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Departments of Pediatrics, and Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio 44106-4948
A conditionally immortalized collecting tubule cell line, mCT1,
was derived from the H-2Kb-ts A58
transgenic mouse (ImmortoMouse), which harbors a temperature-sensitive mutant of the SV40 large T antigen oncogene. Cells maintained under
permissive conditions [33°C with interferon-
(IFN-
)] form epithelial monolayers, express large T antigen,
and proliferate (>50 passages). The cells retain properties
characteristic of the renal collecting tubule (CT) including:
vasopressin (VP)-stimulated cAMP accumulation, aquaporin-2 expression,
high transepithelial electrical resistance, VP-stimulated ion
transport, and amiloride-sensitive sodium absorption. When the cells
are transferred to nonpermissive conditions (39°C without IFN-
),
the steady-state level of large T antigen protein declines (>95%
decrease) and cell proliferation is arrested. This conditionally
immortalized, murine renal cell line should prove useful for studies of
CT physiology and large T antigen biology.
SV40 large T antigen; temperature sensitivity; chloride secretion; sodium absorption; amiloride; vasopressin; aquaporin-2
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