One of the factors present in saliva which has been shown to inhibit HIV infection in vitro is secretory leukocyte protease inhibitor (SLPI). This application is a proposal for an R01 award to extend the work of the PI on the inhibition of HIV by SLPI. The overall objective is to determine the molecular mechanism through which SLPI blocks virus infectivity. Since all of the studies to date have utilized laboratory strains of HIV, the first specific aim is designed to determine if SLPI also inhibits primary clinical isolates of HIV-1 which are thought to be more representative of the strains found in infected individuals. Isolates that are found to be resistant to SLPI will be further characterized by generating recombinant chimeras in order to identify the region(s) of virus responsible for the resistant phenotype.
In specific aim 2, the investigator will generate SLPI-based recombinant proteins using alanine scanning, deletion and site-directed mutagenesis. The mutants will be used to test the hypothesis that charged amino acid residues on the exterior of the SLPI molecule are responsible for inhibition of HIV.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Research Project (R01)
Project #
5R01DE012162-04
Application #
2897140
Study Section
Special Emphasis Panel (ZDE1-YS (31))
Project Start
1996-09-30
Project End
2001-07-31
Budget Start
1999-08-01
Budget End
2000-07-31
Support Year
4
Fiscal Year
1999
Total Cost
Indirect Cost
Name
University of North Carolina Chapel Hill
Department
Dentistry
Type
Schools of Dentistry
DUNS #
078861598
City
Chapel Hill
State
NC
Country
United States
Zip Code
27599
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Gray, Laurie R; Alexander, Audrey L; Shugars, Diane C (2002) Construction, non-denaturing affinity purification, and characterization of baculovirally expressed human secretory leukocyte protease inhibitor. Protein Expr Purif 26:179-86
Freel, S A; Williams, J M; Nelson, J A et al. (2001) Characterization of human immunodeficiency virus type 1 in saliva and blood plasma by V3-specific heteroduplex tracking assay and genotype analyses. J Virol 75:4936-40
Shugars, D C; Slade, G D; Patton, L L et al. (2000) Oral and systemic factors associated with increased levels of human immunodeficiency virus type 1 RNA in saliva. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 89:432-40
Shugars, D C; Wahl, S M (1998) The role of the oral environment in HIV-1 transmission. J Am Dent Assoc 129:851-8
McNeely, T B; Shugars, D C; Rosendahl, M et al. (1997) Inhibition of human immunodeficiency virus type 1 infectivity by secretory leukocyte protease inhibitor occurs prior to viral reverse transcription. Blood 90:1141-9