Differential Expression of Speckled POZ Protein, SPOP: Putative Regulation by MiR-145

Overview

Journal J Biosci

Specialties Biochemistry
Biology

Date 2014 May 22

PMID 24845504

Citations 8

Authors

Chiu-Jung Huang

Hsing-Yu Chen

Wan-Yi Lin

Kong Bung Choo

Affiliations

Soon will be listed here.

Abstract

The speckle POZ protein, SPOP, is an adaptor of the Cul3-based ubiquitination process, and has been implicated in the carcinogenesis process. Despite recent elucidation of biological functions, regulation of SPOP gene expression has not been reported. In this study, the mRNA levels of the mouse SPOP (mSPOP) gene were first shown to vary noticeably in different tissues. However, the SPOP protein was detected in high abundance only in Purkinje cells of the cerebellum and seminiferous tubule of the testis, echoing previous reports of involvement of ubiquitination in neuron cells and in spermatogenesis. In other mouse tissues and human cancer cell lines analysed, only low SPOP protein levels were detected. The 3'-untranslated regions of both the mSPOP and human SPOP transcripts harbor a conserved putative miR-145 binding site (BS). In some tissues and cell lines, miR-145 and SPOP protein levels were in an inverse relationship suggesting miR-145 regulation. Luciferase assays of deletion and point mutation constructs of the miR-145 BS, and miR-145 induction by serum starvation that resulted in reduced endogenous SPOP levels provided further evidence that miR-145 is likely involved in post-transcriptional regulation of SPOP expression in selected tissues, and possibly with the participation of other miRNA species.

Citing Articles

SPOP loss of function protects against tauopathy.

Eck R, Kow R, Black A, Liachko N, Kraemer B Proc Natl Acad Sci U S A. 2022; 120(1):e2207250120.

PMID: 36574656 PMC: 9910588. DOI: 10.1073/pnas.2207250120.

SPOP in Cancer: Phenomena, Mechanisms and Its Role in Therapeutic Implications.

Yang X, Zhu Q Genes (Basel). 2022; 13(11).

PMID: 36360288 PMC: 9690554. DOI: 10.3390/genes13112051.

c-Myb facilitates immune escape of esophageal adenocarcinoma cells through the miR-145-5p/SPOP/PD-L1 axis.

Zhang L, Wang X, Li Y, Han J, Gao X, Li S Clin Transl Med. 2021; 11(9):e464.

PMID: 34586738 PMC: 8473478. DOI: 10.1002/ctm2.464.

SPOP Deregulation Improves the Radiation Response of Prostate Cancer Models by Impairing DNA Damage Repair.

El Bezawy R, Tripari M, Percio S, Cicchetti A, Tortoreto M, Stucchi C Cancers (Basel). 2020; 12(6).

PMID: 32512734 PMC: 7352729. DOI: 10.3390/cancers12061462.

The diverse roles of SPOP in prostate cancer and kidney cancer.

Wang Z, Song Y, Ye M, Dai X, Zhu X, Wei W Nat Rev Urol. 2020; 17(6):339-350.

PMID: 32355326 DOI: 10.1038/s41585-020-0314-z.

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