These hormone interactions contribute to enhance physiological effects on protein and energy metabolism that mainly affect the liver rather than peripheral tissues (13, 15). AR knockout mice developed an increased liver lipogenesis and steatosis with upregulation of genes involved in fatty acid (FA) synthesis, and downregulation of genes involved in fat oxidation. The physiological role of AR in hepatic lipid metabolism has been shown in the context of hepatic AR knockout male mice (6). Taken together, this comprehensive analysis of gene expression and lipid profiling in hypothyroid male liver reveals a functional interplay between testosterone and pulsed GH administration. Biological network analysis of the effects of testosterone on GH-regulated transcriptome confirmed a close connection with crucial proteins involved in steroid and fatty acid metabolism. However, testosterone decreased the hepatic content of cholesterol esters and triacylglycerols and increased fatty acids whereas GH increased neutral lipids and decreased polar lipids. In addition, testosterone enhanced the effects of GH on the transcriptome linked to lipid biosynthesis, oxidation-reduction, and metabolism of unsaturated and long-chain fatty acids (FA). Other tests, such as liver imaging or more detailed blood work, may also be done. The doctor may repeat the test in a few weeks to see if the levels return to normal. Annual testing is common when the therapy is stable and no problems have shown up. If liver enzymes remain normal, testing may then happen once a year. This early check helps doctors see how the body is reacting to the testosterone. D–f Show the H&E staining of liver sections from eugonadal (EUG), hypogonadal (HYPO) and hypogonadal subjects treated with testosterone (HYPO + TTh), respectively. After insulin incubation, the cells were further incubated with 3H-2-deoxy-d-glucose 16 mM (1 mCi/mL) for 10 min. The assessment of the main morpho-functional features of human VAT preadipocytes, isolated from the three different treatment groups, was then performed, through analysis of glucose uptake, mitochondrial morphology and mRNA expression. Indeed, in adipocyte, dysfunctional mitochondria causes the spillover of lipids into non-adipose tissues, thus contributing to insulin resistance via lipotoxicity in other districts, including liver and vascular beds 7–10. Preadipocytes from TTh men also exhibited a healthier morpho-functional phenotype of mitochondria and higher insulin-sensitivity compared to untreated-hypogonadal ones. Serum testosterone is reduced in up to 90% of men with cirrhosis, with levels falling as liver disease advances. For those who are prescribed oral testosterone by a licensed healthcare provider, regular monitoring of liver enzymes is very important. This type of testosterone was linked to several serious liver problems. Understanding the history and current situation is important for anyone considering or currently using testosterone therapy. Among these, oral testosterone has raised the most concern when it comes to liver health. People who already have liver problems may need closer monitoring or a different type of treatment. Testosterone therapy can offer real health benefits, but it can also lead to liver changes that should not be ignored. It can be a normal reaction to starting testosterone therapy and may go back to normal over time. It may be caused by aging, injury to the testicles, or diseases that affect hormone levels. This condition means the body does not make enough testosterone on its own. The other is testosterone that comes from outside the body, called exogenous testosterone. When the body does not make enough testosterone, it can cause health problems. It is found in both men and women, but levels are much higher in men. Knowing the facts can make a big difference in treatment decisions and long-term health. The goal is to make sure the liver is working well and to catch any problems early. The ability of athletes to train day after day depends in large part on adequate restoration of muscle glycogen stores, a process that requires the consumption of sufficient dietary carbohydrates and ample time. Whilst the testosterone injections produce levels within the normal range, diurnal patterns are absent and supraphysiological levels in the first few days are apparent with near-infraphysiologic levels towards the end of the interval . Whether the AR-independent effects in this study are via conversion to estradiol and subsequent activation of the oestrogen receptor (ER) was not addressed. Mice with a targeted disruption of the Scd1 gene have very low levels of VLDL and impaired triglyceride and cholesterol ester biosynthesis, as well as markedly reduced adiposity and decreased hepatic steatosis on both lean and ob / ob background despite higher food intake 37, 38. GLUT4 expression is known to correlate positively with insulin responsiveness and defects in expression of GLUT4 have been observed in patients with T2D . Some of these effects are, at least in part, androgen receptor-independent and may potentially explain some of the observed clinical benefit of testosterone in men with T2D and MetS. In the past, oral testosterone—especially synthetic forms—was linked with serious liver damage. The connection between testosterone and liver enzymes is not always direct, but it is real and worth attention. These enzymes can rise for many reasons, and testosterone therapy is one of them. Hypothyroid-orchiectomized (TXOX) rat model was obtained and treated with GH (TXOXGH group) as described in Material and Methods. The table shows pathway name (KEGG), up- and down-regulated genes, P value, and corrected P value Benjamini (B). (A) Number of up- and downregulated genes in the TXOXGH, TXOXTP or TXOXTPGH groups. Hypothyroid-orchiectomized (TXOX) rat model was obtained and treated with vehicle (-TP; TXOX group) or TP (+TP; TXOXTP group) plus GH (TXOXTPGH and TXOXGH groups) as described in Material and Methods. Extensive similarity was also detected between BPs that were upregulated by pulsed GH (Figure 4) when compared with those regulated by GH in the presence of TP (i.e., TXOXTPGH) (Figure 5). First, we identified DEGs (Table S3) and KEGG signaling pathways (Table S4) induced by pulsed GH administration to TXOX rats. Table shows the pathway name (KEGG), up- and down-regulated genes, P value, and corrected P value Benjamini (B). Thus, males with either functional AR or normal circulating testosterone level would maintain normal level of fatty acid synthesis and avoid increased lipid deposition in the liver. Male but not female hepatic ArKO mice fed with a normal chow diet developed liver steatosis at 10 months with reduced fatty acid oxidation and increased de novo fatty acid synthesis . Replacement of testosterone reduces lipid deposition in the liver of Tfm mice to a similar level to control males . In contrast, GPER activation upregulates LDL receptor expression in the liver via downregulation of proprotein convertase subtilisin kexin type 9 to enhance LDL metabolism . In contrast, ER-α agonist PPT increases the expression of genes involved in lipid oxidation and metabolism .
