Archives of Physiology and Biochemistry最新文献

Objective: Maximum-voluntary-ventilation (MVV) is the maximal volume of which an individual can move by voluntary effort in one minute. It is possible that the first second forced-expiratory-volume (FEV₁) could be more to reliable assess respiratory muscle endurance to estimate MVV.

Methods: For this aim, 422 athletes (Age 22.9 ± 8.5 years; 98/324 - females/males) were performed a MVV, and FEV₁ measurements.

Results: The coefficient of determination was R² = 0.594 between MVV and FEV₁, with a predictive equation for overall participants: MVV = (FEV₁ × 33.5)+12.7. The robust regression showed a good multiple correlation coefficient (R = 0.815) with the coefficient of determination R² = 0.661 for the model including FEV₁, age and gender as predictors. These equations MVV = (FEV₁ X 27.3)+(Age(y) × 1.1)+20.5 and MVV = (FEV₁ × 27.3)+(Age(y) × 1.1) were derived for male and female, respectively.

Conclusion: FEV₁ can predict MVV in different athletes with greater accuracy when stratified per gender. Therefore, this new approach can be used in a short all-out test without stress of the respiratory muscle to predict MVV in athletes.

Methods: This case-control study looked at a total of 104 university students, 51 individuals with obesity, and 53 individuals as controls. Biochemical measurements by the colorimetric method include zinc and copper. Genetic analysis by the tetra primers ARMS-PCR was used for genotyping the rs180113 SNP in the MTHFR gene.

Results: Serum zinc levels were significantly higher in the obese group compared to the non-obese group (145.1 ± 24.89 ug/dl vs. 114.8 ± 29.44 ug/dl, p = 0.0133), while copper levels showed no significant difference. Genotyping revealed the rs1801133 polymorphism in the MTHFR gene is significantly associated with obesity, with the A allele more frequent in obese individuals (39.6% vs. 14.5%, p < 0.05).

Conclusion: Zn and rs1801133 are associated with obesity, the A allele of rs1801133 SNP and the significant associations observed in different genetic models highlight the potential of this polymorphism as a genetic marker for obesity risk.

Background: This study investigates Berberine's (BBR) impact on metabolic and bone changes in ovariectomized rats, a model for postmenopausal conditions.

Methods: Sixty adult female rats divided into six groups: control, sham ovariectomized, ovariectomized, and three BBR treated ovariectomized groups (50, 100, and 200 mg/kg/day, for eight weeks). Measurements included serum oestradiol, glucose, HOMA-IR, lipid profile , tumour necrosis factor alpha (TNF-α), oxidative stress markers , osteocalcin (OC), bone-specific alkaline phosphatase (ALP), cross-linked Carboxy-terminal telopeptide of type I collagen (CTX-I), and bone tissue analysis.

Results: Ovariectomized rats exhibited significant metabolic and bone deterioration, such as increased glucose, insulin, HOMA IR, total cholestrol (TC), LDL-C, TNF-α, OC, ALP, CTX-I, and MDA levels, alongside decreased oestradiol, HDL-C, and GSH levels, and DNA fragmentation (P < 0.001). BBR treatment showed dose-dependent improvements in all parameters.

Conclusion: BBR demonstrates significant ameliorative effects on metabolic and bone health in ovariectomized rats, highlighting its potential therapeutic benefits for postmenopausal conditions.

Metformin is used as a first-line treatment of type 2 diabetes mellitus (T2DM) and is effective as monotherapy and in combination with other glucose-lowering medications. Lepidine, a natural product found in Lepidium sativum, had antidiabetic, antioxidant, anticancer, anti-inflammatory, and hypolipidemic effects. This study aimed to assess the effects of lepidine alone and in combination with metformin in nicotinamide (NA)/streptozotocin (STZ)-induced diabetic Wistar rats. T2DM was induced by intraperitoneal injection of NA 15 minutes before intraperitoneal injection of STZ. Diabetic rats were orally treated with lepidine (20 mg/kg body weight) and/or metformin (70 mg/kg body weight) every other day for four weeks. Both lepidine and metformin treated diabetic rats showed a significant decrease in fasting blood glucose (FBG), amelioration of serum lipid profile, increase in serum insulin, and C-peptide , and downregulation in the elevated serum tumour necrosis α (TNF-α) level in association with the improvement in the pancreatic islet integrity and function. In conclusion, the lepidine has potent anti-diabetic effects and may add more to the therapeutic value of metformin when the two agents are used in combination. However, further clinical studies on human beings with T2DM are required to assess the efficacy and safety of the combination of metformin and lepidine before its approval and therapeutic application.

Objective: Androgenic steroids abuse among young athletes has long-term health consequences, causing profound damage to vital organs such as the heart, blood vessels, brain, liver, gonads, kidneys, and skin.

Results: In the vessels, steroids cause plaque formation, vascular calcification, thrombosis, and coronary artery disease, and in the heart, they lead to pathological fibrosis, dilated cardiomyopathy, heart failure, fatal ventricular arrhythmias, acute myocardial infarction, and reduced ejection fraction. The brain also suffers from cognitive decline, memory impairment, and a constellation of neurotransmitter abnormalities that lead to depression. In the liver, the consequences are severe and manifest as increased oxidative stress, liver dysfunction, hepatotoxicity, cholestatic jaundice, liver tumours, cell death, and elevations in liver enzymes, bilirubin, and cholesterol. Male athletes experience testicular atrophy, temporary suppression of spermatogenesis, hypogonadism, reduced fertility, infertility, and hormonal imbalance. In contrast, women experience ovarian dysfunction and menstrual irregularities. In the kidney, steroids lead to increased inflammatory cytokines, fibrosis, renal tubular hypertrophy, glomerular changes, and structural damage, and show higher levels of serum creatinine, urinary protein, and cystatin C. In athletes, steroids can lead to various skin problems such as acne, gynecomastia, prostatitis, and alopecia.

Objective: Metformin is an anti-diabetic drug used to control blood glucose levels. The effects of metformin on insulin sensitivity in inflammation-induced adipocytes are not fully understood.This study aimed to explore the mechanism of metformin on insulin sensitivity enhancement in the coculture of LPS-induced 3T3-L1 adipocytes and RAW 264.7 macrophages.

Material and methods: Insulin resistance was induced in coculture cells using Lipopolysaccharide, followed by adding 25, 50, and 100 µg/ml of metformin for 24 h of incubation. Glucose consumption, GLUT-4, IRS-1, and IL-6 mRNA expressions were quantified.

Results: Metformin, starting at a concentration of 25 µg/ml, enhanced glucose consumption, upregulated GLUT-4 mRNA expression, and stimulated the expression of IRS-1 mRNA in coculture cells at 100 µg/ml of concentration. Additionally, Metformin inhibited inflammation by reducing IL-6 mRNA expression in coculture cells up to 100 µg/ml.

Discussion and conclusion: These findings suggest that metformin attenuated inflammation and improved insulin sensitivity in inflammation-induced adipocytes that may be mediated by the IRS-1/GLUT-4 pathway.

Objective: In recent years, it has been known that the melatonin hormone, secreted from the pineal gland, possesses significant antioxidant activity. This study explores the therapeutic effect of melatonin on the deleterious effects of deltamethrin, a pyrethroid pesticide extensively used worldwide, including in Türkiye, on mouse liver cells.

Methods: Hepatocytes from Balb/C mice were isolated using a two-stage perfusion method, resulting in over 85% live hepatocytes. The isolated cells were cultured with different doses of deltamethrin (1 and 10 µM) and melatonin (100 µM) for 24 and 48 hours. At the conclusion of the culture period, hepatocytes were extracted at the 24th and 48th hours, and Malondialdehyde (MDA), Total Antioxidant Capacity (TAC), Total Oxidation Status (TOS), and DNA damages (8-hydroxy-2'-deoxyguanosine (8-OHdG)) were examined.

Results: While an increase in MDA, TOS, and DNA damage was observed in the deltamethrin-administered groups of hepatocytes, a decrease in TAC level was noted. It was determined that the applied deltamethrin had no effect on cell viability throughout the application period.

Conclusion: Furthermore, it was observed that melatonin, when administered concurrently with deltamethrin, reduced the toxic effect of deltamethrin. This study suggests that melatonin has a protective effect against deltamethrin-induced damage in mouse hepatocyte cells.

Diabetic skin wound is a disturbing and rapidly evolving clinical issue. Here, we investigated how salvianolic acid B (Sal B) affected the diabetic wound healing process. Following Sal B administration, histopathological damage was investigated by H&E and Masson staining, and CD34, apoptosis and mitophagy markers were measured by immunofluorescence, immunohistochemistry, and western blotting. Migration, proliferation, and mitochondrial function of high glucose (HG) -induced HMEC-1 cells were measured. The effects of si-Parkin on endothelial cell migration, apoptosis and mitochondrial autophagy were examined. Sal B alleviated inflammatory cell infiltration and promoted angiogenesis in skin wound tissue. Apoptosis and mitophagy were ameliorated by Sal B in diabetic skin wound tissues and HG-induced HMEC-1 cells. Parkin inhibition impaired the migratorypromoted cell apoptosis and inhibited mitophagy of HMEC-1 cells. This finding demonstrated that Sal B promoted diabetic skin wound repair via Pink1/Parkin-mediated mitophagy, improved our understanding of the diabetic wound healing process.

Background: Mirabegron (MIRG) is a type of β3 adrenoceptor agonist that is considered an alternative therapy for the treatment of overactive bladder (OAB) symptoms. Cilostazol (CITZ) is a selective inhibitor of phosphodiesterase (III) that has various pharmacological effects.

Objectve: The current study aimed to highlight the regulatory effects of CITZ on MIRG-induced toxicity.

Materials and methods: Male rats were divided into six groups. Blood samples were collected to determine different hepatic and kidney function levels along with serum protein electrophoresis and inflammatory factor levels. Histopathological studies and oxidative stress (OS) were also assessed. Kidney and hepatic damage were detected following the administration of MIRG, especially at high doses, due to elevated OS, inflammation, and apoptotic marker levels.

Results: Rats receiving CITZ exhibited significant improvements in both hepatic and kidney functions, with decreased inflammation and OS.

Conclusion: CITZ administration plays a beneficial role in alleviating hepatic and nephrotoxicity induced by MIRG by inhibiting OS and inflammation.