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Protective Effects of Vasoactive Intestinal Peptide (VIP) in Ischemic Retinal Degeneration

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Abstract

Vasoactive intestinal peptide (VIP) is a pleiotropic neuropeptide, acting as a neuromodulator and neuroprotective peptide in the CNS after injuries. We have previously described that pituitary adenylate cyclase-activating polypeptide (PACAP), another member of the same peptide family, is retinoprotective in ischemic lesions. The aim of this study was to investigate the protective potential of VIP in bilateral common carotid artery occlusion (BCCAO)-induced ischemic retinal lesion. Two-month-old rats were subjected to BCCAO and treated with intravitreal VIP injection. Their retinas were processed for histology after 2 weeks of survival. We measured the number of the cells/100 μm of the ganglion cell layer and the thickness of each layer such as the outer nuclear, outer plexiform, inner nuclear, and inner plexiform layers as well as that of the whole retina. We found that treatment with 1,000 pmol VIP, but not 100 pmol VIP, had significant protective effects in BCCAO-injured retina, as shown by the morphometric analysis. Comparing the neuroprotective effects of VIP and PACAP in BCCAO-operated retinas, PACAP was more effective, already protective at 100-pmol doses. Similar to other studies, we found that VIP must be given at least in 10 times more concentration than PACAP to achieve a similar degree of neuroprotection in the retina.

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Acknowledgments

This work was supported by OTKA 100144, K72592, CNK78480, Richter Gedeon Centenary Foundation, SROP 4.1.2.B-10/2/KONV-20/0-0002, SROP-4.2.2/B-10/1-2010-0029, Momentum-Program of the Hungarian Academy of Sciences, Arimura Foundation. The authors thank Aniko Kiss for her technical assistance.

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Authors and Affiliations

  1. Department of Experimental Zoology and Neurobiology, University of Pecs, Pecs, Hungary

    K. Szabadfi & R. Gabriel

  2. Department of Anatomy, PTE-MTA Lendulet PACAP Research Group, University of Pecs, Pecs, Hungary

    B. Danyadi, P. Kiss, A. Tamas, E. Fabian & D. Reglodi

Authors
  1. K. Szabadfi
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  2. B. Danyadi
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  3. P. Kiss
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  4. A. Tamas
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  5. E. Fabian
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  6. R. Gabriel
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  7. D. Reglodi
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Correspondence to K. Szabadfi.

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Szabadfi, K., Danyadi, B., Kiss, P. et al. Protective Effects of Vasoactive Intestinal Peptide (VIP) in Ischemic Retinal Degeneration. J Mol Neurosci 48, 501–507 (2012). https://doi.org/10.1007/s12031-012-9774-9

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  • DOI: https://doi.org/10.1007/s12031-012-9774-9

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