Home CONTACT Acta Virologica 2020 Acta Virologica Vol.64, No.4, p.451-456, 2020

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Founded: 1957
ISSN 0001-723X
E-ISSN 1336-2305

Published in English

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Acta Virologica Vol.64, No.4, p.451-456, 2020

Title: IFN-γ mRNA expression is lower in Holstein cows infected with bovine leukemia virus with high proviral load and persistent lymphocytosis
Author: C. Úsuga-Monroy, L. G. González Herrera, J. J. Echeverri Zuluaga, F. J. Díaz, A. López-Herrera

Abstract: Bovine leukemia virus (BLV) is a retrovirus that affects primarily milky cows. Animals serologically positive to BLV show a Th1 cytokine profile with a predominance of interferon gamma (IFN-γ). IFN-γ has antiviral activity through mechanisms such as resistance to infection, inhibition of viral replication and apoptosis. The objective of this work was to determine the transcription levels of IFN-γ and its relationship with proviral load and persistent lymphocytosis in a population of Holstein cows of the province of Antioquia, Colombia. IFN-γ transcription levels were evaluated by qPCR in 140 Holstein cows. A one-way analysis of variance and a Student's t test were used to evaluate the differences between the means. The amount of IFN-γ mRNA found in BLV-positive cows was lower than in BLV-negative cows. Moreover, in the group of infected cows a lower level of IFN-γ mRNA expression was found in BLV and persistent lymphocytosis cows (BLV+PL) compared with BLV and aleukemia cows (BLV+AL). The level of IFN-γ mRNA expression was lower in cows with high proviral load (HPL) compared to cows with low proviral load (LPL). BLV infection is related to abnormal expression of IFN-γ mRNA, although IFN-γ has antiviral activity, its expression is affected by high proviral load.

Keywords: cytokine; immune system; leukemia; bovine leukemia virus
Published online: 05-Nov-2020
Year: 2020, Volume: 64, Issue: 4 Page From: 451, Page To: 456

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