<i>Cannabis sativa</i> L. alleviates loperamide-induced constipation by modulating the composition of gut microbiota in miceOriginal 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?
This study tested whether a water extract of Cannabis sativa seed, a key ingredient in the traditional formula MaZiRenWan, relieves chronic constipation. It examined the role of gut microbiota. Researchers used a loperamide-induced constipation mouse model. They measured intestinal transit, fecal water content, gut barrier and inflammation markers, and anxiety and depression behaviors. A microbiota-depletion experiment tested whether the laxative effect depended on gut bacteria, using 16S ribosomal RNA sequencing to profile the microbiome.
Who was studied?
The model used mice divided into three groups of eight: a blank control, a loperamide constipation group, and a group pretreated with the cannabis seed extract. Constipation was induced by subcutaneous loperamide at 10 milligrams per kilogram twice daily for two weeks. The extract was given by gavage at 1 gram per milliliter. This is a preclinical animal study. A separate arm added antibiotics to deplete the gut flora and test whether the extract still worked.
What were the most important findings?
The extract improved intestinal motility and water-electrolyte metabolism, reduced inflammation, protected the gut barrier, and eased anxiety and depression behaviors in constipated mice. It reversed the loss of barrier molecules and lowered inflammatory factor expression. It also restructured the microbiota, altering bacteria linked to inflammation. Crucially, once the gut flora was depleted by antibiotics, the extract no longer relieved constipation, showing the effect depended on the microbiota.
What are the greatest implications of this study?
The findings support cannabis seed extract as a microbiota-dependent option for constipation, offering a rationale for the traditional MaZiRenWan formula. The benefit tracked with shifts in the gut microbiota. Because flora depletion abolished the effect, gut microbiota appear necessary for the laxative action. This is a mechanistic finding in mice, not a human treatment claim. The authors call for further investigation of the extract for constipation, and human relevance remains to be established in clinical settings.