Résumé
ObjectiveTo observe the effects of the South African herb Hoodia gordonii （HG） on glucolipid metabolism in diabetic db/db mice and explore the possible mechanisms of HG on the liver of db/db mice based on the phosphoinositide-3 kinase （PI3K）/protein kinase B （Akt）/factor forkhead protein O1 （FoxO1） signaling pathway. MethodA total of 30 db/db mice were randomly divided into five groups according to fasting blood glucose： model group， metformin group （0.195 g·kg-1）， and low dose （0.39 g·kg-1）， medium dose （0.78 g·kg-1）， and high dose （1.56 g·kg-1） HG groups， with six m/m mice in each group， and another six m/m mice were set as normal group. The mice in the normal and model groups were given saline of 9 mL·kg-1 by gavage. Body weight， water intake， and fasting blood glucose of the mice in each group were measured weekly. After six weeks of continuous administration， serum insulin （FINS）， low-density lipoprotein cholesterol （LDL）， total cholesterol （TC）， triglyceride （TG）， alanine aminotransferase （ALT）， aspartate aminotransferase （AST）， urea， and creatinine （CREA） were measured， and liver sections were embedded and stained with hematoxylin-eosin （HE）， periodic acid-Schiff （PAS）， and oil red O. Protein expression of PI3K p85， p-Akt， and p-FoxO1 in liver was detected by immunohistochemistry. The mRNA expression of PI3K， Akt， and FoxO1 in liver tissue was detected by real-time polymerase chain reaction （Real-time PCR）. ResultAfter six weeks of administration intervention， it was found that fasting blood glucose was significantly downregulated in mice in the three HG groups （P<0.05）. The level of islet resistance index was significantly reduced in both the low and medium dose HG groups （P<0.05）. The expression levels of TC， TG， and LDL were reduced in all HG groups （P<0.05， P<0.01）. Pathologically， HG could alleviate hepatocyte steatosis， reduce the volume and content of lipid droplets in liver， and increase the distribution of glycogen granules in liver to some extent in mice. Immunohistochemical assays revealed that PI3K p85 protein expression was significantly increased in the low， medium， and high dose HG groups compared with the model group （P<0.01）. p-Akt protein expression was significantly increased in the medium and high dose HG groups （P<0.05， P<0.01）. p-FoxO1 protein expression was significantly increased in the low， medium， and high dose HG groups （P<0.05， P<0.01）. Compared with the model group， PI3K mRNA was increased in low dose， medium dose， and high dose HG groups （P<0.05）， and Akt mRNA was increased in high dose HG group （P<0.05）. FoxO1 mRNA was decreased in low dose， medium dose， and high dose HG groups （P<0.05）. ConclusionHG can ameliorate the disorder of glucolipid metabolism in db/db mice， which may be related to its activation of the hepatic PI3K/Akt/FoxO1 signaling pathway.
Résumé
ABSTARCT AIM: To investigate the effect of Ginkgo biloba extract (GBE) on kidney injury in rats with chronic renal failure (CRF) and its potential molecular mechanism. METHODS: SD rats were given 5/6 nephrectomy to construct CRF models and divided into model group, GBE group (100 mg /kg), GBE+ Agomir-NC group, and GBE+Agomir-145 group, 12 per group; another 12 were selected as the sham group, with only the kidney exposed and no nephrectomy. Rats in the GBE group were given GBE 100 mg/kg gavage daily, once a day, for 4 consecutive weeks; rats in the GBE+Agomir-NC group and GBE+Agomir-145 group were given GBE 100 mg/kg gavage daily, and then Agomir-NC and Agomir-145 were injected via the tail vein every 3 days for 4 weeks; the sham group and the model group were given the same amount of normal saline by gavage and injection through the tail vein respectively. The general state of the rat was observed, and the renal function indicators [24 h urine microalbumin (24 h UAlb), blood urea nitrogen (BUN), blood creatinine (SCr)] and oxidative stress indicators [malonaldehyde (MDA), Superoxide dismutase (SOD), glutathione peroxidase (GSH-Px)] were detected, Masson staining was used to observe the fibrosis of kidney tissue, real-time fluorescent quantitative PCR (RT-qPCR) was used to detect the mRNA expression levels of microRNA-145 (miR-145), transforming growth factor - β1 (TGF - β1) and forkhead box O1 (FOXO1) in renal tissue, Western blot was used to detect the protein levels of TGF - β1 and FOXO1 in kidney tissue. RESULTS: The general state of CRF rats improved significantly after GBE intervention, the body weight, renal tissue SOD and GSH-Px activities, and FOXO1 mRNA and protein levels were significantly higher than those in the model group (P<0.05); the 24 h UAlb, serum BUN, SCr and renal tissue MDA levels, the relative area of renal interstitial fibrosis, and renal tissue miR-145, TGF - β1 mRNA and protein levels were significantly lower than those in the model group (P<0.05); and on the basis of GBE intervention, up-regulating the expression of miR-145 could significantly weaken the protective effect of GBE on renal injury in CRF rats (P<0.05). CONCLUSION: GBE can alleviate kidney damage in CRF rats, and its mechanism of action may be related to down-regulation of miR-145, up-regulation of FOXO1 expression, and inhibition of renal fibrosis.
Résumé
Objective:To explore the effect of hyperbaric oxygen (HBO) on the blood-brain barrier via the silent information regulator 1 (SIRT1)/Forkhead box O1(FoxO1) signaling pathway after cerebral ischemia and reperfusion using a rat model.Methods:Forty Wistar rats were randomly assigned into sham, cerebral ischemia-reperfusion (CIR), CIR+ HBO and CIR+ HBO+ EX527 groups, each of 10. The cerebral ischemia-reperfusion model was established in all groups except the sham group by right middle cerebral artery occlusion using the modified thread-occlusion method. The sham group was not ligated. Both the CIR+ HBO and CIR+ HBO+ EX527 groups were given HBO 1, 9, 21, 45 and 69 hours after the reperfusion. The CIR+ HBO+ EX527 group was additionally injected with 5mg/kg of EX527(a SIRT1inhibitor) peritoneally 4, 12, 24, 48 and 72 hours after the reperfusion. Then 2% Evens blue (EB) was injected into the tail vein an hour before the rats were sacrificed. The content of EB and the expression of SIRT1, FoxO1, ZO-1, Occludin, Claudin-5 mRNA and their proteins were determined using spectrophotometry, reverse transcription-polymerase chain reactions and Western blotting.Results:The average EB content of the hippocampal brain tissue from the CIR, CIR+ HBO and CIR+ HBO+ EX527 rats was significantly greater than the Sham group′s average 72h after reperfusion. The average expression of SIRT1, FoxO1, ZO-1, Occludin and Claudin-5 mRNA and their proteins was significantly lower, with the CIR + HBO + EX 527 group′s average significantly lower than that of the CIR+ HBO group.Conclusions:HBO can increase the expression of tight junction protein via the SIRT1/FoxO1 pathway. It helps to protect the blood-brain barrier in CIR injury situations.
Résumé
The potential medicinal value of Ma bamboo (Dendrocalamus latiflorus), one of the most popular and economically important bamboo species in China, has been underestimated. In the present study, we found that D. latiflorus leaf extract (DLE) reduced fasting blood glucose levels, body weight, and low-density lipoprotein cholesterol with low liver toxicity in db/db mice. In addition, gene expression profiling was performed and pathway enrichment analysis showed that DLE affected metabolic pathways. Importantly, DLE activated the AKT signaling pathway and reduced glucose production by downregulating glucose-6-phosphatase (G6PC) and phosphoenolpyruvate carboxykinase 1 (PCK1) expression. Moreover, network pharmacology analysis identified rutin as an active component in DLE through targeting insulin growth factor 1 receptor (IGF1R), an upstream signaling transducer of AKT. Due to its hypoglycemic effects and low toxicity, DLE may be considered an adjuvant treatment option for type 2 diabetes patients.
Résumé
ObjectiveTo observe the effects of the water extracts of Trichosanthis Radix-Polygonati Rhizoma at different ratios on glucose and lipid metabolism in KKAy mice with spontaneous type 2 diabetes and explore the mechanism of the extract in alleviating insulin resistance based on phosphatidylinositol 3-kinase （PI3K）/protein kinase B （Akt）/forkhead box O1 （FoxO1） signaling pathway. MethodThe 8-week-old C57BL/6J male mice were taken as the normal control group， and KKAy male mice of the same age were randomly assigned into a model group， a metformin group， Trichosanthis Radix-Polygonati Rhizoma groups at the ratios of 1∶1 （Trichosanthis Radix 30 g， Polygonati Rhizoma 30 g）， 1∶3 （Trichosanthis Radix 15 g， Polygonati Rhizoma 45 g）， and 1∶5 （Trichosanthis Radix 10 g， Polygonati Rhizoma 50 g） according to blood glucose level and body weight， with 6 mice in each group. The administration lasted for 8 weeks， and the body weight （BW） and fasting blood glucose （FBG） of mice were recorded at the same time points of the 2nd， 4th， 6th， and 8th weeks， respectively. Oral glucose tolerance test （OGTT） was performed at the 7th week. After drug administration， the serum levels of total cholesterol （TC）， triglyceride （TG）， low-density lipoprotein cholesterol （LDL-C）， high-density lipoprotein cholesterol （HDL-C）， and fasting insulin （FINS） were measured， and homeostasis model assessment-insulin resistance （HOMA-IR） index was calculated. The liver tissue samples were stained with hematylin-eosin （HE） and periodic acid-Schiff （PAS） for observation of the fat distribution and glycogen content. The protein levels of PI3K， Akt， p-Akt， FoxO1， and p-FoxO1 in the liver were determined by Western blot. ResultCompared with the normal group， the model group showed increased food intake， FBG， glucose tolerance， FINS， HOMA-IR， TC， TG， and LDL-C （P<0.01）， and down-regulated protein levels of PI3K， Akt， phosphorylaison （p）-Akt， FoxO1， and p-FoxO1 in the liver （P<0.01）. Compared with the model group， Trichosanthis Radix-Polygonati Rhizoma lowered FBG and HOMA-IR （P<0.05， P<0.01）. In particular， the combination at the ratio of 1∶3 showed the best performance （P<0.01） comparable to metformin. Furthermore， Trichosanthis Radix-Polygonati Rhizoma at different ratios lowered blood glucose at different time points of OGTT （P<0.05） and TC and LDL-C （P<0.01）. Additionally， the combination at the ratio of 1∶3 reduced TG （P<0.01）. The liver of mice in the drug administration groups showed regular morphology， with few lipid droplets and rich glycogen. Western blot showed that Trichosanthis Radix-Polygonati Rhizoma up-regulated the protein levels of PI3K and p-Akt， down-regulated the protein level of FoxO1， and up-regulated the protein level of p-FoxO1 （P<0.05）. ConclusionTrichosanthis Radix-Polygonati Rhizoma， especially at the ratio of 1∶3， lowered the FBG， TC， LDL-C， and HOMA-IR index， promoted liver glycogen synthesis， and reduced steatosis in KKAy mice， which may be related to the regulation of PI3K/Akt/FoxO1 signaling pathway in the liver.
Résumé
Objective:To study the protective effect of astragaloside (AS) Ⅳ on kidney in type 2 diabetic nephropathy rats and its regulation effect on phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt)/forkhead box O1(FoxO1) signaling, and investigate the mechanism of glycosides against type 2 diabetic nephropathy. Method:After 6 weeks of high-glucose and high-fat diet, rat models of type 2 diabetes were established by intraperitoneal injection of streptozotocin (STZ) (35 mg·kg-1) and randomly divided into model group, AS-Ⅳ (20, 40, 80 mg·kg-1) groups and metformin hydrochloride (positive) group. After 8 weeks of continuous administration, changes in body weight, kidney index, blood glucose, 24-hour urinary protein, urinary microalbumin, urinary creatinine, serum creatinine, and blood urea nitrogen were measured in each group; hematoxylin-eosin (HE) staining was used to observe the pathological changes of renal tissues; Masson trichrome staining was used to observe the collagen expression level. Periodontium hexaammine silver (PASM) staining was used to observe the changes of basement membrane. Immunohistochemistry assay was used to detect phospho-FoxO1(p-FoxO1) protein expression, and Western blot was used to analyze the expression levels of autophagy marker protein PI3K, microtubule-associated protein 1 light chain 3 (LC3)/Ⅱ, B-cell lymphoma-2 (Bcl-2)/adenovirus E1B19 kDa interacting protein 3 (BNIP3), Beclin1, p-Akt, and Akt. Result:As compared with the normal group, the glomerular basement membrane of the model group was thicker; the extracellular matrix was increased; the mesangial was expanded; the collagen was significantly increased; the PI3K/Akt/FoxO1 signal was increased(PPPPPPConclusion:AS-Ⅳ may increase the autophagic activity of renal cells by inhibiting PI3K/Akt/FoxO1 signal, slowing down the development of type 2 diabetic nephropathy.
Résumé
Objective To investigate FoxO1 expression and its time-dependent changes during the skin incised wound healing. Methods After the establishment of the skin incised wound model in mice, the FoxO1 expression of skin in different time periods was detected by immunohistochemistry and Western blotting. Results Immunohistochemistry staining showed that FoxO1 was weakly expressed in a few fibroblasts of epidermis, hair follicles, sebaceous glands, vessel endothelium and dermis in the control group. The FoxO1 expression was enhanced in the epidermis and skin appendages around the wound during 6-12 h after injury, which could be detected in the infiltrating neutrophils and a small number of monocytes. FoxO1 was mainly expressed in monocytes during 1-3 d after injury, and in neovascular endothelial cells and fibroblasts during 5-10 d. On the 14th day after injury, the FoxO1 expression still could be detected in a few fibroblasts. The Western blotting results showed that the FoxO1 expression quantity of the tissue samples in injury group was higher than in control group. The FoxO1 expression peaked at 12 h and 7 d after injury. Conclusion FoxO1 is time-dependently expressed in skin wound healing, which can be a useful marker for wound age determination.
Résumé
Objective To study the remodeling of alveolar bone and change in expression of forkhead box O1 (FOXO1) during orthodontic tooth movement (OTM) in rat, so as to preliminarily investigate the role of FOXO1 in alveolar bone remodeling induced by orthodontic force. Methods The rat OTM models were established and the left maxillary 1st molars were moved with force of 50 g. The rats were executed on the 1st, 3rd and 7th day of OTM, respectively. HE staining and immunohistochemical staining were used to observe the remodeling of alveolar bone in the inter-radicular region of the 1st molars and expression of FOXO1 at different time points during OTM. Results The 1st molars were constantly moved mesially under orthodontic force. There were more osteoclasts in the alveolar bone of OTM group than that in non-OTM group, and the osteoclasts on the 3rd day of OTM showed the highest activity. The number of active osteoblasts gradually increased in the inter-radicular region of alveolar bone under orthodontic force, with the enhanced osteoblast activity. Expression of FOXO1 in OTM group was elevated compared with non-OTM group. Most osteoblasts in alveolar bone during OTM were FOXO1 positive, and the expression of FOXO1 was gradually increased with the number of osteoblasts increasing. Conclusions Orthodontic force induces bone remodeling of alveolar bone in the inter-radicular region during OTM, and the change in FOXO1 expression may be related to alveolar bone remodeling during OTM.