The specific aims of this research proposal are to investigate the nature of the age-related susceptibility of the newborn and developing human infant to infection with clinically relevant bacterial pathogens. This will be accomplished by the examination of several parameters of phagocytic cell system in the normal infant. This project is based upon the hypothesis that due to maturational deficiencies in the phagocytic cell system, i.e., phagocytic cells, neutrophils (PMNs) and monocytes-macrophages (MONO), and nonspecific opsonins, i.e., fibronectin and complement components, the neonatal and young infant is at increased risk to certain severe bacterial infections. Parallel investigations will be conducted in ongoing experimental rat model systems in which maturational changes in the phagocytic cell response to challenge infection can be systematically and rigorously examined and compared with those of the human. Micro-assay procedures developed will be employed in longitudinal studies of a number of functional and biochemical cellular characteristics of both peripheral blood PMN obtained by heel stick from infants during their first week of life. In addition, the role of fibronectin in bacterial tissue adherence will be studied. Attempts will be made to correlate changes in the nonspecific phagocytic cell system with changes in susceptibility to bacteria associated with neonatal sepsis. We anticipate that through the combined approach of longitudinal studies of the human neonate and the animal model systems, it should be possible to delineate deficiencies in the immune system of the developing infant important in diagnosis and treatment. Moreover, these studies should not only provide suitable predictive markers for the identification of human infants at risk but may also form basis for developing new intervention strategies important in therapy of life threatening infections in the newborn.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Specialized Center (P50)
Project #
5P50AI026821-03
Application #
3810295
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
3
Fiscal Year
1990
Total Cost
Indirect Cost
Name
Georgetown University
Department
Type
DUNS #
049515844
City
Washington
State
DC
Country
United States
Zip Code
20057
Gowda, D C; Glushka, J; Halbeek Hv et al. (2001) N-linked oligosaccharides of cobra venom factor contain novel alpha(1-3)galactosylated Le(x) structures. Glycobiology 11:195-208
Vogel, C W; Bredehorst, R; Fritzinger, D C et al. (1996) Structure and function of cobra venom factor, the complement-activating protein in cobra venom. Adv Exp Med Biol 391:97-114
Cohn, M L; Robinson, E D; Thomas, D et al. (1996) T cell responses to the paramyxovirus simian virus 5: studies in multiple sclerosis and normal populations. Pathobiology 64:131-5
Gowda, D C; Petrella, E C; Raj, T T et al. (1994) Immunoreactivity and function of oligosaccharides in cobra venom factor. J Immunol 152:2977-86
Cohn, M L; Robinson, E D; Faerber, M et al. (1994) Measles vaccine failures: lack of sustained measles-specific immunoglobulin G responses in revaccinated adolescents and young adults. Pediatr Infect Dis J 13:34-8
Fritzinger, D C; Bredehorst, R; Vogel, C W (1994) Molecular cloning and derived primary structure of cobra venom factor. Proc Natl Acad Sci U S A 91:12775-9
Fritzinger, D C; Petrella, E C; Connelly, M B et al. (1992) Primary structure of cobra complement component C3. J Immunol 149:3554-62
Gowda, D C; Schultz, M; Bredehorst, R et al. (1992) Structure of the major oligosaccharide of cobra venom factor. Mol Immunol 29:335-42