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The antiserum was specific for AMPC and ampicillin (ABPC) but cross-reacted weakly with cephalexin. This enabled us to develop an immunocytochemical (ICC) method for detecting the uptake of AMPC in the rat intestine, liver, and kidney. Three hours after a single oral administration of AMPC, the ICC method revealed that AMPC distributed to a high degree in the microvilli, nuclei, and cytoplasm of the absorptive epithelial cells of the intestine. AMPC distributed in the cytoplasm and nuclei of the hepatocytes in a characteristic granular morphology on the bile capillaries, and in addition, AMPC adsorption was observed on the luminal surface of the capillaries, intercalated portions, and interlobular bile ducts on the bile flow. Almost no AMPC could be detected 6 h postadministration in either the intestine or the liver. Meanwhile, in the kidney, AMPC persisted until 12 h postadministration to a high degree in the proximal tubules, especially in the S3 segment cells in the tubular lumen, in which numerous small bodies that strongly reacted with the antibody were observed. All these sites of AMPC accumulation correspond well to specific sites where certain transporter systems for penicillins occur, suggesting that AMPC is actually and actively absorbed, eliminated, or excreted at these sites, possibly through such certain penicillin transporters.<\/jats:p>","DOI":"10.1128\/aac.01031-10","type":"journal-article","created":{"date-parts":[[2010,10,26]],"date-time":"2010-10-26T04:14:52Z","timestamp":1288066492000},"page":"62-71","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":18,"title":["Immunocytochemistry for Amoxicillin and Its Use for Studying Uptake of the Drug in the Intestine, Liver, and Kidney of Rats"],"prefix":"10.1128","volume":"55","author":[{"given":"Kunio","family":"Fujiwara","sequence":"first","affiliation":[{"name":"Department of Applied Life Science, Faculty of Biotechnology and Life Science, Sojo University, Ikeda 4-22-1, Kumamoto 860-0082, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masashi","family":"Shin","sequence":"additional","affiliation":[{"name":"Department of Applied Life Science, Faculty of Biotechnology and Life Science, Sojo University, Ikeda 4-22-1, Kumamoto 860-0082, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tsubasa","family":"Miyazaki","sequence":"additional","affiliation":[{"name":"Department of Applied Life Science, Faculty of Biotechnology and Life Science, Sojo University, Ikeda 4-22-1, Kumamoto 860-0082, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasuhiro","family":"Maruta","sequence":"additional","affiliation":[{"name":"Department of Applied Life Science, Faculty of Biotechnology and Life Science, Sojo University, Ikeda 4-22-1, Kumamoto 860-0082, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1152\/ajpgi.00056.2003"},{"key":"e_1_3_2_3_2","doi-asserted-by":"crossref","first-page":"847","DOI":"10.1016\/S0026-895X(24)23181-3","volume":"55","year":"1999","unstructured":"Apiwattanakul, N., T. 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