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A greater glycogen storage rate may be due to increased muscle glucose uptake and enhanced signaling pathways made possible by the influx of amino acids. Postexercise muscle glycogen concentrations were similar among treatments, but 24 hours later, less glycogen had been replenished with resistant starch compared with the other treatments. For that reason, waxy starches have been studied to assess how their ingestion influences glycogen metabolism and exercise performance.119–121 In 1996, Jozsi et al.121 published the results of a study in which 8 male participants completed 4 exercise trials in which they cycled for 60 minutes at 75% VO2max, followed by six 1-minutes sprints, a protocol that lowered muscle glycogen content. The authors attributed improved run performance to higher muscle (and possibly liver) glycogen levels prior to the final sprints. It is true that fructose better stimulates liver glycogen restoration and glucose does the same for muscle glycogen,104 but most physically active people normally ingest enough fructose and glucose in foods and beverages to restore liver glycogen. Immediately after physical activity, muscle cells that sustained a substantial decrease in glycogen content are metabolically prepared for rapid glycogenesis.. 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|Therefore, sex differences in liver metabolism, immunity and their interplay are important factors to consider when designing, studying and developing therapeutic strategies to treat human liver disease. Yes, switching from oral to injectable or transdermal testosterone can reduce liver stress and lower elevated liver enzyme levels. Yes, oral testosterone undergoes first-pass metabolism in the liver, which can stress the liver more than injectable or transdermal forms. It can improve insulin sensitivity, reduce fat in the belly area, and even lower some liver enzyme levels. Surprisingly, in some people with low testosterone and metabolic problems, testosterone therapy may actually help the liver. This liver condition is very common, especially in people with obesity or diabetes, and can be present even before testosterone therapy starts.|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.|In this review, we summarize current literature and discuss the role of estrogens and androgens and the mechanisms through which estrogen receptors and androgen receptors regulate lipid and glucose metabolism in the liver. In particular, these preadipocytes demonstrated a significantly improved insulin-stimulated glucose uptake, as compared to preadipocytes from untreated-hypogonadal obese subjects, reaching a level that was even higher than that of eugonadal ones. Essentially, a direct delivery of lipids from lipid droplets into mitochondria represents an efficient way to maintain ROS within physiological levels, thus shielding other cell organelles from lipotoxicity, while ensuring energy supply as well as insulin sensitivity 11, 61, 72, 73. A marked increase of genes related to lipid metabolism/handling (including PPARα, PRKACA, PRAKCB, SNAP23, STX5) and reactive oxygen species removal (such as PPARGC1β) were also observed in preadipocytes from T-treated hypogonadal patients. A significantly higher mRNA expression level of mitochondrial biogenesis (NRF1, TFAM), networking (MFN2, FIS1) and function (NDUFB3, NDFUB5, SDHB, FOXC2) markers was also observed in preadipocytes from TTh-hypogonadal patients as compared to untreated-hypogonadal ones. TTh significantly reduced serum cholesterol levels over time (pre-surgery vs. baseline visit), whilst a significant increase with time of triglycerides and transaminases along with a decrease in insulin serum levels (despite higher fasting glucose) was observed in untreated, but not in TTh-treated, hypogonadal subjects.|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.|We compared the influence of testosterone on the expression of regulatory targets of glucose, cholesterol and lipid metabolism in muscle, liver, abdominal subcutaneous and visceral adipose tissue. Association between AR mRNA and the expression of target genes related to lipid metabolism, lipid handling, glycogen synthesis, glucose transport and insulin-signaling in the liver Reduced expression of the nuclear receptor, liver X receptor (LXR), in muscle, liver and SAT of Tfm mice compared to testosterone-replete animals whether with or without AR function leads to the hypothesis that testosterone may increase LXR signalling to exert some of its protective metabolic effects. Additionally, in the present study we demonstrate that mRNA expression of Srebf1 and Srebf2, key transcription factors and master regulators of lipogenesis , were significantly decreased in SAT of Tfm mice compared to testosterone treated animals and wild-type controls.|Lin et al.13 showed that AR knockout in the liver of male C57BL6J mice resulted in hepatic steatosis, and loss of AR led to increased PEPCK level and hepatic insulin resistance. Lower fasting BGL and reduced increase in BGL upon pyruvate administration in the Treated group compared with the Control indicate reduced hepatic glucose output during long hours of fasting, and hence better glycemic control upon testosterone administration in T2DM male mice. To address this, we studied the effect of testosterone supplementation on insulin responsiveness and gluconeogenesis in the liver of high-fat diet-induced T2DM model in male C57BL6J mice as well as in HepG2 cell line. The negative effects of hypogonadism on somatotropic-liver axis were also evident in the present work performed in male hypothyroid rats, where the orchiectomy reduced body weight growth, circulating IGF-I or hepatic Igf-1 mRNA levels to greater extent than hypothyroidism without castration. E2 treatment induced expression of genes involved in FA oxidation (e.g., PPAR-dependent signaling) while T upregulated those genes linked to FA biosynthesis which agrees with an increased FFA accumulation in TXOXTP liver (Table 4). Compared to INTACTSO rats, TG levels were not affected in vehicle-treated TXOX but were considerably increased by GH (TXOXGH) and reached minimal levels after TP (TXOXTP) treatment (Table 3). System biology network analysis of GH effects on liver transcriptome in testosterone propionate (TP)-treated hypothyroid-orchiectomized rats.|In an experimental rabbit model of high fat diet-induced MetS, our group previously demonstrated that in vivo T dosing prevented visceral adipose tissue (VAT) expansion 18, 28 and counteracted its derangements, normalizing preadipocyte maturation, lipid handling and insulin sensitivity . On the other hand, existing evidence consistently shows that testosterone therapy (TTh) induces a beneficial effect on metabolic parameters. In obesity, excessive calorie intake finally often leads to an impaired insulin signaling, adipocyte hypertrophy, and lipid handling resistance 1–4. A potentially protective role for testosterone on the progression of NAFLD, improving hepatic steatosis and reducing intrahepatic triglyceride content, was also envisaged. The present data suggest that TTh in severely obese, hypogonadal individuals induces metabolically healthier preadipocytes, improving insulin sensitivity, mitochondrial functioning and lipid handling. In TTh-hypogonadal men, histopathological NAFLD activity and steatosis scores, as well as liver triglyceride content were lower than in untreated-hypogonadal men and comparable to eugonadal ones.}
Testosterone treatment to cells for 120 min, and insulin treatment 10 ng ml−1 and 250 ng ml−1 for 60 min, without removing testosterone; the data were analyzed by two-way repeated measures ANOVA test followed by Bonferroni post hoc analysis; data represent mean±s.d. We gave exogenous insulin treatment to the animals, and then checked for P-AKT (Ser-473) and FOXO1 levels in the liver of the two groups. In normal subjects, PEPCK level rises during fasting periods to attain normoglycemia, and in increased insulin resistance conditions also, its level increases resulting in increased hepatic glucose output. Thus, we investigated the effect of testosterone on gluconeogenesis pathway and insulin responsiveness in the liver. Instead, it could have altered signaling in the liver, which led to reduced hepatic glucose output in the testosterone-administered T2DM males.
The ER gene expression in female rat liver is under multihormonal regulation by glucocorticoids, T3, GH, and T. Energy demand can also be modulated by the regulation of lipogenesis that is often increased in situations of reduced energy expenditure, such as hypothyroidism and deficiency of GH-, E2- or T (2–4, 10). Despite this, it should be pointed that a functional cooperation between T and GH must be developed in order to enhance the physiological effects on protein anabolism. Paradoxically, we observed that in the presence of T, GH administration to TXOX rats downregulated ureagenesis genes whereas several ones involved in amino acid biosynthesis were still upregulated.
These signs mean the liver may not be working well and medical help is needed right away. Other times, the levels stay high and may signal a more serious problem. Sometimes, liver enzymes go up for a short time and return to normal.
We have also demonstrated in this study that the mRNA expression of Glucose-6-phosphate dehydrogenase (G6pd), the gateway enzyme in the pentose phosphate shunt pathway, is elevated in the liver of Tfm mice suggesting that glucose may also be utilised down this route during testosterone deficiency. Improved glucose utilisation in muscle, liver and SAT by testosterone may reduce the conversion of glucose to fat in times of excess and improve insulin sensitivity thus reducing lipid accumulation in these and other tissues. Protein expression of selected targets of lipid and glucose regulation in muscle and liver of Tfm mice. Gene expression of targets of lipid and glucose regulation in muscle, liver, subcutaneous and visceral adipose tissue of Tfm mice
Using testosterone without proper testing or using very high doses can harm the liver instead of helping it. Even though testosterone may improve liver health in some cases, it is not the right choice for everyone. Even small amounts of weight loss can greatly improve liver enzyme levels and lower the risk of liver disease. The liver then starts turning sugar into fat, which can build up in liver cells. Testosterone therapy may also help the body use insulin better.
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
The development of NAFLD leads to increased infiltration of non-conventional CXCR3+ TH17 cells, which can co-express IFNγ. In both NAFLD and NASH, patients exhibit increased circulating IFNγ-producing TH1 cells, and patients with NASH could be stratified from those with NAFLD by the increase in circulating TH17 cells . Furthermore, inhibition of the TNFα receptor, TNFR1, improves liver steatosis and insulin resistance . In the context of NAFLD, TNFα was shown to drive an increase in the expression of the genes Acaca (acetyl-CoA carboxylase alpha) and Scd1 (stearoyl-CoA desaturase 1) . Hepatic steatosis causes the release of DAMPs and CXCL10, leading to activation of the liver-resident macrophages (Kupffer cells). In its healthy state, the liver functions as an immune sentinel, sampling the blood that enters it via the hepatic portal vein, before it reaches the spleen or lymph nodes. Additionally, a larger study of postmenopausal women demonstrated that NAFLD was reduced in a group undergoing HRT therapy.

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