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神经嵴特异性缺失导致面中部发育不全、鼻气道阻塞以及呼吸模式紊乱,模拟阻塞性睡眠呼吸暂停。

Neural crest-specific deletion of leads to midfacial hypoplasia, nasal airway obstruction, and disordered breathing modelling Obstructive Sleep Apnea.

作者信息

Baddam Pranidhi, Biancardi Vivian, Roth Daniela M, Eaton Farah, Thereza-Bussolaro Claudine, Mandal Rupasri, Wishart David S, Barr Amy, MacLean Joanna, Flores-Mir Carlos, Pagliardini Silvia, Graf Daniel

机构信息

School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.

Department of Physiology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.

出版信息

Dis Model Mech. 2021 Jan 11;14(2). doi: 10.1242/dmm.047738.

Abstract

Pediatric obstructive sleep apnea (OSA), a relatively common sleep-related breathing disorder (SRBD) affecting approximately 1-5% of children, is often caused by anatomical obstruction and/or collapse of the nasal and/or pharyngeal airways. The resulting sleep disruption and intermittent hypoxia lead to various systemic morbidities. Predicting the development of OSA from craniofacial features alone is currently not possible and a controversy remains if upper airway obstruction facilitates reduced midfacial growth or vice-versa. Currently, there is no rodent model that recapitulates both the development of craniofacial abnormalities and upper airway obstruction to address these questions. Here, we describe that mice with a neural crest-specific deletion of (Bmp7) present with shorter, more acute angled cranial base, midfacial hypoplasia, nasal septum deviation, turbinate swelling and branching defects, and nasal airway obstruction. Interestingly, several of these craniofacial features develop after birth during periods of rapid midfacial growth and precede the development of an upper airway obstruction. We identified that in this rodent model, no single feature appeared to predict upper airway obstruction, but the sum of those features resulted in a reduced breathing frequency, apneas and overall reduced oxygen consumption. Metabolomics analysis of serum from peripheral blood identified increased levels of hydroxyproline, a metabolite upregulated under hypoxic conditions. As this model recapitulates many features observed in OSA, it offers unique opportunities for studying how upper airway obstruction affects breathing physiology and leads to systemic morbidities.

摘要

小儿阻塞性睡眠呼吸暂停(OSA)是一种相对常见的与睡眠相关的呼吸障碍(SRBD),影响约1%-5%的儿童,通常由鼻腔和/或咽气道的解剖性阻塞和/或塌陷引起。由此导致的睡眠中断和间歇性缺氧会引发各种全身性疾病。目前仅根据颅面特征无法预测OSA的发展,而上气道阻塞是否会促进面中部生长减少,反之亦然,仍存在争议。目前,尚无啮齿动物模型能够同时再现颅面异常的发展和上气道阻塞情况来解决这些问题。在此,我们描述了一种神经嵴特异性缺失(Bmp7)的小鼠,其颅底较短、角度更尖锐,面中部发育不全,鼻中隔偏曲,鼻甲肿胀和分支缺陷,以及鼻气道阻塞。有趣的是,这些颅面特征中有几种是在出生后面中部快速生长期间出现的,且先于上气道阻塞的发展。我们发现,在这个啮齿动物模型中,没有单一特征似乎能预测上气道阻塞,但这些特征的总和会导致呼吸频率降低、呼吸暂停以及总体耗氧量减少。对外周血血清的代谢组学分析发现,羟脯氨酸水平升高,羟脯氨酸是一种在缺氧条件下上调的代谢物。由于该模型再现了OSA中观察到的许多特征,它为研究上气道阻塞如何影响呼吸生理并导致全身性疾病提供了独特的机会。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6397/7888714/043f176fdd44/dmm-14-047738-g1.jpg

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