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Duan L, Calhoun SJ, Perez RE, Macias V, Mir F, Gattuso P, Maki CG. Prolylcarboxypeptidase promotes IGF1R/HER3 signaling and is a potential target to improve endocrine therapy response in estrogen receptor positive breast cancer. Cancer Biol Ther 2022; 23:1-10. [PMID: 36332175 PMCID: PMC9639567 DOI: 10.1080/15384047.2022.2142008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Prolylcarboxypeptidase (PRCP) is a lysosomal serine protease that cleaves peptide substrates when the penultimate amino acid is proline. Previous studies have linked PRCP to blood-pressure and appetite control through its ability to cleave peptide substrates such as angiotensin II and α-MSH. A potential role for PRCP in cancer has to date not been widely appreciated. Endocrine therapy resistance in breast cancer is an enduring clinical problem mediated in part by aberrant receptor tyrosine kinase (RTK) signaling. We previously found PRCP overexpression promoted 4-hydroxytamoxifen (4-OHT) resistance in estrogen receptor-positive (ER+) breast cancer cells. Currently, we tested the potential association between PRCP with breast cancer patient outcome and RTK signaling, and tumor responsiveness to endocrine therapy. We found high PRCP protein levels in ER+ breast tumors associates with worse outcome and earlier recurrence in breast cancer patients, including patients treated with TAM. We found a PRCP specific inhibitor (PRCPi) enhanced the response of ER+ PDX tumors and MCF7 tumors to endoxifen, an active metabolite of TAM in mice. We found PRCP increased IGF1R/HER3 signaling and AKT activation in ER+ breast cancer cells that was blocked by PRCPi. Thus, PRCP is an adverse prognostic marker in breast cancer and a potential target to improve endocrine therapy in ER+ breast cancers.
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Affiliation(s)
- Lei Duan
- Department of Anatomy and Cell biology, Rush University Medical Center, Chicago, IL, 60612, USA,CONTACT Lei Duan
| | - Sarah J. Calhoun
- Department of Anatomy and Cell biology, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Ricardo E. Perez
- Department of Anatomy and Cell biology, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Virgilia Macias
- Department of Pathology, University of Illinois at Chicago, Chicago, IL, 60612, USA
| | - Fatima Mir
- Department of Pathology, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Paolo Gattuso
- Department of Pathology, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Carl G. Maki
- Department of Anatomy and Cell biology, Rush University Medical Center, Chicago, IL, 60612, USA,Carl G. Maki Department of Anatomy and Cell biology, Rush University Medical Center, 1705 W Harrison St, Jelke Bldg R1306, Chicago, IL, 60612, USA
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