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Primary milk epithelial cells were isolated from CAEV-uninfected goats and three cell lines designated TIGMEC-1, TIGMEC-2 and TIGMEC-3 were established. The three cell lines retained their morphological characteristics of epithelial cells and expressed specific epithelial cytokeratin marker as well as the immortalizing SV40 large T antigen. The kinetics of growth of TIGMEC1, TIGMEC2 and TIGMEC3 cell lines showed a doubling time of 24-48 hours while the parental cell lines became senescent after the passage 6 in cell culture. Like the parental primary cells, the three cell lines were found to be highly sensitive to CAEV-pBSCA, an infectious molecular clone of CAEV-CO strain, and to a French isolate CAEV-3112. TIGMEC cell lines infected with CAEV-pBSCA became chronically infected producing high virus titers in absence of cytopathic effects. These cell lines may be useful for study of the possible physiological alterations in mammary epithelial cells infected with small ruminant lentiviruses and their consequences on milk quality. On an other hand, these cell lines can be used to study their role in virus transmission and pathogenesis.

Immortalized goat milk epithelial cell lines replicate CAEV at high level