{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,11,10]],"date-time":"2023-11-10T21:40:15Z","timestamp":1699652415832},"reference-count":29,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2006,6,29]],"date-time":"2006-06-29T00:00:00Z","timestamp":1151539200000},"content-version":"vor","delay-in-days":9067,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scand J Immunol"],"published-print":{"date-parts":[[1981,9]]},"abstract":"<jats:p>The sera of ten Egyptian men with long\u2010standing lepromatous leprosy (LL) (mean duration 17.4 years) that had failed to respond in dapsone treatment were shown to inhibit mitogen stimulation responses of normal human lymphocytes. When first tested, the sera partly inhibited the response to phytohaemagglutinin (PHA) and pokeweed mitogen and virtually abolished that to concanavalin A (Con A): after repeated freezing and thawing, the Con A inhibition had disappeared, whereas the PHA response was still partly Inhibited. The inhibitory serum factor(s) had similar actions on lymphocytes from each of six normal donors. Although the sera varied in potency, they showed similar dose response curves when tested against lymphocytes from a single donor. The principal action of the sera was to reduce the number of cells responding to mitogen, without modifying the kinetics of recruitment or rate of volume growth during G<jats:sub>1<\/jats:sub>\u2010phase in those cells that were unaffected by the inhibitory substances(s). Study of PHA dose\u2010response curves and of the effect of delayed addition of LL serum suggested that the serum factor(s) act by diminishing the responsiveness of the cells, rather than by reducing the concentrations of free mitogen or by blocking cell membrane mitogen receptors The serum from one apparently healthy attendant, who had nursed leprosy patients for 30 years but who did not have leprosy or other chronic infective disease, inhibited completely stimulation by all three mitogens in a manner different from that of LL sera. Serum from the other 13 control patients did not modify the response of normal lymphocytes to stimulation by any of the three mitogens studied. It was concluded that the inhibitory factor(s) in the scrum of patients, with LL were a consequence of the disease and not of the environment in which the patients lived. Microscopy confirmed that the techniques used for recovery of the cultured cells did not introduce bias into the volume spectroscopy measurements.<\/jats:p>","DOI":"10.1111\/j.1365-3083.1981.tb00564.x","type":"journal-article","created":{"date-parts":[[2006,6,30]],"date-time":"2006-06-30T17:07:10Z","timestamp":1151687230000},"page":"269-280","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Serum Inhibitory Factor in Lepromatous Leprosy: Its Effect on the Pre\u2010S\u2010Phase Cell\u2010Cycle Kinetics of Mitogen\u2010stimulated Normal Human Lymphocytes"],"prefix":"10.1111","volume":"14","author":[{"given":"R. C.","family":"POTTS","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M. M.","family":"SHERIF","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A. 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