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Journal Article
Research Support, Non-U.S. Gov't
Molecular and biological characterization of vascular endothelial growth factor of parapoxviruses isolated from wild Japanese serows (Capricornis crispus).
Veterinary Microbiology 2010 January 7
Contagious dermatitis in domestic and wild ruminants caused by parapoxvirus (PPV) occurs worldwide. Although PPV infections appear in cattle, sheep and goats, the papular, nodular, pustular and ulcerated skin lesions of wild Japanese serows (Capricornis crispus) are significantly more severe than those of other animals. To determine the factors involved in the severity of these skin lesions, we compared the molecular characteristics of 4 PPV isolates from Japanese serows and 2 isolates from sheep in Japan, and also investigated the biological properties of primary endothelial cells from different host species. All of the 6 Japanese isolates harbored a vascular endothelial growth factor (VEGF) gene, which is known as one of the virulence factors of PPVs. Three different amino acid sequences of viral VEGF were identified and the sequence was identical among the 4 isolates from the Japanese serows. The temporal expression pattern of viral VEGF mRNA was almost the same among 3 isolates encoding the 3 different VEGFs in infected cells from different host species. Recombinant forms of the 3 different VEGFs showed the ability to induce vascular permeability and endothelial cell proliferation. Primary endothelial cells from Japanese serows were most responsive to recombinant viral VEGF compared to cells from cattle, sheep, and goats. These results suggest that not only the biological activity of viral VEGF but also the high responsiveness to viral VEGF of endothelial cells might be involved in the severe proliferative skin lesions induced by PPV infection in Japanese serows.
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