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Low-dose photodynamic therapy increases endothelial cell proliferation and VEGF expression in nude mice brain

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Abstract

We tested whether low-dose photodynamic therapy (PDT) induces an angiogenic response in the normal brain of nude mice (n=20). Normal brains of nude mice were subjected to PDT at low doses (Photofrin: 2 mg/kg; optical: 2 J/cm2 and 4 J/cm2). BrdU (50 mg/kg) was injected (intraperitoneally, i.p.) daily from PDT treatment to sacrifice (1 and 2 weeks after PDT). Laser scanning confocal microscopy, immunohistochemistry, and immunofluorescence staining were performed to assay angiogenic response. Morphological results show no significant tissue damage induced by PDT and two- and three-dimensional image analyses revealed no significant difference in vascular structure between the areas of exposure to PDT and contralateral areas in all mice. However, the number of BrdU immunoreactive cells were significantly increased in the areas of PDT treatment compared with contralateral hemisphere in both groups, and the number of BrdU-positive cells increased in a PDT-dose-dependent manner. Furthermore, immunohistochemical data indicate that PDT at these low doses significantly induces the expression of the vascular endothelial growth factor (VEGF) in PDT-treated regions in the 1-week group, but not in the 2-week group. These data indicate that low-dose PDT results in increased VEGF expression and endothelial cell proliferation in normal brains.

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Authors and Affiliations

  1. Neurology Department, Henry Ford Health Sciences Center, Henry Ford Hospital, 2799 West Grand Blvd., Detroit, MI, 48202, USA

    Xuepeng Zhang, Feng Jiang, Zheng Gang Zhang, Ana C. deCarvalho, Jieli Chen, Hongyan Yang, Adam M. Robin & Michael Chopp

  2. Physics Department, Oakland University, Rochester, MI, USA

    Michael Chopp

  3. Neurosurgery Department, Henry Ford Health Sciences Center, Henry Ford Hospital, Detroit, MI, USA

    Steven N Kalkanis & Xin Hong

  4. Institue for Neuroscience, University of Texas at Austin, Austin, TX, USA

    Hongyan Yang

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  1. Xuepeng Zhang
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  2. Feng Jiang
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  3. Zheng Gang Zhang
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  4. Steven N Kalkanis
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  5. Xin Hong
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  6. Ana C. deCarvalho
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  7. Jieli Chen
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  8. Hongyan Yang
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  9. Adam M. Robin
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  10. Michael Chopp
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Correspondence to Michael Chopp.

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Zhang, X., Jiang, F., Zhang, Z. et al. Low-dose photodynamic therapy increases endothelial cell proliferation and VEGF expression in nude mice brain. Lasers Med Sci 20, 74–79 (2005). https://doi.org/10.1007/s10103-005-0348-8

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  • DOI: https://doi.org/10.1007/s10103-005-0348-8

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