Takezawa S, Maezawa M, Tsuzuku S, Kawakami J, Oouci Y, Inokuma H. Abnormal clonalities of B-lymphocytes in bovine leukemia virus-infected cattle with persistent lymphocytosis.
J Vet Med Sci 2021;
83:1928-1932. [PMID:
34719608 PMCID:
PMC8762424 DOI:
10.1292/jvms.21-0357]
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Abstract
Peripheral B-lymphocyte clonality of 274 bovine leukemia virus-infected cattle with
lymphocytosis was analyzed using clonality PCR based on sequences of the variable region
of the bovine immunoglobulin H chain. None of the cattle showed monoclonal proliferation,
while 10, 31, and 233 showed minor-clonal, oligoclonal, and polyclonal proliferation,
respectively. A total of 163 cattle were analyzable the following year, and lymphocytosis
was maintained in 157, indicating persistent lymphocytosis (PL). B-lymphocyte clonality of
the 157 PL cattle was minor-clonal in 6 (3.8%), oligoclonal in 8 (5.1%), and polyclonal in
143 (91.1%). A higher rate of enzootic bovine leukosis (EBL) onset within a year was
observed in PL cattle with minor-clonal (50.0% (3/6)) and oligoclonal (25.0% (2/8))
proliferation compared to those with polyclonal (5.6% (8/143)) proliferation. Minor-clonal
and oligoclonal proliferation in PL cattle may be a prognosis factor for developing
EBL.
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