MCAM Mediates Chemoresistance in Small-Cell Lung Cancer via the PI3K/AKT/SOX2 Signaling Pathway.

Abstract:

:Despite favorable responses to initial therapy, small-cell lung cancer (SCLC) relapse occurs within a year and exhibits resistance to multiple drugs. Because of limited accessibility of patient tissues for research purposes, SCLC patient-derived xenografts (PDX) have provided the best opportunity to address this limitation. Here, we sought to identify novel mechanisms involved in SCLC chemoresistance. Through in-depth proteomic profiling, we identified MCAM as a markedly upregulated surface receptor in chemoresistant SCLC cell lines and in chemoresistant PDX compared with matched treatment-naïve tumors. MCAM depletion in chemoresistant cells reduced cell proliferation and reduced the IC50 inhibitory concentration of chemotherapeutic drugs in vitro This MCAM-mediated sensitization to chemotherapy occurred via SOX2-dependent upregulation of mitochondrial 37S ribosomal protein 1/ATP-binding cassette subfamily C member 1 (MRP1/ABCC1) and the PI3/AKT pathway. Metabolomic profiling revealed that MCAM modulated lactate production in chemoresistant cells that exhibit a distinct metabolic phenotype characterized by low oxidative phosphorylation. Our results suggest that MCAM may serve as a novel therapeutic target to overcome chemoresistance in SCLC. Cancer Res; 77(16); 4414-25. ©2017 AACR.

journal_name

Cancer Res

journal_title

Cancer research

authors

Tripathi SC,Fahrmann JF,Celiktas M,Aguilar M,Marini KD,Jolly MK,Katayama H,Wang H,Murage EN,Dennison JB,Watkins DN,Levine H,Ostrin EJ,Taguchi A,Hanash SM

doi

10.1158/0008-5472.CAN-16-2874

subject

Has Abstract

pub_date

2017-08-15 00:00:00

pages

4414-4425

issue

16

eissn

0008-5472

issn

1538-7445

pii

0008-5472.CAN-16-2874

journal_volume

77

pub_type

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