Dietary whey hydrolysate with exercise alters the plasma protein profile: a comprehensive protein analysis

Exercise-acclimated microbiota improves skeletal muscle metabolism via circulating bile acid deconjugation

Habitual exercise alters the intestinal microbiota composition, which may mediate its systemic benefits. We examined whether transplanting fecal microbiota from trained mice improved skeletal muscle metabolism in high-fat diet (HFD)-fed mice. Fecal samples from sedentary and exercise-trained mice were gavage-fed to germ-free mice. After receiving fecal samples from trained donor mice for 1 week, recipient mice had elevated levels of AMP-activated protein kinase (AMPK) and insulin growth factor-1 in skeletal muscle. In plasma, bile acid (BA) deconjugation was found to be promoted in recipients transplanted with feces from trained donor mice; free-form BAs also induced more AMPK signaling and glucose uptake than tauro-conjugated BAs. The transplantation of exercise-acclimated fecal microbiota improved glucose tolerance after 8 weeks of HFD administration. Intestinal microbiota may mediate exercise-induced metabolic improvements in mice by modifying circulating BAs. Our findings provide insights into the prevention and treatment of metabolic diseases.

Polysorbate 80-induced leaky gut impairs skeletal muscle metabolism in mice

Impaired intestinal permeability can induce systemic inflammation and metabolic disturbance. However, the effect of impaired intestinal permeability on metabolic function in the skeletal muscle is unknown. Dietary polysorbate 80 (PS80), a common emulsifier, has been shown to impair intestinal permeability in mice. Here, we investigated the effect of PS80-induced intestinal permeability on glucose tolerance with metabolic signaling in the skeletal muscle. Male ICR mice were divided into control and PS80 groups. In the PS80 group, PS80 was contained in the drinking water at 1% (w/v). After 4 weeks, plasma fluorescein isothiocyanate (FITC) intensity was measured after orally administering FITC-dextran. Half of the mice in each group underwent running exercises. Metabolic and inflammatory parameters were examined in the blood and skeletal muscle. Plasma FITC and lipopolysaccharide levels were higher in the PS80 group than the control group (p < .01, p = .085). The expression of tumor necrosis factor-α in the skeletal muscle was increased upon PS80 administration (p < .05). Although the homeostasis model assessment ratio was higher in the PS80-fed mice (p < .05), insulin-signaling activity in the muscle did not differ between groups. Muscular pH, mitochondrial cytochrome oxidase activity, and glycogen content after exercise were lower in the PS80 group (p < .05) than the control group. There was a negative correlation between plasma FITC and muscle glycogen levels in the exercised groups (r = -.60, p < .05). These results suggest that daily PS80 intake induces intestinal permeability, leading to glucose intolerance and mitochondrial dysfunction in the skeletal muscle.

Identification of cysteinylated transthyretin, a predictive biomarker of treatment response to partially hydrolyzed guar gum in type 2 diabetes rats, by surface-enhanced laser desorption/ionization time-of-flight mass spectrometry

Recent evidence has indicated that total fiber intake is inversely related to type 2 diabetes risk. The present study aimed to investigate the effects of chronic administration of partially hydrolyzed guar gum (PHGG), a water-soluble dietary fiber, on the occurrence of diabetes and its complications, fatty liver and nephropathy. We also identified predictive serum biomarkers of treatment response to PHGG by mass spectroscopy-based proteomic analysis using Otsuka Long-Evans Tokushima Fatty (OLETF) rats, a good model of human non-insulin-dependent diabetes mellitus. In this study, at 5 weeks of age, OLETF rats and control strain Long-Evans Tokushima Otsuka (LETO) rats were fed a control diet or a high-fiber diet (5% PHGG) for 57 weeks. Body weight, food intake, oral glucose tolerance test, plasma insulin levels, and urine glucose and protein levels were regularly measured. Oral glucose tolerance tests (OGTT) and storage of serum in a deep freezer were conducted at the beginning of the experiment and every 4 weeks after overnight fasting during the experiments. PHGG treatment affected neither meal patterns nor the body weight of OLETF and LETO rats. Repeated measure analysis of variance revealed significant differences in fasting plasma glucose and plasma glucose at 2 h after OGTT between control OLETF (OLETF-C) rats and OLETF rats treated with PHGG (OLETF-F). The glucose response determined by the area under the curve of OGTT was significantly greater in OLETF-C rats than that in OLETF-F rats at 25 weeks of age. HOMA-IR, an index of insulin resistance, increased at 25 weeks of age in OLETF-C rats, while this increase was significantly inhibited in OLETF-F rats. At 62 weeks of age, PHGG treatment significantly improved hepatic steatosis as well as renal mesangial matrix accumulation in OLETF rats. To identify the risk marker for diabetes mellitus by SELDI-TOF MS, we collected sera from 21-week-old individuals. Among the 12 specific peaks that were risk marker candidates for diabetes mellitus, the m/z 13,720 peak was identified as that of cysteinylated transthyretin by sequencing of four tryptic peptides using tandem mass spectrometry and peak distribution around the m/z 13,720 peak in the SELDI-TOF spectra. In conclusion, we found that chronic treatment with PHGG improved insulin resistance, delayed the onset of diabetes, and inhibited the development of diabetic complications, as well as identified cysteinylated transthyretin as a predictive biomarker of treatment response to PHGG in OLETF rats.

Impact of a trimodal prehabilitation program on functional recovery after colorectal cancer surgery: a pilot study

BACKGROUND

Patients undergoing colorectal cancer resections are at risk for delayed recovery. Prehabilitation aims to enhance functional capacity preoperatively for better toleration of surgery and to facilitate recovery. The authors previously demonstrated the limited impact of a prehabilitation program using exercise alone. They propose an expanded trimodal prehabilitation program that adds nutritional counseling, protein supplementation, and anxiety reduction to a moderate exercise program. This study aimed to estimate the impact of this trimodal program on the recovery of functional capacity compared with standard surgical care.

METHODS

Consecutive patients were enrolled in this pre- and postintervention study over a 23-month period. The postoperative recovery for 42 consecutive patients enrolled in the prehabilitation program was compared with that of 45 patients assessed before the intervention began. The primary outcome was functional walking capacity (6-min walk test [6MWT]). The secondary outcomes included self-reported physical activity (CHAMPS questionnaire) and health-related quality of life (SF-36). Data are expressed as mean ± standard deviation or median (interquartile range [IQR]) and were analyzed using Chi-square and Student's t test. All p values lower than 0.05 were considered significant.

RESULTS

The prehabilitation and control groups were comparable in terms of age, gender, body mass index (BMI) and American Society of Anesthesiology (ASA) class. There was no difference in walking capacity at the first assessment (6MWT distance, 422 ± 87 vs 402 ± 57 m; p = 0.21). During the prehabilitation period lasting a median of 33 days (range, 21-46 days), functional walking capacity improved by 40 ± 40 m (p < 0.01). The postoperative complication rates and the hospital length of stay were similar. The patients in the prehabilitation program had better postoperative walking capacity at both 4 weeks (mean difference, 51.5 ± 93 m; p = 0.01) and 8 weeks (mean difference, 84.5 ± 83 m; p < 0.01). At 8 weeks, 81 % of the prehabilitated patients were recovered compared with 40 % of the control group (p < 0.01). The prehabilitation group also reported higher levels of physical activity before and after surgery.

CONCLUSION

In this pilot study, a 1-month trimodal prehabilitation program improved postoperative functional recovery. A randomized trial is ongoing (NCT01356264).