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Effects of low-level laser irradiation on mesenchymal stem cell proliferation: a microarray analysis

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Abstract

Increased proliferation after low-level laser irradiation (LLLI) has been well demonstrated in many cell types including mesenchymal stem cells (MSCs), but the exact molecular mechanisms involved remain poorly understood. The aim of this study was to investigate the change in mRNA expression in rat MSCs after LLLI and to reveal the associated molecular mechanisms. MSCs were exposed to a diode laser (635 nm) as the irradiated group. Cells undergoing the same procedure without LLLI served as the control group. Proliferation was evaluated using the MTS assay. Differences in the gene expression profiles between irradiated and control MSCs at 4 days after LLLI were analyzed using a cDNA microarray. Gene ontology and pathway analysis were used to find the key regulating genes followed by real-time PCR to validate seven representative genes from the microarray assays. This procedure identified 119 differentially expressed genes. Real-time PCR confirmed that the expression levels of v-akt murine thymoma viral oncogene homolog 1 (Akt1), the cyclin D1 gene (Ccnd1) and the phosphatidylinositol 3-kinase, catalytic alpha polypeptide gene (Pik3ca) were upregulated after LLLI, whereas those of protein tyrosine phosphatase non-receptor type 6 (Ptpn6) and serine/threonine kinase 17b (Stk17b) were downregulated. cDNA microarray analysis revealed that after LLLI the expression levels of various genes involved in cell proliferation, apoptosis and the cell cycle were affected. Five genes, including Akt1, Ptpn6, Stk17b, Ccnd1 and Pik3ca, were confirmed and the PI3K/Akt/mTOR/eIF4E pathway was identified as possibly playing an important role in mediating the effects of LLLI on the proliferation of MSCs.

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Acknowledgments

This study was supported by the Natural Science Foundation of China (81070099) and Fok Ying-tong Education Foundation (121041). The authors thank Mr. Michael Zhao of the University of California, San Diego, for his excellent language editing.

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Authors and Affiliations

  1. Department of Surgery, Cardiovascular Institute & Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 167 Beilishi Road, Bei**g, 100037, China

    Yi-he Wu, Jue Wang, Ding-xu Gong, Hai-yong Gu, Sheng-shou Hu & Hao Zhang

  2. State Key Laboratory of Cardiovascular Medicine, Cardiovascular Institute & Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Bei**g, China

    Yi-he Wu, Jue Wang, Ding-xu Gong, Hai-yong Gu, Sheng-shou Hu & Hao Zhang

  3. Research Center for Cardiac Regenerative Medicine of the Ministry of Health, Cardiovascular Institute & Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Bei**g, China

    Yi-he Wu, Jue Wang, Ding-xu Gong, Hai-yong Gu, Sheng-shou Hu & Hao Zhang

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  1. Yi-he Wu
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Correspondence to Hao Zhang.

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Wu, Yh., Wang, J., Gong, Dx. et al. Effects of low-level laser irradiation on mesenchymal stem cell proliferation: a microarray analysis. Lasers Med Sci 27, 509–519 (2012). https://doi.org/10.1007/s10103-011-0995-x

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