Identification of Potential mRNA Biomarkers in Milk Small Extracellular Vesicles of Enzootic Bovine Leukosis Cattle

• Published in: Viruses Vol. 14; no. 5; p. 1022
• Main Authors: Hiraoka, Mami, Takashima, Shigeo, Wakihara, Yoshiko, Kamatari, Yuji O, Shimizu, Kaori, Okada, Ayaka, Inoshima, Yasuo
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 11-05-2022; MDPI
• Subjects: Agriculture; Analysis; Animals; Antibodies; Biological markers; biomarker; Biomarkers; Blood tests; bovine leukemia virus; Bovine leukosis; bovine milk; Cancer; Care and treatment; Cattle; Cell growth; Dairy cattle; Dairy farms; Diagnosis; DNA microarrays; Enzootic Bovine Leukosis; Extracellular Vesicles; Genetic aspects; Hematology; Hygiene; Infectious diseases; LAPTm5 protein; Leukemia Virus, Bovine - genetics; Leukosis; Livestock; Lymphatic system; Lymphocytes; Lymphocytes B; Lymphosarcoma; Messenger RNA; Milk; mRNA; Nanoparticles; RNA, Messenger - genetics; small extracellular vesicles; Testing; Veterinarians; Japan; mRNA; small extracellular vesicles; biomarker; bovine leukemia virus; bovine milk
• ISSN: 1999-4915; 1999-4915
• DOI: 10.3390/v14051022

Enzootic bovine leukosis (EBL) is a disease caused by bovine leukemia virus (BLV); only a small percentage of BLV-infected cattle develop EBL and present with B-cell lymphosarcoma. There is no vaccine against BLV, treatment for EBL, or method for predicting the possibility of EBL onset, thus making EBL control difficult. Herein, to explore biomarkers for EBL in milk, we examined the mRNA profiles of small extracellular vesicles (sEVs) in milk from four BLV-uninfected and four EBL cattle by microarray analysis. It was revealed that 14 mRNAs were encapsulated in significantly higher quantities, and these mRNAs were therefore selected as biomarker candidates. Primers for these mRNAs were designed, and nine primer sets were available for quantitative real-time PCR. Nine mRNAs were evaluated for their availability as biomarkers for EBL using sEVs from newly-collected milk of 7 uninfected and 10 EBL cattle. The quantities of eight mRNAs (
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were significantly higher in milk sEVs of EBL cattle than in those of uninfected cattle. Therefore, our findings indicate that these eight mRNAs in milk sEVs can be used as potential EBL biomarkers with combination use, although single mRNA use is not enough. Consequently, cattle at risk of EBL onset can be identified by monitoring the fluctuation in quantities of these mRNAs in milk before they develop EBL.