A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized Rats
A pain model for screening analgesics was established in anesthetized rats. The omenta of urethane-anesthetized rats were exteriorized, fixed in a plastic chamber, and superfused with Tyrode solution. Administration of bradykinin (BK) in the chamber elicited the reflex hypertensive response (RHR). M...
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| Format: | Article |
| Language: | English |
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Elsevier
2008-01-01
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| Series: | Journal of Pharmacological Sciences |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1347861319315191 |
| _version_ | 1819129495893835776 |
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| author | Shi-Jie Yang Makoto Katori Masataka Majima |
| author_facet | Shi-Jie Yang Makoto Katori Masataka Majima |
| author_sort | Shi-Jie Yang |
| collection | DOAJ |
| description | A pain model for screening analgesics was established in anesthetized rats. The omenta of urethane-anesthetized rats were exteriorized, fixed in a plastic chamber, and superfused with Tyrode solution. Administration of bradykinin (BK) in the chamber elicited the reflex hypertensive response (RHR). Modification of the RHR was tested by topical (in the chamber) or intravenous administration of drugs. The BK dose-response curve was shifted to the right by topical indomethacin. The RHR by BK was inhibited by topical application of a BK B2antagonist, (Thi5,8-D-Phe7-BK), a local anesthetic (2% carbocaine), and by intravenous administration of a ganglion blocker (hexamethonium) or an α-adrenergic blocker (dibenamine). The RHR by topical BK was almost completely inhibited by morphine and the suppression was largely reversed by naloxone. The RHR, induced by a threshold dose of BK and inhibited by indomethacin, was potentiated by pretreatment of the omentum with prostaglandin (PG) E2or PGI2. PGE2was less potent, but the effect lasted longer than that of PGI2. Topical administration of a non-acidic analgesic, mepirizole, inhibited the RHR by topical BK by only 20%, but intravenous mepirizole inhibited topical BK by 96.2%, indicating its major central action. This model may be useful for studying analgesics. Keywords:: omentum, bradykinin B2–receptor antagonist, morphine, prostaglandin, mepirizole |
| first_indexed | 2024-12-22T08:44:38Z |
| format | Article |
| id | doaj.art-3313323e4c9349dcaddbd95692d6daae |
| institution | Directory Open Access Journal |
| issn | 1347-8613 |
| language | English |
| last_indexed | 2024-12-22T08:44:38Z |
| publishDate | 2008-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Pharmacological Sciences |
| spelling | doaj.art-3313323e4c9349dcaddbd95692d6daae2022-12-21T18:32:09ZengElsevierJournal of Pharmacological Sciences1347-86132008-01-011062249256A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized RatsShi-Jie Yang0Makoto Katori1Masataka Majima2Department of Pharmacology, Kitasato University School of Medicine, Sagamihara, Kanagawa 228-8555, Japan; Present address: Department of Pharmacology, School of Basic Medical Sciences, Jilin University, 2, Xinmin St. Changchun, Jilin, China 13002Department of Pharmacology, Kitasato University School of Medicine, Sagamihara, Kanagawa 228-8555, Japan; Corresponding author. hy3m-ktr@asahi-net.or.jpDepartment of Pharmacology, Kitasato University School of Medicine, Sagamihara, Kanagawa 228-8555, JapanA pain model for screening analgesics was established in anesthetized rats. The omenta of urethane-anesthetized rats were exteriorized, fixed in a plastic chamber, and superfused with Tyrode solution. Administration of bradykinin (BK) in the chamber elicited the reflex hypertensive response (RHR). Modification of the RHR was tested by topical (in the chamber) or intravenous administration of drugs. The BK dose-response curve was shifted to the right by topical indomethacin. The RHR by BK was inhibited by topical application of a BK B2antagonist, (Thi5,8-D-Phe7-BK), a local anesthetic (2% carbocaine), and by intravenous administration of a ganglion blocker (hexamethonium) or an α-adrenergic blocker (dibenamine). The RHR by topical BK was almost completely inhibited by morphine and the suppression was largely reversed by naloxone. The RHR, induced by a threshold dose of BK and inhibited by indomethacin, was potentiated by pretreatment of the omentum with prostaglandin (PG) E2or PGI2. PGE2was less potent, but the effect lasted longer than that of PGI2. Topical administration of a non-acidic analgesic, mepirizole, inhibited the RHR by topical BK by only 20%, but intravenous mepirizole inhibited topical BK by 96.2%, indicating its major central action. This model may be useful for studying analgesics. Keywords:: omentum, bradykinin B2–receptor antagonist, morphine, prostaglandin, mepirizolehttp://www.sciencedirect.com/science/article/pii/S1347861319315191 |
| spellingShingle | Shi-Jie Yang Makoto Katori Masataka Majima A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized Rats Journal of Pharmacological Sciences |
| title | A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized Rats |
| title_full | A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized Rats |
| title_fullStr | A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized Rats |
| title_full_unstemmed | A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized Rats |
| title_short | A Novel Model of Pain Sensation Using Superfused Gastrosplenic Omentum Preparation of Anesthetized Rats |
| title_sort | novel model of pain sensation using superfused gastrosplenic omentum preparation of anesthetized rats |
| url | http://www.sciencedirect.com/science/article/pii/S1347861319315191 |
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