Bladder injection of "naked" hSlo/pcDNA3 ameliorates detrusor hyperactivity in obstructed rats in vivo

G. J. Christ, N. S. Day, M. Day, C. Santizo, W. Zhao, T. Sclafani, J. Zinman, K. Hsieh, K. Venkateswarlu, M. Valcic, A. Melman

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The goal of these studies was to examine the potential utility of bladder instilled K+ channel gene therapy with hSlo cDNA (i.e., the maxi-K channel) to ameliorate bladder overactivity in a rat model of partial urinary outlet obstruction. Twenty-two female Sprague-Dawley rats were subjected to partial urethral (i.e., outlet) obstruction, with 17 sham-operated control rats run in parallel. After 6 wk of obstruction, suprapubic catheters were surgically placed in the dome of the bladder in all rats. Twelve obstructed rats received bladder instillation of 100 μg of hSlo/pcDNA in 1 ml PBS during catheterization, and another 10 obstructed rats received 1 ml PBS (7 rats) or 1 ml PBS containing pcDNA only (3 rats). Two days after surgery cystometry was performed on all animals to examine the characteristics of the micturition reflex in conscious and unrestrained rats. Obstruction was associated with a three-to fourfold increase in bladder weight and alterations in virtually every micturition parameter estimate. PBS-injected obstructed rats routinely displayed spontaneous bladder contractions between micturitions. In contrast, hSlo injection eliminated the obstruction-associated bladder hyperactivity, without detectably affecting any other cystometric parameter. Presumably, expression of hSlo in rat bladder functionally antagonizes the increased contractility normally observed in obstructed animals and thereby ameliorates bladder overactivity. These initial observations indicate a potential utility of gene therapy for urinary incontinence.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume281
Issue number5 50-5
StatePublished - 2001

Fingerprint

Urinary Bladder
Injections
Urination
Genetic Therapy
Catheter Obstruction
Large-Conductance Calcium-Activated Potassium Channels
Intravesical Administration
Urinary Incontinence
Ambulatory Surgical Procedures
Catheterization
Sprague Dawley Rats
Reflex
Complementary DNA
Weights and Measures

Keywords

  • Potassium channels
  • Smooth muscle

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Bladder injection of "naked" hSlo/pcDNA3 ameliorates detrusor hyperactivity in obstructed rats in vivo. / Christ, G. J.; Day, N. S.; Day, M.; Santizo, C.; Zhao, W.; Sclafani, T.; Zinman, J.; Hsieh, K.; Venkateswarlu, K.; Valcic, M.; Melman, A.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 281, No. 5 50-5, 2001.

Research output: Contribution to journalArticle

Christ, GJ, Day, NS, Day, M, Santizo, C, Zhao, W, Sclafani, T, Zinman, J, Hsieh, K, Venkateswarlu, K, Valcic, M & Melman, A 2001, 'Bladder injection of "naked" hSlo/pcDNA3 ameliorates detrusor hyperactivity in obstructed rats in vivo', American Journal of Physiology - Regulatory Integrative and Comparative Physiology, vol. 281, no. 5 50-5.
Christ, G. J. ; Day, N. S. ; Day, M. ; Santizo, C. ; Zhao, W. ; Sclafani, T. ; Zinman, J. ; Hsieh, K. ; Venkateswarlu, K. ; Valcic, M. ; Melman, A. / Bladder injection of "naked" hSlo/pcDNA3 ameliorates detrusor hyperactivity in obstructed rats in vivo. In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology. 2001 ; Vol. 281, No. 5 50-5.
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