Abstract
Plasma IGF-I concentrations and IGF-I receptor binding on mononuclear cells have been studied on bovine leukemia virus (BLV)-negative (CO), BLV-infected aleukemic (AL) cows or cows with persistent lymphocytosis (PL). No significant differences in plasma IGF-I concentrations were demonstrated among the three groups of animals. However, a linear negative correlation existed between the number of circulating mononuclear cells and the number of IGF-I binding sites on these cells from control cows. In addition, mononuclear cells from PL cows had fewer IGF-I binding sites per cell when compared with control cows. These results suggest involvement of IGF-I in etiology of BLV infection and progression and warrant further studies to establish whether IGF-I plays a major physiological role in these conditions.
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