OBJECTIVES: The objective of this study was to examine gender differences in left ventricular (LV) function and expression of cardiac genes in response to LV pressure overload due to ascending aortic stenosis in rats. BACKGROUND: Clinical studies have documented gender differences in the pattern of adaptive LV hypertrophy. Whether these differences result from intrinsic differences in molecular adaptation to pressure overload between men and women, or are related to other factors is not known. METHODS: Male (n = 8) and female (n = 8) Wistar rats underwent ascending aortic stenosis and were studied 6 weeks after banding with gender-matched control rats (male n = 7; female n = 7). The LV contractile reserve was examined in isolated hearts from each group. We compared LV messenger ribonucleic acid (mRNA) levels of atrial natriuretic factor (ANF), beta-myosin heavy chain, sarcoplasmic reticulum Ca2+-adenosine triphosphatase (ATPase) and Na+-Ca2+ exchanger. Reverse transcriptase polymerase chain reaction was used to identify estrogen receptor transcript in cardiac myocytes and LV tissue. RESULTS: The magnitude of LV hypertrophy (LVH) and systolic wall stress were similar in male and female animals with LVH. Male LVH hearts demonstrated a depressed contractile reserve; in contrast, contractile reserve was preserved in female LVH hearts. The expression of beta-myosin heavy chain and ANF mRNA was greater in male versus female LVH hearts. Sarcoplasmic reticulum Ca2+-ATPase mRNA levels were depressed in male LVH but not in female LVH compared with control rats, and Na+-Ca2+ exchanger mRNA levels were increased similarly in both male and female LVH hearts. Estrogen receptor transcript was detected in both adult male and female cardiac myocytes and LV tissue. CONCLUSIONS: There are significant gender differences in the LV adaptation to pressure overload despite a similar degree of LVH and systolic wall stress in male and female rats. There is the potential for estrogen signaling through the adult myocyte estrogen receptor in both male and female rats to contribute to gender differences in gene expression in pathologic hypertrophy.
OBJECTIVES: The objective of this study was to examine gender differences in left ventricular (LV) function and expression of cardiac genes in response to LV pressure overload due to ascending aortic stenosis in rats. BACKGROUND: Clinical studies have documented gender differences in the pattern of adaptive LV hypertrophy. Whether these differences result from intrinsic differences in molecular adaptation to pressure overload between men and women, or are related to other factors is not known. METHODS: Male (n = 8) and female (n = 8) Wistar rats underwent ascending aortic stenosis and were studied 6 weeks after banding with gender-matched control rats (male n = 7; female n = 7). The LV contractile reserve was examined in isolated hearts from each group. We compared LV messenger ribonucleic acid (mRNA) levels of atrial natriuretic factor (ANF), beta-myosin heavy chain, sarcoplasmic reticulum Ca2+-adenosine triphosphatase (ATPase) and Na+-Ca2+ exchanger. Reverse transcriptase polymerase chain reaction was used to identify estrogen receptor transcript in cardiac myocytes and LV tissue. RESULTS: The magnitude of LV hypertrophy (LVH) and systolic wall stress were similar in male and female animals with LVH. Male LVH hearts demonstrated a depressed contractile reserve; in contrast, contractile reserve was preserved in female LVH hearts. The expression of beta-myosin heavy chain and ANF mRNA was greater in male versus female LVH hearts. Sarcoplasmic reticulum Ca2+-ATPase mRNA levels were depressed in male LVH but not in female LVH compared with control rats, and Na+-Ca2+ exchanger mRNA levels were increased similarly in both male and female LVH hearts. Estrogen receptor transcript was detected in both adult male and female cardiac myocytes and LV tissue. CONCLUSIONS: There are significant gender differences in the LV adaptation to pressure overload despite a similar degree of LVH and systolic wall stress in male and female rats. There is the potential for estrogen signaling through the adult myocyte estrogen receptor in both male and female rats to contribute to gender differences in gene expression in pathologic hypertrophy.
Authors: Maria Sanz-de la Garza; Geneviève Giraldeau; Josefa Marin; Gonzalo Grazioli; Montserrat Esteve; Luigi Gabrielli; Carlos Brambila; Laura Sanchis; Bart Bijnens; Marta Sitges Journal: Eur J Appl Physiol Date: 2017-02-01 Impact factor: 3.078
Authors: P Krzesiński; A Stańczyk; G Gielerak; B Uziębło-Życzkowska; M Kurpaska; K Piotrowicz; A Skrobowski Journal: J Hum Hypertens Date: 2015-01-29 Impact factor: 3.012
Authors: Zhuo Zhao; Hao Wang; Jewell A Jessup; Sarah H Lindsey; Mark C Chappell; Leanne Groban Journal: Am J Physiol Heart Circ Physiol Date: 2014-01-10 Impact factor: 4.733
Authors: Bernhard M Kaess; Philimon Gona; Martin G Larson; Susan Cheng; Jayashree Aragam; Satish Kenchaiah; Emelia J Benjamin; Ramachandran S Vasan Journal: Heart Date: 2013-09-16 Impact factor: 5.994
Authors: Shuchita Gupta; Beatriz Cepeda-Valery; Abel Romero-Corral; Abu Shamsuzzaman; Virend K Somers; Gregg S Pressman Journal: J Clin Sleep Med Date: 2012-12-15 Impact factor: 4.062
Authors: Karen Sliwa; Dike Ojji; Katrin Bachelier; Michael Böhm; Albertino Damasceno; Simon Stewart Journal: Clin Res Cardiol Date: 2014-01-28 Impact factor: 5.460