Poly r(C) binding protein (PCBP) 1 expression is regulated at the post-translation level in thyroid carcinoma.
Poly r(C) binding protein (PCBP) 1 or heterogeneous ribonucleoprotein (hnRNP) E1 is a RNA binding protein that plays a vital role in a wide variety of biological processes. PCBP1 has been shown to function as a tumor suppressor by negatively regulating translation of pro-metastatic proteins in different cancers. Loss ofPCBP1expression or its Akt2-mediated phosphorylation at serine 43 residue has both been indicated to de-repress its regulation of EMT inducer proteins. Our previous work has established thatPCBP1functions as a tumor suppressor in thyroid cancer, where its translation is inhibited by microRNA-490-3p. Here we show that thyroid cancer patients can be divided into 2 cohorts based on miR-490-3p expression andPCBP1mRNA expression-one cohort with highPCBP1mRNA expression and basal miR-490-3p expression and a second cohort with lowPCBP1mRNA expression and high miR-490-3p expression. However, PCBP1 protein expression is also downregulated in the cohort with high PCBP1 mRNA expression, with expression levels similar to what is observed in patients with the low PCBP1 mRNA expression. Our analysis shows thatPCBP1mRNA is actively translated in patients with highPCBP1mRNA expression, but that the protein is post translationally degraded by the proteasome machinery. Our results thus elucidate a novel mechanism responsible for down regulation of PCBP1 expression in thyroid cancer. It will be important in future to identify the mechanism that causes degradation of PCBP1 protein and to identify if similar mechanisms are active in other tumors characterized by low PCBP1 protein expression.
Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute Tianjin 300052, China.
Ming-Peng
MP
Zhang
Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute Tianjin 300052, China.
Wei-San
WS
Zhang
Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute Tianjin 300052, China.
Jin
J
Tan
Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute Tianjin 300052, China.
Ming-Hui
MH
Zhao
Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute Tianjin 300052, China.
Lin-Juan
LJ
Lian
Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute Tianjin 300052, China.
Jie
J
Cai
Poly r(C) binding protein; miR-490-3p; thyroid carcinoma