Gut microbiota composition in male rat models under different nutritional status and physical activity and its association with serum leptin and ghrelin levelsOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Forty male Sprague Dawley rats were divided into four groups combining food restriction or ad libitum feeding with or without access to a running wheel, including an activity-based anorexia (ABA) model. Researchers examined how nutritional status and exercise shape fecal microbiota and its links to serum leptin and ghrelin.
How was it studied?
Fecal bacterial composition was profiled using PCR-denaturing gradient gel electrophoresis and real-time qPCR targeting specific phyla and genera. Serum leptin and ghrelin were measured by radioimmunoassay, and correlations with bacterial quantities were calculated using Spearman coefficients and multivariate regression.
What did they find?
Restricted eaters (ABA and control ABA) had significantly higher Proteobacteria, Bacteroides, Clostridium, Enterococcus, Prevotella and Methanobrevibacter smithii, and lower Actinobacteria, Firmicutes, Bacteroidetes, the Blautia coccoides-Eubacterium rectale group, Lactobacillus and Bifidobacterium, compared with unrestricted eaters. Exercise alone raised Lactobacillus, Bifidobacterium and the B. coccoides-E. rectale group relative to the other three groups. Bacterial diversity, measured by DGGE band richness, was lowest in the ABA group (11.16 bands on average) and highest in the ad libitum group (19.0 bands).
Why it matters
Bifidobacterium and Lactobacillus levels correlated positively with serum leptin, while Clostridium, Bacteroides and Prevotella correlated negatively with leptin and positively with ghrelin. The authors conclude gut microbiota composition tracks with nutritional status, exercise and appetite-regulating hormones, suggesting a role in satiety and metabolic control.