Prenatal nicotine exposure induces gender-associated left ventricular-arterial uncoupling in adult offspring

Wang,Zhenhua; Ouyang,Qiufang; Huang,Ziyang; Lin,Ling; Yu,Er'mei; Ferrari,Markus  W.

doi:10.3892/mmr.2015.3364

Prenatal nicotine exposure induces gender-associated left ventricular-arterial uncoupling in adult offspring

Authors:
- Zhenhua Wang
- Qiufang Ouyang
- Ziyang Huang
- Ling Lin
- Er'mei Yu
- Markus W. Ferrari
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Affiliations: Cardiovascular Department, Second Affiliated Hospital and Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000, P.R. China, Rheumatism Department, Second Affiliated Hospital and Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000, P.R. China, Clinic of Internal Medicine 1, HSK, Clinic of the City of Wiesbaden and the HELIOS Group, Wiesbaden D‑65199, Germany
Published online on: February 17, 2015 https://doi.org/10.3892/mmr.2015.3364
Pages: 410-418

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Abstract

Alterations in vascular or myocardial structure and function have been demonstrated in offspring subjected to prenatal nicotine exposure (PNE), however, limited data are available on how these changes interact. The present study assessed the hypothesis that prenatal nicotine exposure induced gender‑specific alterations of left ventricular‑arterial coupling indices in adult offspring. Female Sprague‑Dawley rats were exposed to either nicotine (8 mg/kg/day) or saline via subcutaneous osmotic mini‑pumps throughout gestation. Male and female offspring, aged 12 months, underwent non‑invasive echocardiography and invasive left ventricular cannulation. Left ventricular‑arterial coupling was analysed as the ratio of effective arterial elastance (Ea) to ventricular end‑systolic elastance (Ees). The left ventricular myocardium and aorta were stained with hematoxylin and eosin and the myocardial cell cross‑sectional area was calculated. Simultaneously, the ratio of medium thickness to internal diameter in the aorta and mesenteric artery was determined. The fibrosis component of left ventricle myocardium was analyzed by Sirius‑red staining and further confirmed by hydroxyproline determination. The elastic properties of the aortic wall were analyzed by van Gieson staining. PNE caused significant increases in pulse pressure (56.36±7.41 vs. 50.16±4.94 mmHg; P<0.05) and left ventricular meridional wall stress (78.25±9.12 vs. 69.64±7.58 kdyne/cm2; P<0.05) in male offspring compared with the control. Conversely, no similar effect was observed in female offspring. An elevated augmentation index was noted in male and female pups. Additionally, Ea/Ees was reduced in PNE males compared with control males, due to a disproportionate increase in Ees vs. Ea whereas in females, Ea/Ees did not differ significantly due to tandem increase in Ea and Ees. In addition, collagen cross‑linking was markedly higher in male offspring, whereas it was unaltered in females compared with their respective controls. Fragmentation of the elastic network in the aorta and the increased ratio of medial thickness to internal diameter in the mesenteric artery were more evident in male offspring when compared with female offspring. PNE caused combined ventricular‑arterial stiffening in male and female offspring, with lower Ea/Ees in males, while Ea/Ees was preserved in females. Enhanced collagen cross‑linking in the myocardium, underdeveloped elastic fibers in the aorta and remodeled resistance vessels were associated with pathological ventricular arterial mismatching. The results of the present study indicated that male offspring were more susceptible to the development of ventricular and arterial dysfunction in response to PNE compared with female offspring.

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