Journal of Pharmacological Sciences (Jan 2007)

Methyl-β-cyclodextrin Prevents Ca2+-Induced Ca2+ Release in Smooth Muscle Cells of Mouse Urinary Bladder

  • Shingo Hotta,
  • Hisao Yamamura,
  • Susumu Ohya,
  • Yuji Imaizumi

DOI
https://doi.org/10.1254/jphs.sc0060213
Journal volume & issue
Vol. 103, no. 1
pp. 121 – 126

Abstract

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We examined the effects of methyl-β-cyclodextrin (MβCD) on Ca2+-induced Ca2+ release (CICR) in smooth muscle cells (SMCs) of mouse urinary bladder (UB). Short depolarization of UBSMCs under voltage-clamp elicited several local Ca2+ transients (Ca2+ hot spots) via CICR within 20 ms in discrete sub-sarcolemmal areas. Then, the Ca2+ wave spread to whole areas. The pretreatment with 10 mM MβCD significantly attenuated Ca2+ hot spots in UBSMCs and reduced contraction by single direct electrical pulse stimulation in UBSM strips. MβCD may prevent CICR by attenuating the coupling between voltage-dependent Ca2+ channels and ryanodine receptors in Ca2+ hot spot areas. Keywords:: methyl-β-cyclodextrin, Ca2+-induced Ca2+ release, smooth muscle