Inflammation is a complex host response that involves several biochemical pathways and all hemopoietic elements. T lymphocytes play an integral role in inflammatory responses by secreting soluble protein factors, lymphokines, that can regulate both the immunospecific and generalized aspects of the response. The first cells to arrive at a site of inflammation are neutrophilic granulocytes; macrophages usually appear several hours after granulocytes. Cloned T lymphocytes are a potent source of factors that affect hemopoiesis. The major hemopoietically active factor that is secreted by T lymphocytes is a granulocyte-macrophage colony-stimulating factor (GM-CSF). During an inflammatory response this GM-CSF may act distally on bone marrow cells to increase the number of responding granulocytes and macrophages. A major goal of this project is to purify to homogeneity the T lymphocyte GM-CSF. A highly enriched preparation of GM-CSF has been obtained with the use of high-pressure liquid chromatography. When serum free T lymphocyte-conditioned medium is used as a starting material, the GM-CSF will be purified to homogeneity. Another aim of this project is to determine the nature of the interaction between GM-CSF, IL3 (which is also produced by T lymphocytes), and erythropoietin. It has been shown already tha IL3 potentiates the effects of erythropoietin. However, T lymphocytes secrete about 10-100-fold more GM-CSF than IL3; the molecular basis for the net effect on bone marrow cells when all three factors are present in physiological or pathophysiological (i.e. during inflammation) concentrations is unknown but testable with pure factors. In addition, homogeneous GM-CSF will be subjected to mild proteolysis in an attempt to produce biologically active peptides to determine the minimal structural requirements that are necessary for biological activity. A longterm goal of this project will be to synthesize chemically bioactive peptides and structural analogs that can be used as either stimulatory or inhibitory effectors of hemopoiesis. These studies will further our understanding of the role that T lymphocytes play in regulating hemopoiesis.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA048648-08
Application #
3192550
Study Section
Hematology Subcommittee 2 (HEM)
Project Start
1988-04-01
Project End
1993-03-31
Budget Start
1992-04-01
Budget End
1993-03-31
Support Year
8
Fiscal Year
1992
Total Cost
Indirect Cost
Name
University of Pennsylvania
Department
Type
Schools of Medicine
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
Orlofsky, A; Lin, E Y; Prystowsky, M B (1994) Selective induction of the beta chemokine C10 by IL-4 in mouse macrophages. J Immunol 152:5084-91
Lin, E Y; Orlofsky, A; Berger, M S et al. (1993) Characterization of A1, a novel hemopoietic-specific early-response gene with sequence similarity to bcl-2. J Immunol 151:1979-88
Berger, M S; Kozak, C A; Gabriel, A et al. (1993) The gene for C10, a member of the beta-chemokine family, is located on mouse chromosome 11 and contains a novel second exon not found in other chemokines. DNA Cell Biol 12:839-47
Altmann, S W; Prystowsky, M B (1992) Evaluation of human N-linked glycosylation sites in murine granulocyte-macrophage colony-stimulating factor. Arch Biochem Biophys 293:349-55
Meropol, N J; Altmann, S W; Shanafelt, A B et al. (1992) Requirement of hydrophilic amino-terminal residues for granulocyte-macrophage colony-stimulating factor bioactivity and receptor binding. J Biol Chem 267:14266-9
Meropol, N J; Kreider, B L; Lee, V M et al. (1991) A neutralizing monoclonal antibody binds to an epitope near the amino terminus of murine granulocyte-macrophage colony-stimulating factor. Hybridoma 10:433-47
Altmann, S W; Johnson, G D; Prystowsky, M B (1991) Single proline substitutions in predicted alpha-helices of murine granulocyte-macrophage colony-stimulating factor result in a loss in bioactivity and altered glycosylation. J Biol Chem 266:5333-41
Moscinski, L C; Nowell, P C; Hoxie, J A et al. (1991) Surface marker analysis and karyotype distinguish acute biphenotypic leukemia from acute myelogenous leukemia expressing terminal deoxynucleotidyl transferase. Cancer 68:2161-8
Orlofsky, A; Berger, M S; Prystowsky, M B (1991) Novel expression pattern of a new member of the MIP-1 family of cytokine-like genes. Cell Regul 2:403-12
Moscinski, L C; Prystowsky, M B (1990) Identification of a series of differentiation-associated gene sequences from GM-CSF stimulated bone marrow. Oncogene 5:31-7

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