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GENETICALLY MODIFIED ANIMALS AND MODEL ORGANISMS

Deletion of one SERCA2 allele confers protection against bladder wall hypertrophy in a murine model of partial bladder outlet obstruction

The John W. Duckett Center for Pediatric Urology at The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania

Submitted 2 July 2007 ; accepted in final form 25 October 2007

The sarco(endo)plasmic reticulum Ca²⁺-ATPase2 (SERCA2) is downregulated in cardiac hypertrophy with decompensation. We sought to determine whether mice heterozygous for the SERCA2 allele would develop greater bladder hypertrophy and decompensation than their wild-type littermates following partial bladder outlet obstruction (pBOO). We found that following 4 wk of surgically created pBOO, SERCA2 heterozygous murine bladders showed significantly less hypertrophy, improved in vitro cystometry performance, diminished expression of the slow myosin isoform A analyzed by RT-PCR, a significant drop in nuclear translocation of nuclear factor of activated T cells by EMSA, and decreased cell proliferation within the smooth muscle layer following 5-bromo-2'-deoxyuridine labeling compared with their wild-type littermates. Thus, in contrast to cardiac muscle, deletion of a SERCA2 allele confers protection against bladder hypertrophy in a murine model of pBOO. Compensatory mechanisms in heterozygous mice seem to be related to the calcineurin pathway. Further studies are underway to better define the molecular basis of this observation, which has potential clinical applications.

urinary bladder; obstruction; sarco(endo)plasmic reticulum Ca²⁺-ATPase2; nuclear factor of activated T cells