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The effects of low-level laser irradiation on differentiation and proliferation of human bone marrow mesenchymal stem cells into neurons and osteoblasts—an in vitro study

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Abstract

Bone marrow-derived mesenchymal stem cells (BMSCs) are promising for use in regenerative medicine. Several studies have shown that low-level laser irradiation (LLLI) could affect the differentiation and proliferation of MSCs. The aim of this study was to examine the influence of LLLI at different energy densities on BMSCs differentiation into neuron and osteoblast. Human BMSCs were cultured and induced to differentiate to either neuron or osteoblast in the absence or presence of LLLI. Gallium aluminum arsenide (GaAlAs) laser irradiation (810 nm) was applied at days 1, 3, and 5 of differentiation process at energy densities of 3 or 6 J/cm2 for BMSCs being induced to neurons, and 2 or 4 J/cm2 for BMSCs being induced to osteoblasts. BMSCs proliferation was evaluated by MTT assay on the seventh day of differentiation. BMSCs differentiation to neurons was assessed by immunocytochemical analysis of neuron-specific enolase on the seventh day of differentiation. BMSCs differentiation to osteoblast was tested on the second, fifth, seventh, and tenth day of differentiation via analysis of alkaline phosphatase (ALP) activity. LLLI promoted BMSCs proliferation significantly at all energy densities except for 6 J/cm2 in comparison to control groups on the seventh day of differentiation. LLLI at energy densities of 3 and 6 J/cm2 dramatically facilitated the differentiation of BMSCs into neurons (p < 0.001). Also, ALP activity was significantly enhanced in irradiated BMSCs differentiated to osteoblast on the second, fifth, seventh, and tenth day of differentiation (p < 0.001 except for the second day). Using LLLI at 810 nm wavelength enhances BMSCs differentiation into neuron and osteoblast in the range of 2–6 J/cm2, and at the same time increases BMSCs proliferation (except for 6 J/cm2). The effect of LLLI on differentiation and proliferation of BMSCs is dose-dependent. Considering these findings, LLLI could improve current in vitro methods of differentiating BMSCs prior to transplantation.

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Acknowledgments

We are grateful to Tehran University Medical Laser Research Center for providing us the laser device. This research was supported by Tarbiat Modares University.

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Authors and Affiliations

  1. Department of Hematology, Faculty of Medical Science, Tarbiat Modares University, Tehran, Iran

    Masoud Soleimani

  2. Department of Ophthalmology, Labbafinejad Hospital, Shaheed Beheshti Medical University, Tehran, Iran

    Ehsan Abbasnia

  3. Department of Plastic Surgery, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran

    Mehdi Fathi

  4. Faculty of Medicine and Applied Neuroscience Research Center, Baqyatallah (a.s.) Medical Sciences University, Tehran, Iran

    Hedayat Sahraei & Gholamreza Kaka

  5. Tehran University Medical Laser Research Center, Tehran University of Medical Sciences, Tehran, Iran

    Yashar Fathi

Authors
  1. Masoud Soleimani
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  2. Ehsan Abbasnia
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  3. Mehdi Fathi
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  4. Hedayat Sahraei
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  5. Yashar Fathi
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  6. Gholamreza Kaka
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Correspondence to Gholamreza Kaka.

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Soleimani, M., Abbasnia, E., Fathi, M. et al. The effects of low-level laser irradiation on differentiation and proliferation of human bone marrow mesenchymal stem cells into neurons and osteoblasts—an in vitro study. Lasers Med Sci 27, 423–430 (2012). https://doi.org/10.1007/s10103-011-0930-1

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  • DOI: https://doi.org/10.1007/s10103-011-0930-1

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