Department of Medicine, Division of Cardiology, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA.
Leonard M. Miller School of Medicine, Interdisciplinary Stem Cell Institute, University of Miami, Miami, FL 33136, USA.
Int J Mol Sci. 2022 Jun 15;23(12):6674. doi: 10.3390/ijms23126674.
Alport syndrome (AS) is a hereditary renal disorder with no etiological therapy. In the preclinical model of AS, disease progression and severity vary depending on mouse strain. The sodium-glucose cotransporter 2 (SGLT2) is emerging as an attractive therapeutic target in cardiac/renal pathologies, but its application to AS remains untested. This study investigates cardiorespiratory function and SGLT2 renal expression in mice from three different genetic backgrounds, 129x1/SvJ, C57Bl/6 and Balb/C. male 129x1/SvJ mice displayed alterations consistent with heart failure with preserved ejection fraction (HFpEF). Female, but not male, C57Bl/6 and Balb/C mice exhibited mild changes in systolic and diastolic function of the heart by echocardiography. Male C57Bl/6 mice presented systolic dysfunction by invasive hemodynamic analysis. All strains except Balb/C males demonstrated alterations in respiratory function. SGLT2 expression was significantly increased in AS compared to WT mice from all strains. However, cardiorespiratory abnormalities and SGLT2 over-expression were significantly less in AS Balb/C mice compared to the other two strains. Systolic blood pressure was significantly elevated only in mutant 129x1/SvJ mice. The results provide further evidence for strain-dependent cardiorespiratory and hypertensive phenotype variations in mouse AS models, corroborated by renal SGLT2 expression, and support ongoing initiatives to develop SGLT2 inhibitors for the treatment of AS.
Alport 综合征(AS)是一种遗传性肾脏疾病,目前尚无病因治疗方法。在 AS 的临床前模型中,疾病的进展和严重程度因小鼠品系而异。钠-葡萄糖共转运蛋白 2(SGLT2)在心脏/肾脏病理中作为一种有吸引力的治疗靶点而备受关注,但在 AS 中的应用尚未得到验证。本研究调查了来自三种不同遗传背景(129x1/SvJ、C57Bl/6 和 Balb/C)的雄性和雌性小鼠的心肺功能和 SGLT2 肾脏表达。129x1/SvJ 雄性小鼠表现出与射血分数保留型心力衰竭(HFpEF)一致的改变。雌性但不是雄性 C57Bl/6 和 Balb/C 小鼠通过超声心动图显示出心脏收缩和舒张功能的轻度改变。雄性 C57Bl/6 小鼠通过有创血流动力学分析显示出收缩功能障碍。除了 Balb/C 雄性小鼠外,所有品系的呼吸功能都发生了改变。与所有品系的 WT 小鼠相比,AS 小鼠的 SGLT2 表达显著增加。然而,与其他两种品系相比,AS Balb/C 小鼠的心肺异常和 SGLT2 过度表达明显减少。只有突变型 129x1/SvJ 小鼠的收缩压显著升高。这些结果为 AS 小鼠模型中依赖于品系的心肺和高血压表型变异提供了进一步的证据,这与肾脏 SGLT2 表达相符,并支持了开发 SGLT2 抑制剂治疗 AS 的持续努力。