Accession Number : ADA182487

Title :   Cercarial Penetration Studies. Steps toward Chemoprophylaxis in Schistosomiasis.

Descriptive Note : Annual rept. 15 Aug 85-14 Aug 86,

Corporate Author : ILLINOIS UNIV COLL OF MEDICINE AT ROCKFORD

Personal Author(s) : Salafsky,B ; Fusco,A C

PDF Url : ADA182487

Report Date : 15 Oct 1986

Pagination or Media Count : 18

Abstract : The scope of this research centers on elucidating the biochemical mechanisms involved in cercarial (Schistosoma mansoni) skin penetration and the evaluation of eicosanoid inhibitors as possible prophylactic agents. The most significant findings to date are: 1) Cercarial eicosanoid production is pH dependent. 2) Esculetin was effective in vitro at inhibiting cercarial penetration of an agar: gelatin substrate. However, the drug was not effective in vivo, probably due to its short serum half-life. 3) We have tentatively indentified cercarial LTB4 (or metabolites) production as a correlate of cercarial penetration. 4) After examining various in vitro methods used to transform cercariae into schistosomules, we could find no significant correlations between ultrastructural and loss of water tolerance or eicosanoid production. This is particularly significant since ultrastructural changes have been the predominate method used to evaluate transformation methods. 5) Cercariae more readily penetrate the skin of SENCAR mice, a strain with reportly high skin lipoxygenase products, than they do the skin of either ICR or NMRI strains. This provides indirect evidence of the importance of lipoxygenase products in cercarial penetration. Keywords: Lipoxygenase, Cyclo-oxygenase, Linoleate, Chemoprophylaxis, Esculetin, Ibuprofen, Ketoconazole, Caffeic acid.

Descriptors :   *ANTISCHISTOSOMAL DRUGS, *CERCARIAE, *PREVENTIVE MEDICINE, *SCHISTOSOMA MANSONI, IN VITRO ANALYSIS, IN VIVO ANALYSIS, METABOLITES, MICE, PENETRATION, AGAR, BIOCHEMISTRY, PRODUCTION, SCHISTOSOMIASIS, SUBSTRATES, TOLERANCE, WATER, CHEMISTRY, GELATINS, OXIDOREDUCTASES, SKIN(ANATOMY)

Subject Categories : Medicine and Medical Research
      Pharmacology
      Biochemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE