GRK2 promotes growth of medulloblastoma cells and protects them from chemotherapy-induced apoptosis

Author:

Pathania Anup S.,Ren Xiuhai,Mahdi Min Y.,Shackleford Gregory M.,Erdreich-Epstein AnatORCID

Abstract

AbstractG-protein coupled receptor kinase 2 (GRK2; ADRBK1, BARK1) is most known as a regulator of G-protein coupled receptors. However, GRK2 also has other functions. Medulloblastomas are the most common malignant brain cancers in children. GRK2 has not been implicated in medulloblastoma biology. Here we report that GRK2 knockdown slowed cell growth, diminished proliferation, and enhanced cisplatin- and etoposide-induced apoptosis in medulloblastoma cell lines UW228-2 and Daoy. Reciprocally, GRK2 overexpression attenuated apoptosis induced by these chemotherapy drugs. Cisplatin and etoposide increased phosphorylation of AKT (S473) and GRK2 knockdown mitigated this increase. Cisplatin and etoposide attenuated ERK phosphorylation, but GRK2 knockdown did not alter this effect. Wildtype GRK2 reversed the increase in cisplatin- and etoposide-induced apoptosis caused by GRK2 knockdown. GRK2-K220R (kinase dead) and GRK2-S670A (unphosphorylated, constitutively active) conferred protection from cisplatin that was similar to wildtype GRK2, suggesting that this protection may be mediated though a kinase-independent activity of GRK2. These data demonstrate that GRK2 contributes to proliferation and survival of these medulloblastoma cell lines and to their protection from cisplatin- and etoposide-induced apoptosis.

Funder

U.S. Department of Health & Human Services | NIH | National Institute of Neurological Disorders and Stroke

Concern Foundation

T.J. Martell Foundation

Pediatric Cancer Research Foundation

Harriet H. Samuelsson Foundation

Nautica Malibu Triathlon Fund Barbara Mandel Family Fund Helen Dyess Pediatric Cancer Research Fund

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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