All-trans Retinoic Acid Arrests Cell Cycle in Leukemic Bone Marrow Stromal Cells by Increasing Intercellular Communication Through Connexin 43-mediated Gap Junction

Overview

Journal J Hematol Oncol

Publisher Biomed Central

Specialties Hematology
Oncology

Date 2015 Oct 9

PMID 26446715

Citations 9

Authors

Yao Liu

Qin Wen

Xue-Lian Chen

Shi-Jie Yang

Lei Gao

Li Gao

Cheng Zhang

Jia-Li Li

Xi-Xi Xiang

Kai Wan

Xing-hua Chen

Xi Zhang

Jiang-Fan Zhong

Affiliations

Soon will be listed here.

Abstract

Background: Gap junctional intercellular communication (GJIC) is typically decreased in malignant tumors. Gap junction is not presented between hematopoietic cells but occurred in bone marrow stromal cells (BMSCs). Connexin 43 (Cx43) is the major gap junction (GJ) protein; our previous study revealed that Cx43 expression and GJIC were decreased in acute leukemic BMSCs. All-trans retinoic acid (ATRA) increases GJIC in a variety of cancer cells and has been used to treat acute promyelocytic leukemia, but the effects of ATRA on leukemic BMSCs is unknown. In this study, we evaluated the potential effects of ATRA on cell cycle, proliferation, and apoptosis of leukemic BMSCs. Effects of ATRA on Cx43 expression and GJIC were also examined.

Methods: Human BMSCs obtained from 25 patients with primary acute leukemia, and 10 normal healthy donors were cultured. Effects of ATRA on cell cycle, cell proliferation, and apoptosis were examined with or without co-treatment with amphotericin-B. Cx43 expression was examined at both the mRNA and protein expression levels. GJIC was examined by using a dye transfer assay and measuring the rate of fluorescence recovery after photobleaching (FRAP).

Results: ATRA arrested the cell cycle progression, inhibited cell growth, and increased apoptosis in leukemic BMSCs. Both Cx43 expression and GJIC function were increased by ATRA treatment. Most of the observed effects mediated by ATRA were abolished by amphotericin-B pretreatment.

Conclusions: ATRA arrests cell cycle progression in leukemic BMSCs, likely due to upregulating Cx43 expression and enhancing GJIC function.

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