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  • 1
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    Selective opioid inhibition of small nociceptive neurons (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-11-24
    Description: Opioid analgesia, the selective suppression of pain without effects on other sensations, also distinguishes between different types of pain: severe, persistent pain is potently inhibited by opioids, but they fail to cohceal the sensation of a pinprick. The cellular basis for this specificity was analyzed by means of patch-clamp experiments performed on fluorescently labeled nociceptive neurons (nociceptors) that innervate rat tooth pulp. Activation of the mu opioid receptor inhibited calcium channels on almost all small nociceptors but had minimal effect on large nociceptors. Somatostatin had the opposite specificity, preferentially inhibiting calcium channels on the large cells. Because persistent pain is mediated by slow-conducting, small nociceptors, opioids are thus likely to inhibit neurotransmitter release only at those primary synapses specialized for persistent pain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taddese, A -- Nah, S Y -- McCleskey, E W -- New York, N.Y. -- Science. 1995 Nov 24;270(5240):1366-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vollum Institute, Oregon Health Sciences University, Portland 97201, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7481826" target="_blank"〉PubMed〈/a〉
    Keywords: Analgesics/*pharmacology ; Animals ; Calcium Channels/drug effects ; Cells, Cultured ; Dental Pulp/innervation ; Enkephalin, Ala(2)-MePhe(4)-Gly(5)- ; Enkephalins/*pharmacology ; Male ; Neurons, Afferent/*drug effects/physiology ; Neurotransmitter Agents/metabolism ; Nociceptors/*drug effects/physiology ; Patch-Clamp Techniques ; Presynaptic Terminals/drug effects/metabolism ; Rats ; Rats, Sprague-Dawley ; Receptors, Opioid, mu/*physiology ; Receptors, Somatostatin/physiology ; Sodium Channel Blockers ; Somatostatin/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Patients with familial adenomatous polyposis harbor colonic biofilms containing tumorigenic bacteria (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-02-03
    Description: Individuals with sporadic colorectal cancer (CRC) frequently harbor abnormalities in the composition of the gut microbiome; however, the microbiota associated with precancerous lesions in hereditary CRC remains largely unknown. We studied colonic mucosa of patients with familial adenomatous polyposis (FAP), who develop benign precursor lesions (polyps) early in life. We identified patchy bacterial biofilms composed predominately of Escherichia coli and Bacteroides fragilis . Genes for colibactin ( clbB ) and Bacteroides fragilis toxin ( bft ), encoding secreted oncotoxins, were highly enriched in FAP patients’ colonic mucosa compared to healthy individuals. Tumor-prone mice cocolonized with E. coli (expressing colibactin), and enterotoxigenic B. fragilis showed increased interleukin-17 in the colon and DNA damage in colonic epithelium with faster tumor onset and greater mortality, compared to mice with either bacterial strain alone. These data suggest an unexpected link between early neoplasia of the colon and tumorigenic bacteria.
    Keywords: Medicine, Diseases, Microbiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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