Establishing a papillary craniopharyngioma cell line by SV40LT-mediated immortalization.

BACKGROUND Craniopharyngioma represents a troublesome tumor of the intracranial sellar region. There are currently no available well-characterized craniopharyngioma cell lines. This lack of reliable, immortal cell lines is a major reason for the slow progress in fundamental research related to craniopharyngioma. METHODS We describe the development of an immortal papillary craniopharyngioma (PCP) cell line by transfecting primary PCP cells with the pLenti-simian virus 40 large T antigen(SV40LT). RESULTS Three clones have been cultured for more than 14 months so far, while non-transfected cells ceased proliferation within three months of isolation. The established immortal PCP cell lines were identified to have BRAFV600E mutations, while no mutations in tumor suppressor genes were found in primary cells or immortal cells. Immortal cells had higher proliferation rates and formed tumors when implanted in the bran of nude mice. BRAF inhibition in immortal PCP cells altered cell morphology, inhibited cell proliferation and promoted apoptosis. CONCLUSION We successfully developed PCP cell lines by SV40LT-mediated immortalization. These cell lines represent a powerful tool for fundamental and therapeutical studies on craniopharyngioma.