Ghrelin inhibits in vitro angiogenic activity of rat brain microvascular endothelial cells

  • Authors:
    • Silvia Baiguera
    • Maria Terresa Conconi
    • Diego Guidolin
    • Giuseppina Mazzocchi
    • Ludwik K. Malendowicz
    • Pier Paolo Parnigotto
    • Raffaella Spinazzi
    • Gastone G. Nussdorfer
  • View Affiliations

  • Published online on: November 1, 2004     https://doi.org/10.3892/ijmm.14.5.849
  • Pages: 849-854
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Abstract

Ghrelin, a 28-amino acid peptide originally isolated from rat stomach, is an endogenous ligand of the growth hormone secretagogue receptor (GHS-R). Evidence has been provided that ghrelin and GHS-Rs are highly expressed in the cardiovascular system, including endothelial cells (ECs), of which they regulate the growth in vitro. It, therefore, seemed worthwhile to investigate the effect of ghrelin on in vitro angiogenesis, using cultures of rat ECs derived from brain microvessels (neuromicrovascular ECs, NECs). ECs, when cultured on a supportive matrix, form a network of tubule-like structures, and such process is enhanced by the classic angiogenic factors, including fibroblast growth factor-2 (FGF-2). After seeding on Matrigel-coated wells, NECs formed within 18 h a meshwork of capillary-like structures; vinblastine (2x10−12 M) disrupted the meshwork, while FGF-2 (50 ng/ml) increased its density. Ghrelin (10−8 M) exerted a vinblastine-like effect and counteracted the stimulatory action of FGF-2. Computerized image-analysis confirmed these observations. FGF-2 enhanced the proliferation rate and lowered the apoptotic rate of NECs cultured on plastic wells, and ghrelin exerted opposite effects and completely reversed the proliferogenic and antiapoptotic actions of FGF-2. In contrast to vinblastine, ghrelin did not increase lactate dehydrogenase release from cultured NECs, thereby ruling out the possibility that its effects may ensue from an aspecific cytotoxic action. FGF-2 enhanced tyrosine kinase (TK) and mitogen activated protein kinase (MAPK) p42/p44 activities of NECs. Ghrelin significantly decreased TK and MAPK p42/p44 activities and effectively counteracted the effect of FGF-2. Taken together, the present findings indicate that ghrelin exerts a marked in vitro antiangiogenic action, and that the mechanism underlying this effect involves the inhibition of TK/MAPK-dependent cascades.

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November 2004
Volume 14 Issue 5

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Baiguera S, Conconi MT, Guidolin D, Mazzocchi G, Malendowicz LK, Parnigotto PP, Spinazzi R and Nussdorfer GG: Ghrelin inhibits in vitro angiogenic activity of rat brain microvascular endothelial cells. Int J Mol Med 14: 849-854, 2004
APA
Baiguera, S., Conconi, M.T., Guidolin, D., Mazzocchi, G., Malendowicz, L.K., Parnigotto, P.P. ... Nussdorfer, G.G. (2004). Ghrelin inhibits in vitro angiogenic activity of rat brain microvascular endothelial cells. International Journal of Molecular Medicine, 14, 849-854. https://doi.org/10.3892/ijmm.14.5.849
MLA
Baiguera, S., Conconi, M. T., Guidolin, D., Mazzocchi, G., Malendowicz, L. K., Parnigotto, P. P., Spinazzi, R., Nussdorfer, G. G."Ghrelin inhibits in vitro angiogenic activity of rat brain microvascular endothelial cells". International Journal of Molecular Medicine 14.5 (2004): 849-854.
Chicago
Baiguera, S., Conconi, M. T., Guidolin, D., Mazzocchi, G., Malendowicz, L. K., Parnigotto, P. P., Spinazzi, R., Nussdorfer, G. G."Ghrelin inhibits in vitro angiogenic activity of rat brain microvascular endothelial cells". International Journal of Molecular Medicine 14, no. 5 (2004): 849-854. https://doi.org/10.3892/ijmm.14.5.849