PMID- 10886398 OWN - NLM STAT- MEDLINE DCOM- 20000718 LR - 20230412 IS - 0019-2805 (Print) IS - 1365-2567 (Electronic) IS - 0019-2805 (Linking) VI - 100 IP - 2 DP - 2000 Jun TI - Levamisole induces interleukin-18 and shifts type 1/type 2 cytokine balance. PG - 217-24 AB - Immune responses can be classified, according to the predominant cytokines involved, into type 1 (featuring interferon-gamma, IFN-gamma) and type 2 (featuring interleukin-4, IL-4); imbalance between type 1 and type 2 cytokine compartments has been implicated in many human diseases. Levamisole is a drug with an unknown mode of action that has been used to boost immunity in infectious diseases including leprosy, and in some cancers. To test the hypothesis that levamisole acts by inducing a shift to a type 1 immune response, we used Brown Norway (BN) rats, which are markedly biased to type 2 responses. BN rats treated with levamisole showed a dose-dependent rise in serum IFN-gamma and fall in serum immunoglobulin E (IgE) level. Detailed analysis of cytokine gene expression showed upregulation of IFN-gamma and downregulation of IL-4 messenger RNA. This coincided with marked upregulation of IL-18, a recently characterized cytokine with potent activity in stimulating IFN-gamma production. IL-12 was not induced. Further, the type 2 response induced in BN rats by mercuric chloride was markedly attenuated when rats were pretreated with levamisole: there was a 2-log reduction in maximum serum IgE level and marked attenuation of IL-4 gene upregulation. These data indicate that levamisole acts by resetting the immune balance towards a type 1 response via induction of IL-18. Our findings provide a direction for development of more specific immunomodulating therapy. FAU - Szeto, C AU - Szeto C AD - Academic Renal Unit, University of Bristol, Southmead Hospital, Bristol, UK. FAU - Gillespie, K M AU - Gillespie KM FAU - Mathieson, P W AU - Mathieson PW LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Immunology JT - Immunology JID - 0374672 RN - 0 (Adjuvants, Immunologic) RN - 0 (Antinematodal Agents) RN - 0 (Interleukin-18) RN - 207137-56-2 (Interleukin-4) RN - 2880D3468G (Levamisole) RN - 37341-29-0 (Immunoglobulin E) RN - 53GH7MZT1R (Mercuric Chloride) RN - 82115-62-6 (Interferon-gamma) SB - IM MH - Adjuvants, Immunologic/*pharmacology MH - Animals MH - Antinematodal Agents/*pharmacology MH - Dose-Response Relationship, Immunologic MH - Female MH - Gene Expression Regulation/drug effects MH - Immunoglobulin E/blood MH - Interferon-gamma/blood/genetics MH - Interleukin-18/genetics/*metabolism MH - Interleukin-4/genetics/metabolism MH - Levamisole/*pharmacology MH - Male MH - Mercuric Chloride/antagonists & inhibitors MH - Rats MH - Rats, Inbred BN MH - Th2 Cells/drug effects/immunology PMC - PMC2327010 EDAT- 2000/07/11 11:00 MHDA- 2000/07/25 11:00 PMCR- 2001/06/01 CRDT- 2000/07/11 11:00 PHST- 2000/07/11 11:00 [pubmed] PHST- 2000/07/25 11:00 [medline] PHST- 2000/07/11 11:00 [entrez] PHST- 2001/06/01 00:00 [pmc-release] AID - imm042 [pii] AID - 10.1046/j.1365-2567.2000.00042.x [doi] PST - ppublish SO - Immunology. 2000 Jun;100(2):217-24. doi: 10.1046/j.1365-2567.2000.00042.x.