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Related post: DEPARTMENT OF HEALTH AND HUMAN SERVICES - PUBUC HEALTH SERVICE NOTICE OF INTRAMURAL RESEARCH PROJECT PROJECT NUMBER ZOl AI 00632-01 LMSF PERIOD COVERED October 1, 1991, to September 30, 1992 TITLE OF PROJECT (80 characters or lass. TitiB must fit on one Imuran Online line between the borders.) Siderophores and Iron Transport in Pseudomona aeruginosa PRINCIPAL INVESTIGATOR (List other professional personnel below the Principal Investigator.) (Name, Purchase Imuran Online title, laboratory, and institute affiliation) P.I.: R. G. Ankenbauer IRTA NIAID, NIH COOPERATING UNITS (if any) C. White, stay in Order Imuran School Program LAB/BRANCH Laboratory of Microbial Structure and Function INSTITUTE AND LOCATION NIAID, NIH, Bethesda, Buy Voveran Sr MD 20892 TOTAL STAFF YEARS: PROFESSIONAL CHECK APPROPRIATE BOX(ES) □ (a) Human subjects D (a1) Minors D (a2) Interviews n (b) Human tissues B (c) Neither SUMMARY OF WORK (Use standard unreduced type. Do not exceed the space provided.) The tremsport of Fe(III) -pyochelin by Pseudomonas aeruginosa has been investigated The receptor for Fe (III) Buy Cheap Imuran -pyochelin has been determined to be a -75 kDa outer membrane protein. Mutants lacking this outer membrane protein have an absolute defect in the transport of Fe( III) -pyochelin. This finding refutes the previous designation of a 14 kDa outer membrane protein as the receptor for Fe(III)- pyochelin. Work on pyochelin analogues has resulted in the discovery of a novel artificial siderophore and iron transport Buy Imuran system in P. aeruginosa . Although this artificial siderophore, trivially designated HTC, has structural similarities to pyochelin, its transport is independent of the Fe( III) -pyochelin receptor. Pfta 6040 (Hav. 5^92) 16-11 DEPARTMENT OF HEALTH AND HUMAN SERVICES - PUBUC HEALTH SERVICE NOTICE OF INTRAMURAL RESEARCH PROJECT PROJECT NUMBER ZOl AI 00633-01 LMSF PERIOD COVERED October 1, 1991, to September 30, 1992 TITLE OF PROJECT (80 characters or less. Title must lit on one line tietween the borders.) Neisserial-Host Interaction: Pathogenic Mechanisms and Host Responses PRINCIPAL INVESTIGATOR (List other pralassional personnel below the Principal Investigator.) (Name, title, laboratory, and institute affiliation) PI: S. H. Fischer Research Associate LMSF, NIAID COOPERATING UNITS (if any) M. Konkel, LVP, RML, NIAID LAB/BRANCH Laboratory of Microbial Structure and Function, Hamilton, MT 59840 INSTITUTE AND LOCATION NIAID, NIH, Generic Imuran Bethesda, MD 20892 TOTAL STAFF YEARS: PROFESSIONAL CHECK APPROPRIATE BOX(ES) D (a) Human subjects D (b) Human tissues D (a1) Minors D (a2) interviews El (c) Neither SUMMARY OF WORK (Use standard unreduced type. Do not exceed the space provided.) Neisseria gonorrhoeae interactions with hviman polymorphonuclear neutrophils and host proteins were studied in order to understand how the expression of different gonococcal surface components affects bacterial association with host cells and cell surface proteins. Studies were carried out to characterize A) gonococcal interactions with human extracellular matrix proteins and B) the role of fourth oligopeptide loop of gonococcal opacity proteins in mediating neutrophil (PMN) responses to gonococci. A. Attachment of gonococci to extracellular matrix Voveran Sr 100 proteins: Gonococcal with or without opacity (Opa) proteins were tested for adherence to plastic coverslips coated with human laminin, vitronectin, fibronectin (FN) , collagen type IV or bovine serum albumin (BSA) . Neither Opa+ nor Opa- variants showed increased adherence BSA compared to the plastic coverslips alone. Opa+ variants, but not Opa-, adhered significantly more to FN than to BSA. Gonococci expressing Opa A showed 1.8X, 3 . 8X and 11. 2X times greater adherence to laminin, vitronectin and FN, respectively, than to BSA but no increased adherence to collagen type IV. Rabbit anti-human Buy Imuran Online FN antiserum inhibited Opa A attachment to FN Order Imuran Online by 50% while normal rabbit serum had no effect. Interestingly, PMN responses to Opa+ gonococci Purchase Imuran were inhibited in a dose-dependent manner by added FN. B. Role of the gonococcal opacity protein fourth loop in mediating human neutrophil responses to gonococci: A peptide representing the conserved surface-exposed Opa protein fourth loop inhibited neutrophil Voveran Sr 75 responses to gonococci in suspension and when coated on surfaces directly stimulated neutrophil responses; a control peptide with a scrambled sequence did neither. Rabbit antisera against the fourth loop peptide was opsonic for Opa+ gonococci and affinity-purified anti-fourth loop IgG inhibited PMN non-opsonic responses to gonococci. This suggests a role for the fourth oligopeptide loop in neutrophil interactions. 16-12 PNS 6040 (Hev. IIK.) ' LABORATORY OF PARASITIC DISEASES 1992 Annual Report Table of Contents ZOl AI Project Number Page
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