Effects of d- and l-limonene on the pregnant rat myometrium in vitro.

Abstract:

AIM:To study the effects of d- and l-limonene on pregnant rat myometrial contractility in vitro, and investigate how these effects are modified by other agents. D- and l-limonene (10(-13)-10(-8) M) caused myometrial contraction in a dose-dependent manner. METHODS:Contractions of uterine rings from 22-day-pregnant rats were measured in an organ bath in the presence of d- or l-limonene (10(-13)-10(-8) M) and nifedipine (10(-8) M), tetraethyl-ammonium (10(-3) M), theophylline (10(-5) M), or paxilline (10(-5) M). Uterine cyclic adenosine monophosphate (cAMP) level was detected by enzyme immunoassay. Oxidative damage was induced by methylglyoxal (3×10(-2) M) and the alteration was measured via noradrenaline (1×10(-9) to 3×10(-5) M) -induced contractions. RESULTS:Pre-treatment with nifedipine (10(-8) M), tetraethylammonium (10(-3) M), and theophylline (10(-5) M) attenuated the contracting effect of d- and l-limonene, while in the presence of paxilline (10(-5) M) d- and l-limonene were ineffective. The two enantiomers decreased the myometrial cAMP level, but after paxilline pretreatment the cAMP level was not altered compared with the control value. Additionally, l-limonene (10(-6) M) diminished consequences of oxidative damage caused by methylglyoxal (3×10(-2) M) on contractility, whereas d-limonene was ineffective. CONCLUSION:Our findings suggest that l-limonene has an antioxidant effect and that both d-and l-limonene cause myometrial contraction through activation of the A2A receptor and opening of the voltage-gated Ca(2+) channel. It is possible that limonene-containing products increase the pregnant uterus contractility and their use should be avoided during pregnancy.

journal_name

Croat Med J

journal_title

Croatian medical journal

authors

Hajagos-Tóth J,Hódi Á,Seres AB,Gáspár R

doi

10.3325/cmj.2015.56.431

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

431-8

issue

5

eissn

0353-9504

issn

1332-8166

journal_volume

56

pub_type

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