse; D002118:Calcium