Urocortin and corticotropin-releasing factor receptor expression in the human colonic mucosa
| Autor: | Mitsuko Ito, Takashi Suzuki, Gen Hirasawa, Junji Takeyama, Hironobu Sasano, Michio Hongo, Yasunari Muramatsu, Hiroshi Nagura, Kazuhito Totsune, Kazuhiro Takahashi, Kouhei Fukushima, Masato Nose, Atsushi Tashiro, Kazumi Iino, Yutaka Oki |
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| Předmět: |
Adult
endocrine system medicine.medical_specialty Colon Corticotropin-Releasing Hormone Physiology Receptor expression Antigens Differentiation Myelomonocytic Neuropeptide In situ hybridization Biology Receptors Corticotropin-Releasing Hormone Biochemistry Cellular and Molecular Neuroscience Fetus Endocrinology Antigens CD Internal medicine medicine Humans Protein Isoforms Tissue Distribution RNA Messenger Child Autocrine signalling Receptor Lung In Situ Hybridization Urocortins Urocortin Lamina propria Mucous Membrane Reverse Transcriptase Polymerase Chain Reaction Ovary Age Factors Infant Newborn Infant Epithelial Cells Flow Cytometry Immunohistochemistry medicine.anatomical_structure Liver Child Preschool Linear Models Female Spleen hormones hormone substitutes and hormone antagonists |
| Zdroj: | Scopus-Elsevier |
| Popis: | Urocortin is a newly identified member of the CRF neuropeptide family. Urocortin has been found to bind with high affinity to CRF receptors. The present study investigated urocortin and CRF receptor expression in human colonic mucosa. Non-pathologic sections of adult colorectal tissues were obtained from patients with colorectal cancer at surgery. Urocortin expression was examined using immunohistochemistry and messenger (m) RNA in situ hybridization. Isolated lamina propria mononuclear cells (LPMC) and epithelial cells were also analyzed by flow cytometry for the characterization of urocortin-positive cells, and by RT-PCR for detection of urocortin, CRF, and CRF receptor mRNA. Urocortin peptide distribution at various stages of human development (n = 35, from 11 weeks of gestation to 6 years of age) was examined by immunohistochemistry using surgical and autopsy specimens. Immunoreactive urocortin and urocortin mRNA were predominantly detected in lamina propria macrophages. Urocortin peptide expression was detected from as early as three months of age, but not before birth or in neonates. Urocortin, CRF receptor type 1 and type 2 alpha mRNA were detected in LPMC. CRF receptor type 2 beta mRNA, a minor isoform in human tissues, was also detected in LPMC, but at lower levels. Urocortin is locally synthesized in lamina propria macrophages and may act on lamina propria inflammatory cells as an autocrine/paracrine regulator of the mucosal immune system. The appearance of urocortin after birth indicates that the exposure to dietary intake and/or luminal bacteria after birth may contribute to the initiation of urocortin expression in human gastrointestinal tract mucosa. |
| Databáze: | OpenAIRE |
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