elvisheisler98

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When compared with the control (intact) males, both groups of treated males showed decreases in proapoptotic signaling, suggesting that testosterone is proapoptotic and is harmful to cardiomyocytes during ischemia and reperfusion.56 Researchers found that after ischemia and reperfusion, castrated male and flutamide‐treated male hearts showed decreased caspase‐1, caspase‐3, caspase‐11, TNF‐α, IL‐1β, IL‐6, and activated p38 MAPK in conjunction with increased Bcl‐2 expression. Western blot analysis revealed upregulation of caspase‐3 (apoptotic) and downregulation of Bcl‐2 (antiapoptotic) in the testosterone group compared with the controls.44 Estrada et al and Jia et al found similar effects of testosterone in the caspase‐3 and Bcl‐2 pathways, respectively, further suggesting a proapoptotic function of testosterone.54–55 Heart disease is the leading cause of death in both sexes.53 The concept of cardiomyocyte death signaling during ischemic heart disease and the role of testosterone merits investigation.
We have previously demonstrated that TRT in older, hypogonadal men confers changes to the protein composition of HDL without altering HDL-c concentrations or its cholesterol efflux capacity suggesting a neutral effect with regard to HDL-related cardiovascular risk. Importantly too, HDL-c concentrations in isolation may not be a reliable marker of CVD risk, since no long-term clinical data have established a link between the lower HDL-c concentrations caused specifically by TRT and increased incidence of CVD. The study endpoints include coronary artery plaque volume as measured by CT scan as well as serum lipids; thus, although resultant data merit interest, this study is underpowered to provide additional information regarding cardiovascular events. Recently, larger cross-sectional studies have been undertaken to better define the cardiovascular effects of TRT. Accordingly, clinical intervention studies have been performed to investigate whether TRT can mitigate CVD risk factors among men with low endogenous T concentrations; however, none of these have been powered to examine CVD event rates. The Rancho Bernardo study followed 1000 men aged 40–79 years over a 12-year period and found no association between plasma T levels and either extant CVD or subsequent cardiovascular morbidity and mortality .
Because of this controversy, we sought to determine the current status of basic science studies that have examined the effects of testosterone on the cardiovascular system in experimental models. This randomized controlled trial of elderly, frail men was halted early by the data safety monitoring board due to an excess of cardiovascular events noted among older men randomized to testosterone as compared with placebo. Although cross-sectional studies have demonstrated higher prevalence of CVD among men with low endogenous androgens, limited clinical data have not shown that testosterone replacement therapy (TRT) reduces CVD risk. We also take a closer look at effects of testosterone on lipids and HDL in particular, to see if this explains the cardiovascular effects seen in clinical studies. Since several recent studies have revealed that these nonaromatizable metabolites are fully capable of causing vascular relaxation (8, 10, 47, 48, 50, 73), the established concept that Tes is metabolized to inactive excretory metabolites must then be discarded when considering the effects of androgens on cardiovascular function. The well-established clinical observations that hypertension (HT) and coronary artery disease occur more frequently in men than in premenopausal women (26–28, 30, 31, 38, 69) have led to the dogmatic concept that testosterone (Tes) has deleterious effects on the heart and vasculature and exacerbates the development of CVD in males (18, 37, 54).
Gupta et al25 examined the differentiation and proliferation of human mesenchymal stem cells (hMSCs) and preadipocytes in vitro in the presence of DHT. Testosterone supplementation reduced visceral fat accumulation, improved fasting glucose levels, glucose tolerance, and mean arterial pressure, while having no statistically significant impact on total cholesterol or triglyceride levels. These experimental rabbits were compared with control rabbits given a standard diet. Jones et al22 extracted the coronary arteries and thoracic aortas from male rats and placed them in a physiological buffer. Endothelial denudation and l‐NAME treatment had no effect on this result.18 This finding is directly supported by a study done by Tep‐areenan et al19 in rat arteries.
However, there currently is no credible evidence that T therapy increases CV risk and substantial evidence that it does not. Testosterone replacement therapy (TRT) has been shown to improve myocardial ischemia in men with CAD, improve exercise capacity in patients with CHF, and improve serum glucose levels, HbA1c, and insulin resistance in men with diabetes and prediabetes. We review the evidence for a role of testosterone in vascular health, its therapeutic potential and safety in hypogonadal men with CVD, and some of the possible underlying mechanisms. Animal studies have consistently demonstrated that testosterone is atheroprotective, whereas testosterone deficiency promotes the early stages of atherogenesis.
Increasing your testosterone level might also increase your red blood cell count. Asides from the regulation of sex drive and body composition, testosterone increases the red blood cell production in the body. This is called cardiac hypertrophy, and it can affect the heart’s ability to pump blood effectively and might result in other cardiovascular complications. Though testosterone can increase strength and muscle mass, too much can cause an increase in the heart’s ventricle size. This deficiency increases the danger of cardiovascular disease and mortality. Testosterone deficiency is often linked with medical conditions like renal failure, cardiovascular diseases, malignancy, frailty, dyslipidemia, hypertension, metabolic syndrome, and diabetes. This study does not address testosterone’s safety in otherwise normal people who take it solely to build muscle or for other reasons—it just applies to patients with symptomatic hypogonadism and low testosterone levels.
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