Original Article

Voltage-gated K+ channels in adipogenic differentiation of bone marrow-derived human mesenchymal stem cells

Authors: Mi-hyeon You, Min Seok Song, Seul Ki Lee, Pan Dong Ryu, So Yeong Lee, Dae-yong Kim
DOI: 10.1038/aps.2012.142


Mi-hyeon YOU1, Min Seok SONG2, Seul Ki LEE2, Pan Dong RYU2, So Yeong LEE2, *

Laboratory of 1Veterinary Pathology and 2Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, 151–742, Korea

Aim: To determine the presence of voltage-gated K+ (Kv) channels in bone marrow-derived human mesenchymal stem cells (hMSCs) and their impact on differentiation of hMSCs into adipocytes.

Methods: For adipogenic differentiation, hMSCs were cultured in adipogenic medium for 22 d. The degrees of adipogenic differentiation were examined using Western blot, Oil Red O staining and Alamar assay. The expression levels of Kv channel subunits Kv1.1, Kv1.2, Kv1.3, Kv1.4, Kv2.1, Kv3.1, Kv3.3, Kv4.2, Kv4.3, and Kv9.3 in the cells were detected using RT-PCR and Western blot analysis.

Results: The expression levels of Kv2.1 and Kv3.3 subunits were markedly increased on d 16 and 22. In contrast, the expression levels of other Kv channel subunits, including Kv1.1, Kv1.2, Kv1.3, Kv1.4, Kv4.2, Kv4.3, and Kv9.3, were decreased as undifferentiated hMSCs differentiated into adipocytes. Addition of the Kv channel blocker tetraethylammonium (TEA, 10 mmol/L) into the adipogenic medium for 6 or 12 d caused a significant decrease, although not complete, in lipid droplet formation and adipocyte fatty acid-binding protein 2 (aP2) expressions. Addition of the selective Kv2.1 channel blocker guangxitoxin (GxTX-1, 40 nmol/L) into the adipogenic medium for 21 d also suppressed adipogenic differentiation of the cells.

Conclusion: The results demonstrate that subsets of Kv channels including Kv2.1 and Kv3.3 may play an important role in the differentiation of hMSCs into adipocytes.

Keywords: human mesenchymal stem cells; adipogenic differentiation; voltage-gated K+ channels; Kv2.1; Kv3.3; TEA; GxTX-1

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0014514).
* To whom correspondence should be addressed.
E-mail daeyong@snu.ac.kr (Dae-yong KIM); leeso@snu.ac.kr (So Yeong LEE)
Received 2012-01-20 Accepted 2012-09-18

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