Mitochondrial ALDH2 improves ß-cell survival and function against doxorubicin-induced apoptosis by targeting CK2 signaling.

Autor: Karunakaran U; Institute of Medical Science, Yeungnam University College of Medicine, Daegu, Republic of Korea., Ha EY; Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Republic of Korea.; Department of Internal Medicine, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Republic of Korea., Elumalai S; Institute of Medical Science, Yeungnam University College of Medicine, Daegu, Republic of Korea., Won KC; Institute of Medical Science, Yeungnam University College of Medicine, Daegu, Republic of Korea.; Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Republic of Korea., Moon JS; Institute of Medical Science, Yeungnam University College of Medicine, Daegu, Republic of Korea.; Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Republic of Korea.
Jazyk: angličtina
Zdroj: Journal of diabetes investigation [J Diabetes Investig] 2024 Jun; Vol. 15 (6), pp. 684-692. Date of Electronic Publication: 2024 May 07.
DOI: 10.1111/jdi.14230
Abstrakt: Aims: The aim of this study was to better understand how the chemotherapy drug doxorubicin contributes to the development of β-cell dysfunction and to explore its relationship with mitochondrial aldehyde dehydrogenase-2 (ALDH2).
Materials and Methods: In order to investigate this hypothesis, doxorubicin was administered to INS-1 cells, a rat insulinoma cell line, either with or without several target protein activators and inhibitors. ALDH2 activity was detected with a commercial kit and protein levels were determined with western blot. Mitochondrial ROS, membrane potential, and lipid ROS were determined by commercial fluorescent probes. The cell viability was measured by CCK-assay.
Results: Exposure of INS-1 cells to doxorubicin decreased active insulin signaling resulting in elevated ALDH2 degradation, compared with control cells by the induction of acid sphingomyelinase mediated ceramide induction. Further, ceramide induction potentiated doxorubicin induced mitochondrial dysfunction. Treatment with the ALDH2 agonist, ALDA1, blocked doxorubicin-induced acid sphingomyelinase activation which significantly blocked ceramide induction and mitochondrial dysfunction mediated cell death. Treatment with the ALDH2 agonist, ALDA1, stimulated casein kinase-2 (CK2) mediated insulin signaling activation. CK2 silencing neutralized the function of ALDH2 in the doxorubicin treated INS-1 cells.
Conclusions: Mitochondrial ALDH2 activation could inhibit the progression of doxorubicin induced pancreatic β-cell dysfunction by inhibiting the acid sphingomyelinase induction of ceramide, by regulating the activation of CK2 signaling. Our research lays the foundation of ALDH2 activation as a therapeutic target for the precise treatment of chemotherapy drug induced β-cell dysfunction.
(© 2024 The Authors. Journal of Diabetes Investigation published by Asian Association for the Study of Diabetes (AASD) and John Wiley & Sons Australia, Ltd.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje