The Role of Serotonin in Ventricular Repolarization in Pregnant Mice

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Purpose: The mechanisms underlying repolarization abnormalities during pregnancy are not fully understood. Although maternal serotonin (5-hydroxytryptamine, 5-HT) production is an important determinant for normal fetal development in mice, its role in mothers remains unclear. We evaluated the role of serotonin in ventricular repolarization in mice hearts via 5Htr3 receptor (Htr3a) and investigated the mechanism of QT-prolongation during pregnancy. Materials and Methods: We measured current amplitudes and the expression levels of voltage-gated K+ (Kv) channels in freshly-isolated left ventricular myocytes from wild-type non-pregnant (WT-NP), late-pregnant (WT-LP), and non-pregnant Htr3a homozygous knockout mice (Htr3a(-/-)-NP). Results: During pregnancy, serotonin and tryptophan hydroxylase 1, a rate-limiting enzyme for the synthesis of serotonin, were markedly increased in hearts and serum. Serotonin increased Kv current densities concomitant with the shortening of the QT interval in WT-NP mice, but not in WT-LP and Htr3a(-/-)-NP mice. Ondansetron, an Htr3 antagonist, decreased Kv currents in WT-LP mice, but not in WT-NP mice. Kv4.3 directly interacted with Htr3a, and this binding was facilitated by serotonin. Serotonin increased the trafficking of Kv4.3 channels to the cellular membrane in WT-NP. Conclusion: Serotonin increases repolarizing currents by augmenting Kv currents. Elevated serotonin levels during pregnancy counterbalance pregnancy-related QT prolongation by facilitating Htr3-mediated Kv currents.
Publisher
YONSEI UNIV COLL MEDICINE
Issue Date
2018-03
Language
English
Article Type
Article
Keywords

SUDDEN CARDIAC DEATH; LONG QT SYNDROME; HERG; SEX; MORPHOGENESIS; TRAFFICKING; HYPERTROPHY; RECEPTOR; HORMONES; HEART

Citation

YONSEI MEDICAL JOURNAL, v.59, no.2, pp.279 - 286

ISSN
0513-5796
DOI
10.3349/ymj.2018.59.2.279
URI
http://hdl.handle.net/10203/240595
Appears in Collection
MSE-Journal Papers(저널논문)
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