Critical role of down-regulated in adenoma bicarbonate transporter in linaclotide stimulated intestinal bicarbonate secretion.
Jessica B SarthiAnnie M TrumbullShayda M AbazariVincent van UnenJoshua E ChanNam Soo JooYanfen JiangCalvin J KuoZachary M SellersPublished in: bioRxiv : the preprint server for biology (2023)
Duodenal bicarbonate secretion is critical to epithelial protection, nutrient digestion/absorption and is impaired in cystic fibrosis (CF). We examined if linaclotide, typically used to treat constipation, may also alter duodenal bicarbonate secretion. Bicarbonate secretion was measured in vivo and in vitro using mouse and human duodenum. Ion transporter localization was identified with confocal microscopy and de novo analysis of human duodenal single cell RNA sequencing (sc-RNAseq) was performed. Linaclotide increased bicarbonate secretion in mouse and human duodenum in the absence of CFTR expression or function. Linaclotide-stimulated bicarbonate secretion was eliminated by down-regulated in adenoma (DRA) inhibition, regardless of CFTR activity. Sc-RNAseq identified that 70% of villus cells expressed SLC26A3 , but not CFTR , mRNA. Linaclotide increased apical membrane expression of DRA in non-CF and CF differentiated enteroids. These data provide insights into the action of linaclotide and suggest linaclotide may be a useful therapy for CF individuals with impaired bicarbonate secretion.
Keyphrases
- cystic fibrosis
- pseudomonas aeruginosa
- endothelial cells
- single cell
- lung function
- poor prognosis
- induced apoptosis
- rna seq
- machine learning
- oxidative stress
- cell death
- electronic health record
- endoplasmic reticulum stress
- cell cycle arrest
- long non coding rna
- chronic obstructive pulmonary disease
- anaerobic digestion