Effect of lipopolysaccharide on peptide transporter 1 expression in rat small intestine and its attenuation by dexamethasone. 2002

Hong-Jin Shu, and Hiroaki Takeda, and Haruhide Shinzawa, and Tsuneo Takahashi, and Sumio Kawata
2nd Department of Internal Medicine, Yamagata University School of Medicine, Yamagata, Japan. shuhong@med.id.yamagata-u.ac.jp

OBJECTIVE The peptide transporter (PepT1) activity is upregulated or preserved under certain pathological conditions. The aim of this study was to investigate the PepT1 expression during lipopolysaccharide (LPS) treatment and the effect of dexamethasone on PepT1 expression. METHODS Rats were injected daily for 3 days with (1) LPS; (2) LPS plus dexamethasone; (3) dexamethasone, and (4) saline only. Mucosal specimens were used for Northern blot and Western blot analyses. Tissues of small intestine were taken for histological studies. In addition, tumor necrosis factor alpha and interleukin 1 beta levels were determined 3 h after single injections of the above mediators. RESULTS Northern blot analysis revealed that LPS treatment significantly decreased the expression of mRNA for PepT1 (32-62% of controls) at different time points. In the LPS + dexamethasone group, it was 66-95% of controls. The protein level of PepT1 in the jejunum was consistent with the mRNA expression level. Immunohistochemistry also showed a reduction of PepT1 immunoreactivity in the LPS group. LPS treatment resulted in increased tumor necrosis factor alpha and interleukin 1 beta levels, but dexamethasone treatment profoundly counteracted the cytokine production. CONCLUSIONS This is the first report that LPS treatment reduces PepT1 expression in the rat small intestine. Short-term treatment with dexamethasone attenuated the effects of LPS by decreasing the cytokine levels.

UI MeSH Term Description Entries
D007421 Intestine, Small The portion of the GASTROINTESTINAL TRACT between the PYLORUS of the STOMACH and the ILEOCECAL VALVE of the LARGE INTESTINE. It is divisible into three portions: the DUODENUM, the JEJUNUM, and the ILEUM. Small Intestine,Intestines, Small,Small Intestines
D008070 Lipopolysaccharides Lipid-containing polysaccharides which are endotoxins and important group-specific antigens. They are often derived from the cell wall of gram-negative bacteria and induce immunoglobulin secretion. The lipopolysaccharide molecule consists of three parts: LIPID A, core polysaccharide, and O-specific chains (O ANTIGENS). When derived from Escherichia coli, lipopolysaccharides serve as polyclonal B-cell mitogens commonly used in laboratory immunology. (From Dorland, 28th ed) Lipopolysaccharide,Lipoglycans
D008297 Male Males
D002352 Carrier Proteins Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes. Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D003907 Dexamethasone An anti-inflammatory 9-fluoro-glucocorticoid. Hexadecadrol,Decaject,Decaject-L.A.,Decameth,Decaspray,Dexasone,Dexpak,Hexadrol,Maxidex,Methylfluorprednisolone,Millicorten,Oradexon,Decaject L.A.
D004151 Dipeptides Peptides composed of two amino acid units. Dipeptide
D000074011 Peptide Transporter 1 A proton-coupled symporter that transports OLIGOPEPTIDES and DIPEPTIDES. It localizes to the brush-border membrane of the INTESTINAL EPITHELIUM and plays a critical role in the assimilation of dietary proteins. Hydrogen-Peptide Cotransporter PepT1,Intestinal H+-Peptide Cotransporter,PepT1 Protein,Pept-1 Transporter,SLC15A1 Protein,Solute Carrier Family 15 Member 1,hPEPT1 (Cotransporter),H+-Peptide Cotransporter, Intestinal,Hydrogen Peptide Cotransporter PepT1,Intestinal H+ Peptide Cotransporter,PepT1, Hydrogen-Peptide Cotransporter,Pept 1 Transporter,Transporter, Pept-1
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012333 RNA, Messenger RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm. Messenger RNA,Messenger RNA, Polyadenylated,Poly(A) Tail,Poly(A)+ RNA,Poly(A)+ mRNA,RNA, Messenger, Polyadenylated,RNA, Polyadenylated,mRNA,mRNA, Non-Polyadenylated,mRNA, Polyadenylated,Non-Polyadenylated mRNA,Poly(A) RNA,Polyadenylated mRNA,Non Polyadenylated mRNA,Polyadenylated Messenger RNA,Polyadenylated RNA,RNA, Polyadenylated Messenger,mRNA, Non Polyadenylated
D015152 Blotting, Northern Detection of RNA that has been electrophoretically separated and immobilized by blotting on nitrocellulose or other type of paper or nylon membrane followed by hybridization with labeled NUCLEIC ACID PROBES. Northern Blotting,Blot, Northern,Northern Blot,Blots, Northern,Blottings, Northern,Northern Blots,Northern Blottings

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