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The hPADs differentiation, 2 days after confluence (time 0), was induced by exposing cells to a differentiation mixture (DIM) containing 5 mg/mL insulin, 1 mM dexamethasone, and 0.5 mM 3-isobutyl-1-methylxanthine (IBMX) in 5% stripped FBS-supplemented DMEM for 8 days. The AMS is a self-reported scale developed to quantify health-related quality of life and symptoms of aging men and is useful in both the diagnosis of hypogonadism and the monitoring of patients using testosterone therapy . According to the recommendations of the International Society of Andrology (ISA), the ISSAM and the European Association of Urology (EAU) , hypogonadism was defined as levels of total testosterone (T) T 36. Numbers examined for eligibility, confirmed eligible, included in the study, completing follow-up, and analyzed are reported in the "Study design and treatment" subsection The outcomes reported in the present manuscript were changes over time between and within HYPO and HYPO + TTh groups in insulin sensitivity, adipogenic potential and mitochondrial function of preadipocytes (hPADs) isolated from adipose tissue biopsies and in the severity of NAFLD evaluated by triglycerides assay and liver biopsies histology|ANOVA, analysis of variance; C, Control; C+I, Control animal with insulin treatment; HFD, high-fat diet; PTT, pyruvate tolerance test; T, Treated; T+I, Treated animal with insulin treatment. (g) Immunoblot and densitometry for PEPCK levels in the liver of Control and Treated animals. Serum levels of analytes involved in glucose homeostasis in Control and Treated animals. In Treated group, 18 weeks age onwards till the end of the experiment, 8 mg kg−1 body weight testosterone propionate (from Sigma Aldrich, St Louis, MO, USA) suspended in sesame oil was subcutaneously injected twice a week and the Control group was treated with vehicle sesame oil (Figure 1a). These findings support the hypothesis that liver-targeted T therapy may open up a new approach to achieve whole-body anabolism both alone and in combination with pulsed GH administration. Accordingly, our differential gene expression analysis showed that GH increased the mRNA level of choline kinase-α (Ckα), the first enzyme in the Kennedy pathway and responsible for de novo synthesis of phosphatidylcholine (91), an effect which was abolished in the presence of T.|Some may see clear improvements in liver enzymes, while others may not. More movement means better metabolism and better use of blood sugar. After therapy, energy often improves, and people may become more active.|To allow for sufficient muscle glycogen restoration between training sessions and overnight, athletes should consume enough carbohydrates to replace all or at least a substantial amount of the glucose oxidized during the day. Consumption of a variety of carbohydrate foods ensures adequate muscle and liver glycogen restoration between bouts of physical activity. To maintain muscle glycogen stores, athletes are advised to consume a high-carbohydrate diet that contains adequate energy (calories), along with proteins to stimulate muscle repair and growth and fluids to ensure normal hydration. Males and females appear to restore muscle glycogen at similar rates following exercise, as long as sufficient carbohydrates and energy are consumed.98 In older adults, regular exercise training increases the GLUT4 and glycogen content of skeletal muscle, responses similar to those seen in younger adults; however, resting muscle glycogen does not seem to increase to levels seen in younger adults.138,139 Consuming proteins with carbohydrates may be beneficial in stimulating rapid glycogenesis in the hours immediately following exercise,65 a finding that has implications for speeding recovery between demanding bouts of exercise within the same day.|These data indicate a strong remodeling effect of hormonal treatments on hepatic phospholipids. Furthermore, the combination of GH and TP significantly increased total neutral lipids due to changes in hepatic contents of CHO, cholesteryl esters, TG and DG. Cholesteryl esters were highly increased by GH treatment and reached lowest levels after TP (that together exhibited a certain degree of antagonism). The highest levels of hepatic CHO were found in TXOX rats whereas the lowest values were observed in TXOXGH rats Table 3 and (33).|In the liver, testosterone treatment resulted in an increased mRNA expression of several genes involved in hepatic lipid and glucose/glycogen metabolism (Fig. 5 panel a). In the present exploratory study, we aim to investigate whether the metabolic protective effects of testosterone act via modulation of the expression of key targets involved in lipid and glucose metabolism in muscle, liver and adipose tissue of cholesterol-fed Tfm mice. Increased liver fat in Tfm mice from the present study is considered partly due to increased de novo lipogenesis and the expression of FASN and ACACA , which supported earlier studies indicating that a lack of testosterone action results in hepatic lipid accumulation 41–43. A Displays the liver tissue relative mRNA expression of smooth muscle/fibrosis markers and genes related to glucose transport, insulin signaling, glycogenesis and lipid handling and metabolism. Exploratory evidence from this study suggests that testosterone has tissue-specific metabolic effects in the regulation of gene targets which control glucose utilisation in liver, SAT and skeletal muscle, and lipid metabolism in liver and SAT. Western blotting showed hepatic protein expression of FASN and ACACA to be increased in Tfm mice confirming gene expression findings.2 Testosterone treatment significantly reduced the protein expression of these enzymes versus placebo treated Tfm mice to similar levels as XY littermates.|Overall, our findings demonstrate the complex interactions between T and GH to achieve hepatic FA composition. PPARα is a pivotal transcriptional regulator of genes involved in FA β/ω-oxidation (83). Whether this mechanism contributes to regulate the effects of T- or GH-regulated LCPUFA synthesis and PPAR-dependent transcription still deserves extensive research. In this case, the crosstalk between T and GH was evident because DHA levels were higher when GH was administered alone. Noteworthy, in the present work we demonstrated that T abolished the positive effects of GH on the biosynthesis of essential LCPUFA (i.e., T alone or combined with GH failed to modify EPA and DHA contents). In contrast, MUFAs might negatively regulate Scd1 gene expression by blocking SREBP1c cleavage (76).|But not all high liver enzyme levels mean there is something wrong. If liver enzymes stay high or go much higher than normal, the doctor may stop or lower the dose of testosterone. Sometimes exercise, muscle injury, or other medications can raise liver enzymes for a short time. If liver enzyme levels go above the normal range, the doctor will try to find out why. If the liver enzymes are still in a safe range, the therapy can usually continue. Before someone begins testosterone therapy, a doctor will usually order a baseline blood test. While testosterone does not always cause liver damage, it can sometimes affect liver enzymes.|Some herbal products and bodybuilding supplements have been linked to drug-induced liver injury (DILI). These unlisted substances may include anabolic steroids or prohormones, which can be harmful to the liver. This can make it hard for doctors to know the real reason for abnormal liver tests. Still, regular monitoring and a full view of a person’s health are needed to make sure therapy is safe and effective. It can reduce belly fat, improve insulin sensitivity, and support weight loss.}
Total glycogen repletion with glucose was greater than that with waxy starch was greater than that with maltodextrin was greater than that with resistant starch. Waxy starches from varietals of potatoes, corn (maize), and barley are high in amylopectin and low in amylose; amylopectin is less resistant to digestion because its glucose chains are more highly branched compared with amylose. Consuming high-GI foods is important on occasions when rapid resynthesis of muscle glycogen is critical, as is the case during 2-a-day training and competitions requiring multiple games/matches during a single day. Increasing the carbohydrate content of the diet to 10.5 g/kg BW/day (vs 6.2 g/kg BW/day) resulted in 47% greater pre-exercise muscle glycogen stores, better cycling performance, and enhanced reliance on muscle glycogen as fuel.
Five μg of high-quality total RNA from the liver were reverse-transcribed and labelled with cyanine 3 (Cy3) and -5 (Cy5) using the ChipShot™ Direct Labeling System (Promega). All samples were treated with RNAse-free DNAse set (Promega, Madison, WI, USA) and RNA was further purified by using the RNeasy Micro Kit (Qiagen, Valencia, CA, USA) following manufacturer’s recommendations. Total and neutral lipid fractions were subjected to acid-catalyzed transmethylation for 16 h at 50°C using 1 ml of toluene and 2 ml of 1% sulfuric acid (v/v) in methanol.
Interestingly, in this study we observed that GH alone restored total SFAs in TXOX rats to the same levels of INTACTSO animals, a situation where SFAs levels dropped and MUFA levels increased. Hypothyroidism in non-castrated male rats highly increased the hepatic level of total SFAs compared to euthyroid INTACTSO rats (33). Fourth, in this study, T replacement in TXOX rats was not able to increase the transcription of hepatic genes linked to hepatic FA uptake, transport, activation or CHO removal nor PPARα target genes which, however, were positively regulated by E2 (33, 64). However, our data demonstrated that neither T nor GH, nor their combinatory treatment increased the levels of ERα mRNA in TXOX rats at the end-time point. Furthermore, T can functionally cooperate with GH to enhance its physiological effects on protein and energy metabolism, an effect that is developed mainly in the liver rather than in peripheral tissues (13, 15).
Consuming a diet that supplies ample carbohydrates and energy (calories) to match or exceed daily expenditures results in a gradual supercompensation of muscle glycogen stores over days and weeks, a response that can be further enhanced by dietary interventions (see Table 2).33,54–68 Improved physical fitness is an additional stimulus for enhanced muscle glycogen stores, helping ensure that ample carbohydrate energy is available to fuel intense and prolonged training and competition. Much of our understanding of how muscle glycogen stores decline during physical activity and are restored during subsequent rest comes from studies that used the muscle biopsy technique. Intramyofibrillar glycogen is used by the sarcoplasmic reticulum to allow for calcium release and muscle contraction, so its depletion likely contributes to fatigue.51,52 Glycogen from all 3 cellular "compartments" is used during exercise, but it appears that the intramyofibrillar glycogen use is greater in both type I (slow-twitch) and type II (fast-twitch) fibers.50 Nielsen et al.51 used transmission electron microscopy to show that intramyofibrillar glycogen was preferentially oxidized in both types I and II muscle fibers during exhaustive cross-country ski racing. Depiction of glycogen, a large spherical particle formed by linking glucose molecules into strands and branches. As shown in Figure 1, glycogen synthase creates α-1,4-glycosidic linkages to create a strand of glucose molecules, and the branching enzyme establishes α-1,6 bonds between glucose molecules to create branches every 8–12 glucose molecules; the branches increase the density, solubility, and surface area of the glycogen particle.13,42
Thus this study demonstrated the importance of the maintenance of estrogen oscillation to limit fat deposition in the hepatic tissues in females . Specifically, estrogens regulate the activity and expression of lipogenic genes to directly inhibit lipogenesis in several animal species 37, 38. Action of estrogens and androgens via estrogen receptors (ERs) and androgen receptors (ARs) in the liver cells. We will discuss how hepatic estrogen signaling via ERs regulates metabolism in male and female animal and human models. The effects of estrogens on male and female reproductive organs have been extensively studied, but the beneficial effects of estrogens in nonclassical endocrine targets including the liver are less appreciated.