Glycogen repletion following continuous and intermittent exercise to exhaustion

1980 ◽  
Vol 49 (4) ◽  
pp. 722-728 ◽  
Author(s):  
G. A. Gaesser ◽  
G. A. Brooks
Keyword(s):  
Skeletal Muscle ◽  
Blood Glucose ◽  
Intermittent Exercise ◽  
Lactate Concentration ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Complete Restoration ◽  
Female Wistar Rats ◽  
Endogenous Substrates ◽  
Glycogen Repletion

Patterns of postexercise glycogen repletion in heart, skeletal muscle, and liver in the absence of exogenously supplied substrates during the first 4 h of recovery were assessed. Female Wistar rats were run to exhaustion using continuous (1.0 mph, 15% grade) and intermittent (alternate 1-min intervals at 0.5 and 1.5 mph, 15% grade) exercise protocols. Rats at exhaustion were characterized by marked depletion of glycogen in heart (55%), skeletal muscle (94%), and liver (97%). Blood glucose levels at exhaustion (1.33 mumol/g) were only 37% of preexercise levels. There were no significant differences between continuous and intermittent exercise groups for any of the tissue glycogen or blood glucose values. Cardiac muscle was the only tissue capable of complete restoration of glycogen levels while relying exclusively upon endogenous substrates. Concentrations of endogenous substrates present at the end of exercise were insufficient to support restoration of blood glucose levels to preexercise values nor support glycogen repletion in skeletal muscle and liver during the initial 4-h food-restricted postexercise period. With subsequent feeding, skeletal muscle demonstrated a glycogen supercompensation effect at 24 h (181.1 and 191.8% of preexercise levels for continuous and intermittent exercise, respectively). Lactate concentration in all tissues at the point exhaustion (1.5--2.5 times resting levels) were only moderately elevated and returned to preexercise levels within 15 min. It was concluded that lactate removal after exercise contributed only minimally to the repletion of muscle glycogen.

scholarly journals MON-613 The Expression of TBC1 Domain Family, Member 4 (TBC1D4) in Skeletal Muscles of Insulin-Resistant Mice in Response to Sulforaphane

2020 ◽  
Vol 4 (Supplement_1) ◽  
Author(s):  
Nasser M Rizk ◽  
Amina Saleh ◽  
Abdelrahman ElGamal ◽  
Dina Elsayegh ◽  
Isin Cakir ◽  
...  
Keyword(s):  
Gene Expression ◽  
Skeletal Muscle ◽  
Blood Glucose ◽  
Insulin Sensitivity ◽  
Skeletal Muscles ◽  
Glucose Disposal ◽  
Domain Family ◽  
Insulin Resistant ◽  
Glucose Levels ◽  
Blood Glucose Levels

Abstract The Expression of TBC1 Domain Family, member 4 (TBC1D4) in Skeletal Muscles of Insulin-Resistant Mice in Response to Sulforaphane. Background: Obesity is commonly accompanied by impaired glucose homeostasis. Decreased glucose transport to the peripheral tissues, mainly skeletal muscle, leads to reduced total glucose disposal and hyperglycemia. TBC1D4 gene is involved in the trafficking of GLUT4 to the outer cell membrane in skeletal muscle. Sulforaphane (SFN) has been suggested as a new potential anti-diabetic compound acting by reducing blood glucose levels through mechanisms not fully understood (1). The aim of this study is to investigate the effects SFN on TBC1D4 and GLUT4 gene expression in skeletal muscles of DIO mice, in order to elucidate the mechanism(s) through which SFN improves glucose homeostasis. Methodology: C57BL/6 mice (n=20) were fed with a high fat diet (60%) for 16 weeks to generate diet induced obese (DIO) mice with body weights between 45–50 gm. Thereafter, DIO mice received either SFN (5mg/kg BW) (n=10) or vehicle (n=10) as controls daily by intraperitoneal injections for four weeks. Glucose tolerance test (1g/kg BW, IP) and insulin sensitivity test (ITT) were conducted (1 IU insulin/ g BW, IP route) at the beginning and end of the third week of the injection. At the end of 4 weeks of the injection, samples of blood and skeletal muscles of both hindlimbs were collected. The expression levels of GLUT4 and TBC1D4 genes were analyzed by qRT-PCR. Blood was also used for glucose, adiponectin and insulin measurements. Results: SFN-treated DIO mice had significantly lower non-fasting blood glucose levels than vehicle-treated mice (194.16 ± 14.12 vs. 147.44 ± 20.31 mg/dL, vehicle vs. SFN, p value=0.0003). Furthermore, GTT results indicate that the blood glucose levels at 120 minutes after glucose infusion in was (199.83±34.53 mg/dl vs. 138.55±221.78 mg/dl) for vehicle vs. SFN with p=0.0011 respectively. ITT showed that SFN treatment did not enhance insulin sensitivity in DIO mice. Additionally, SFN treatment did not significantly change the expression of TBC1D4, and GLUT4 genes in skeletal muscles compared to vehicle treatment (p values >0.05). Furthermore, SFN treatment did not significantly affect the systemic insulin (1.84±0.74 vs 1.54±0.55 ng/ml, p=0.436), or adiponectin (11.96 ±2.29 vs 14.4±3.33 ug/ml, p=0.551) levels in SFN vs. vehicle-treated DIO mice, respectively. Conclusion: SFN treatment improves glucose disposal in DIO mice, which is not linked to the gene expression of GLUT4 and TBC1D4 and its mechanism of glucose disposal in skeletal muscles. Furthermore, SFN treatment did not improve insulin level, and the insulin sensitizer hormone adiponectin as potential players for enhancing insulin sensitivity. 1. Axelsson AS, Tubbs E, Mecham B, Chacko S, Nenonen HA, Tang Y, et al. Sci Transl Med. 2017;9(394).

scholarly journals PENGARUH BENTONIT PER ORAL TERHADAP PENURUNAN KADAR GLUKOSA DARAH TIKUS MODEL DIABETES MELITUS YANG DIINDUKSI ALOKSAN MONOHIDRAT

2021 ◽  
Vol 3 (2) ◽  
pp. 45
Author(s):  
Galuh Alviana ◽  
Hendro Sudjono Yuwono ◽  
Nova Sylviana
Keyword(s):  
Diabetes Mellitus ◽  
Blood Glucose ◽  
Blood Glucose Concentration ◽  
Control Group ◽  
Average Value ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Female Wistar Rats ◽  
Alloxan Monohydrate ◽  
Per Oral

In Indonesia, it is estimated that there would be increasing in number of diabetes mellitus patients become 12 million cases in 2030. The expensive cost of conventional medications motivates people to find alternative medication. Bentonite is a natural clay which is a good absorbent and frequently called as healing clay for its potency in body detoxification. This study is an experimental research to prove bentonite which is a good absorbent and adsorbent in decreasing blood glucose concentration in diabetes mellitus. Subject of this research is 20 female Wistar rats which weigh 150–250 g. These subjects were divided into two groups: control group and bentonite group. Diabetes is induced by alloxan monohydrate 150mg/kg intraperitoneally, causing β cell necrosis in pancreas. Result of independent t-test showed that bentonite could significantly lower blood glucose levels with average value of 131.30 mg/dL (p=0.010). This concludes that bentonite canreduce blood glucose level in diabetic-induced rats.

scholarly journals Ishige okamurae reduces blood glucose levels in high-fat diet mice and improves glucose metabolism in the skeletal muscle and pancreas

2020 ◽  
Vol 23 (1) ◽  
Author(s):  
Hye-Won Yang ◽  
Myeongjoo Son ◽  
Junwon Choi ◽  
Seyeon Oh ◽  
You-Jin Jeon ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Blood Glucose ◽  
Glucose Metabolism ◽  
Blood Glucose Level ◽  
High Fat Diet ◽  
Saline Group ◽  
High Fat ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Ishige Okamurae

Abstract Brown alga (Ishige okamurae; IO) dietary supplements have been reported to possess anti-diabetic properties. However, the effects of IO supplements have not been evaluated on glucose metabolism in the pancreas and skeletal muscle. C57BL/6 N male mice (age, 7 weeks) were arranged in five groups: a chow diet with 0.9% saline (NFD/saline group), high-fat diet (HFD) with 0.9% saline (HFD/saline group). high-fat diet with 25 mg/kg IO extract (HFD/25/IOE). high-fat diet with 50 mg/kg IO extract (HFD/50/IOE), and high-fat diet with 75 mg/kg IO extract (HFD/75/IOE). After 4 weeks, the plasma, pancreas, and skeletal muscle samples were collected for biochemical analyses. IOE significantly ameliorated glucose tolerance impairment and fasting and 2 h blood glucose level in HFD mice. IOE also stimulated the protein expressions of the glucose transporters (GLUTs) including GLUT2 and GLUT4 and those of their related transcription factors in the pancreases and skeletal muscles of HFD mice, enhanced glucose metabolism, and regulated blood glucose level. Our results suggest Ishige okamurae extract may reduce blood glucose levels by improving glucose metabolism in the pancreas and skeletal muscle in HFD-induced diabetes.

scholarly journals Oral administration of NPC43 counters hyperglycemia and activates insulin receptor in streptozotocin-induced type 1 diabetic mice

2020 ◽  
Vol 8 (1) ◽  
pp. e001695
Author(s):  
Zi-Jian Lan ◽  
Zhenmin Lei ◽  
Lucinda Nation ◽  
Xian Li ◽  
Alexandros Yiannikouris ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Blood Glucose ◽  
Mouse Model ◽  
Oral Administration ◽  
Insulin Receptor ◽  
Hepatic Expression ◽  
Protein Levels ◽  
Glucose Levels ◽  
Blood Glucose Levels

IntroductionAdenosine, 5’-Se-methyl-5’-seleno-,2’,3’-diacetate (NPC43) is a recently identified small, non-peptidyl molecule which restores normal insulin signaling in a mouse model of type 2 diabetes (Lan et al). The present study investigated the ability of NPC43 as an oral and injectable insulin-replacing agent to activate insulin receptor (INSR) and counter hyperglycemia in streptozotocin (STZ)-induced type 1 diabetic (T1D) mice.Research design and methodsIn this study, STZ was intraperitoneally injected into wild-type mice to induce hyperglycemia and hypoinsulinemia, the main features of T1D. These STZ-induced T1D mice were given NPC43 orally or intraperitoneally and blood glucose levels were measured using a glucometer. Protein levels of phosphorylated and total Insrβ, protein kinase B (Akt) and AS160 (critical for glucose uptake) in the skeletal muscle and liver of STZ-induced T1D mice following oral NPC43 treatment were determined by western blot analysis. In addition, hepatic expression of activated Insr in STZ-induced T1D mice after intraperitoneal NPC43 treatment was measured by ELISA. Student’s t-test was used for statistical analysis.ResultsOral administration of NPC43 at a dose of 5.4 or 10.8 mg/kg body weight (mpk) effectively lowered blood glucose levels in STZ-induced T1D mice at ≥1 hour post-treatment and the glucose-lowering activity of oral NPC43 persisted for 5 hours. Blood glucose levels were also reduced in STZ-induced T1D mice following intraperitoneal NPC43 (5.4 mpk) treatment. Protein levels of phosphorylated Insrβ, Akt and AS160 were significantly increased in the skeletal muscle and liver of STZ-induced T1D mice after oral NPC43 (5.4 mpk) treatment. In addition, activation of hepatic Insr was observed in STZ-induced T1D mice following intraperitoneal NPC43 (5.4 mpk) treatment.ConclusionsWe conclude that NPC43 is a de facto fast-acting oral and injectable insulin mimetic which activates Insr and mitigates hyperglycemia in a mouse model of T1D.

scholarly journals Regulation of Postabsorptive and Postprandial Glucose Metabolism by Insulin-Dependent and Insulin-Independent Mechanisms: An Integrative Approach

Nutrients ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 159
Author(s):  
George D. Dimitriadis ◽  
Eirini Maratou ◽  
Aikaterini Kountouri ◽  
Mary Board ◽  
Vaia Lambadiari
Keyword(s):  
Skeletal Muscle ◽  
Blood Glucose ◽  
Glucose Homeostasis ◽  
Glucose Production ◽  
Postprandial Glucose ◽  
Mass Action ◽  
Glucose Disposal ◽  
Nonesterified Fatty Acids ◽  
Glucose Levels ◽  
Blood Glucose Levels

Glucose levels in blood must be constantly maintained within a tight physiological range to sustain anabolism. Insulin regulates glucose homeostasis via its effects on glucose production from the liver and kidneys and glucose disposal in peripheral tissues (mainly skeletal muscle). Blood levels of glucose are regulated simultaneously by insulin-mediated rates of glucose production from the liver (and kidneys) and removal from muscle; adipose tissue is a key partner in this scenario, providing nonesterified fatty acids (NEFA) as an alternative fuel for skeletal muscle and liver when blood glucose levels are depleted. During sleep at night, the gradual development of insulin resistance, due to growth hormone and cortisol surges, ensures that blood glucose levels will be maintained within normal levels by: (a) switching from glucose to NEFA oxidation in muscle; (b) modulating glucose production from the liver/kidneys. After meals, several mechanisms (sequence/composition of meals, gastric emptying/intestinal glucose absorption, gastrointestinal hormones, hyperglycemia mass action effects, insulin/glucagon secretion/action, de novo lipogenesis and glucose disposal) operate in concert for optimal regulation of postprandial glucose fluctuations. The contribution of the liver in postprandial glucose homeostasis is critical. The liver is preferentially used to dispose over 50% of the ingested glucose and restrict the acute increases of glucose and insulin in the bloodstream after meals, thus protecting the circulation and tissues from the adverse effects of marked hyperglycemia and hyperinsulinemia.

Gene expression analysis of the liver and skeletal muscle of psyllium-treated mice

2012 ◽  
Vol 109 (3) ◽  
pp. 383-393 ◽  
Author(s):  
Naoyuki Togawa ◽  
Rumiko Takahashi ◽  
Shizuka Hirai ◽  
Tatsunobu Fukushima ◽  
Yukari Egashira
Keyword(s):  
Gene Expression ◽  
Skeletal Muscle ◽  
Fatty Acid ◽  
Blood Glucose ◽  
Total Cholesterol ◽  
Lipid Transport ◽  
Acid Oxidation ◽  
Plasma Total Cholesterol ◽  
Glucose Levels ◽  
Blood Glucose Levels

Psyllium, a dietary fibre rich in soluble components, has both cholesterol- and TAG-lowering effects. Many studies have verified these actions using liver samples, whereas little information is available on the effects of psyllium treatment on other organs. The purpose of the present study was to evaluate the possible beneficial effects of psyllium. We investigated the gene expression profiles of both liver and skeletal muscle using DNA microarrays. C57BL/6J mice were fed a low-fat diet (LFD; 7 % fat), a high-fat diet (HFD; 40 % fat) or a HFD with psyllium (40 % fat+5 % psyllium; HFD+Psy) for 10 weeks. Body weights and food intake were measured weekly. After 10 weeks, the mice were killed and tissues were collected. Adipose tissues were weighed, and plasma total cholesterol and TAG blood glucose levels were measured. The expression levels of genes involved in glycolysis, gluconeogenesis, glucose transport and fatty acid metabolism were measured by DNA microarray in the liver and skeletal muscle. In the HFD+Psy group, plasma total cholesterol, TAG and blood glucose levels significantly decreased. There was a significant reduction in the relative weight of the epididymal and retroperitoneal fat tissue depots in mice fed the HFD+Psy. The expression levels of genes involved in fatty acid oxidation and lipid transport were significantly up-regulated in the skeletal muscle of the HFD+Psy group. This result suggests that psyllium stimulates lipid transport and fatty acid oxidation in the muscle. In conclusion, the present study demonstrates that psyllium can promote lipid consumption in the skeletal muscle; and this effect would create a slightly insufficient glucose state in the liver.

scholarly journals Ca2+-Dependent Glucose Transport in Skeletal Muscle by Diphlorethohydroxycarmalol, an Alga Phlorotannin: In Vitro and In Vivo Study

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Hye-Won Yang ◽  
Yun-Fei Jiang ◽  
Hyo-Geun Lee ◽  
You-Jin Jeon ◽  
BoMi Ryu
Keyword(s):  
Skeletal Muscle ◽  
Blood Glucose ◽  
Glucose Transport ◽  
Troponin I ◽  
Transport Pathway ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Skeletal Myotubes

Diphlorethohydroxycarmalol (DPHC), a type of phlorotannin isolated from the marine alga Ishige okamurae, reportedly alleviates impaired glucose tolerance. However, the molecular mechanisms of DPHC regulatory activity and by which it exerts potential beneficial effects on glucose transport into skeletal myotubes to control glucose homeostasis remain largely unexplored. The aim of this study was to evaluate the effect of DPHC on cytosolic Ca2+ levels and its correlation with blood glucose transport in skeletal myotubes in vitro and in vivo. Cytosolic Ca2+ levels upon DPHC treatment were evaluated in skeletal myotubes and zebrafish larvae by Ca2+ imaging using Fluo-4. We investigated the effect of DPHC on the blood glucose level and glucose transport pathway in a hyperglycemic zebrafish. DPHC was shown to control blood glucose levels by accelerating glucose transport; this effect was associated with elevated cytosolic Ca2+ levels in skeletal myotubes. Moreover, the increased cytosolic Ca2+ level caused by DPHC can facilitate the Glut4/AMPK pathways of the skeletal muscle in activating glucose metabolism, thereby regulating muscle contraction through the regulation of expression of troponin I/C, CaMKII, and ATP. Our findings provide insights into the mechanism of DPHC activity in skeletal myotubes, suggesting that increased cytosolic Ca2+ levels caused by DPHC can promote glucose transport into skeletal myotubes to modulate blood glucose levels, thus indicating the potential use of DPHC in the prevention of diabetes.

scholarly journals Nrf2-Mediated Regulation of Skeletal Muscle Glycogen Metabolism

2016 ◽  
Vol 36 (11) ◽  
pp. 1655-1672 ◽  
Author(s):  
Akira Uruno ◽  
Yoko Yagishita ◽  
Fumiki Katsuoka ◽  
Yasuo Kitajima ◽  
Aki Nunomiya ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Blood Glucose ◽  
Muscle Glycogen ◽  
Glycogen Content ◽  
Glycogen Metabolism ◽  
C2c12 Myotubes ◽  
Branching Enzyme ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Glycogen Branching Enzyme

Nrf2 (NF-E2-related factor 2) contributes to the maintenance of glucose homeostasisin vivo. Nrf2 suppresses blood glucose levels by protecting pancreatic β cells from oxidative stress and improving peripheral tissue glucose utilization. To elucidate the molecular mechanisms by which Nrf2 contributes to the maintenance of glucose homeostasis, we generated skeletal muscle (SkM)-specificKeap1knockout (Keap1MuKO) mice that express abundant Nrf2 in their SkM and then examined Nrf2 target gene expression in that tissue. InKeap1MuKOmice, blood glucose levels were significantly downregulated and the levels of the glycogen branching enzyme (Gbe1) and muscle-type PhKα subunit (Phka1) mRNAs, along with those of the glycogen branching enzyme (GBE) and the phosphorylasebkinase α subunit (PhKα) protein, were significantly upregulated in mouse SkM. Consistent with this result, chemical Nrf2 inducers promotedGbe1andPhka1mRNA expression in both mouse SkM and C2C12 myotubes. Chromatin immunoprecipitation analysis demonstrated that Nrf2 binds theGbe1andPhka1upstream promoter regions. InKeap1MuKOmice, muscle glycogen content was strongly reduced and forced GBE expression in C2C12 myotubes promoted glucose uptake. Therefore, our results demonstrate that Nrf2 induction in SkM increases GBE and PhKα expression and reduces muscle glycogen content, resulting in improved glucose tolerance. Our results also indicate that Nrf2 differentially regulates glycogen metabolism in SkM and the liver.

scholarly journals POTENSI JUS BUAH NAGA MERAH (HYLOCEREUS POLYRHIZUS) TERHADAP PERBAIKAN JARINGAN ORGAN OTAK TIKUS (RATTUS NORVEGICUS) DIABETES

2019 ◽  
Vol 8 (2) ◽  
pp. 84-95
Author(s):  
I Gede Gelgel Bayu Surya Putra ◽  
◽  
Dorta Simamora ◽  
Keyword(s):  
Blood Glucose ◽  
Treatment Group ◽  
Rattus Norvegicus ◽  
Diabetic Rats ◽  
Fruit Juices ◽  
P Value ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Dragon Fruit ◽  
Female Wistar Rats

Diabetes mellitus is a metabolic disease characterized by hyperglycemia due to disturbances in insulin secretion, insulin action, or both. The purpose of this study was to analyze the effect of the red dragon fruit juice (Hylocereus polyrhizus) to repair brain organ histopathologic female wistar rats (Rattus norvegicus Wistar strain) with diabetes. This research is a true experiment research with randomized control - group pretest - posttest design and were conducted at the in Vivo Laboratory of Wijaya Kusuma University Surabaya. Twenty five female wistar rats were randomly divided into 5 groups, normal rats group KA (without alloxan induction), diabetic rats group KB (alloxan induction and without given any red dragon fruit juices), treatment group KC (alloxan induction + 2 gr/2,5ml of red dragon fruit juices), treatment group KD (alloxan induction + 4 gr/2,5ml of red dragon fruit juices) and treatment group KE (alloxan induction + 8 gr/2,5ml of red dragon fruit juices). The study was conducted during the period of 16 days with standard feeding adaptations for 7 days. On day 16, all the rats were terminated. Glucose meter is used to measure the levels of blood glucose in rats. Histopathologic observation of rat brain tissue using a microscope Olympus CX21 with Haematoksilin eosin (HE) staining. The results showed the best dose of red dragon fruit juices to decrease blood glucose levels compare between KB and KE with significance p-value = 0.000 (α < 0.05), the blood glucose levels decreased in diabetic rats significantly between KB and KE also decreased in rat brain tissue necrosis with p-value = 0.000 (α <0.05).

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