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Effects of the Histamine H1 Antagonist Chlorcyclizine on Rat Fetal Palate Development

Effects of the Histamine H1 Antagonist Chlorcyclizine on Rat Fetal Palate Development

Brian P Enright, Yi-Zhong Gu, Ronald D Snyder, Ravi R Dugyala, Leslie A Obert, Kimberley A Treinen, Barry S McIntyre, Robert W Veneziale

Birth Defects Res B Dev Reprod Toxicol. 2010 Dec;89(6):474-84.

PMID: 21058326

Abstract:

Background:
The effects of histamine H1 antagonist chlorcyclizine on rat palate development were characterized following in utero exposure.
Methods:
To identify the optimum dose for inducing cleft palate, pregnant rats were administered 30, 60, or 90 mg/kg chlorcyclizine on Gestation Days 11 to 14. Fetal palate gene expression was also assessed after 90 mg/kg chlorcyclizine at 8, 15 and 30 hours post-dose on Gestation Day 14 using microarray and qRT-PCR.
Results:
Rats in the 60- and 90-mg/kg groups exhibited adverse clinical signs and body weight loss. Rats in the 90-mg/kg group also demonstrated increases in late resorptions and decreases in fetal weight. Effects in the low-dose group were limited to decreases in body weight gain. Fetal assessment on Gestation Day 21 revealed that findings were limited to the 60- and 90-mg/kg groups, and included cleft palate (80% of litters for both groups), high arched palate, small nose, micrognathia, high domed head, digits shortened/absent and small limb. The fetal incidence of cleft palate was higher at 90 mg/kg, thus this dose was selected to assess palate gene expression. The altered genes associated with chlorcyclizine-induced cleft palate included Wnt5a, Bmp2, Bmp4, Fgf10, Fgfr2, Msx1, and Insig1 but the magnitude of the change was relatively small (1.5- to 2-fold).
Conclusions:
Expression of several genes involved in palate, limb and digit development was altered in the fetal palate following in utero exposure to chlorcyclizine. The subtle perturbation and interplay of these genes may have profound effects on the dynamics of fetal palate development.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP82939	Chlorcyclizine		82-93-9	Price

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