Transient receptor potential C4/5 like channel is involved in stretch-induced spontaneous uterine contraction of pregnant rat

Seungsoo Chung, Young Hwan Kim, Ji Hyun Joeng, Duck Sun Ahn

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Spontaneous myometrial contraction (SMC) in pregnant uterus is greatly related with gestational age and growing in frequency and amplitude toward the end of gestation to initiate labor. But, an accurate mechanism has not been elucidated. In human and rat uterus, all TRPCs except TRPC2 are expressed in pregnant myometrium and among them, TRPC4 are predominant throughout gestation, suggesting a possible role in regulation of SMC. Therefore, we investigated whether the TRP channel may be involved SMC evoked by mechanical stretch in pregnant myometrial strips of rat using isometric tension measurement and patch-clamp technique. In the present results, hypoosmotic cell swelling activated a potent outward rectifying current in G protein-dependent manner in rat pregnant myocyte. The current was significantly potentiated by 1 μ M lanthanides (a potent TRPC4/5 stimulator) and suppressed by 10 μ M 2-APB (TRPC4-7 inhibitor). In addition, in isometric tension experiment, SMC which was evoked by passive stretch was greatly potentiated by lanthanide (1μ M) and suppressed by 2-APB (10 μ M), suggesting a possible involvement of TRPC4/5 channel in regulation of SMC in pregnant myometrium. These results provide a possible cellular mechanism for regulation of SMC during pregnancy and provide basic information for developing a new agent for treatment of premature labor.

Original languageEnglish
Pages (from-to)503-508
Number of pages6
JournalKorean Journal of Physiology and Pharmacology
Volume18
Issue number6
DOIs
StatePublished - Dec 1 2014
Externally publishedYes

Keywords

  • Osmotic stress
  • Spontaneous uterine contraction
  • Stretch
  • Transient receptor potential C4/5

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