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Unique Running Pattern and Mucosal Morphology Found in the Colon of Cotton Rats

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Title: Unique Running Pattern and Mucosal Morphology Found in the Colon of Cotton Rats
Authors: Chuluunbaatar, Tsolmon Browse this author
Ichii, Osamu Browse this author →KAKEN DB
Nakamura, Teppei Browse this author →KAKEN DB
Irie, Takao Browse this author
Namba, Takashi Browse this author
Islam, Md Rashedul Browse this author
Otani, Yuki Browse this author
Masum, Md Abdul Browse this author
Okamatsu-Ogura, Yuko Browse this author
Elewa, Yaser Hosny Ali Browse this author
Kon, Yasuhiro Browse this author →KAKEN DB
Keywords: cotton rat
large intestine
longitudinal fold
sex difference
Issue Date: 26-Oct-2020
Publisher: Frontiers Media
Journal Title: Frontiers in physiology
Volume: 11
Start Page: 587214
Publisher DOI: 10.3389/fphys.2020.587214
Abstract: Cotton rats are one of the experimental rodents used for testing different infectious and non-infectious diseases, including gastrointestinal tract pathology. However, their intestinal morphological characteristics are still poorly understood. Here, we clarified the anatomical and histological characteristics of the cecum and ascending colon (AC) of young (1-3-month old), adult (4-6-month old), and old (10-12-month old) cotton rats. The large intestine (LI) in cotton rats is composed of the cecum, AC, transverse and descending colons, and rectum, and is similar to that of other mammals. The AC begins with a double or triple spiral loop-like flexure (SLLF) and ends with a coupled horseshoe-like flexure (HSLF). A single longitudinal mucosal fold (SLMF) was found at the beginning of the AC along the mesentery line and developed with age. Furthermore, the SLMF contained several lymphatic nodules (LNs), indicating their role in digestive and immunological functions. Small and large protuberant LNs were found in the cecum and SLLF, respectively, whereas thin and flat LNs were observed in the HSLF and transverse colon, respectively. Regarding sex-related differences, adult females had a significantly longer AC with a higher number of SLLFs compared to males. The SLMF length and LN number were also longer and higher, respectively, in adult females compared to adult males. These are crucial findings, indicating the presence of sex-related differences in the morphology of the LI in cotton rats, and ours is the first study to discover a sex difference in the mammalian LI lining. Our study clarified the unique morphology of the LI in cotton rats, which could serve as the principal model for elucidating species-specific digestive tract functions and gastrointestinal disorders.
Type: article
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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