The long-term objective of the proposed research is to develop new therapeutic regimens which may be employed effectively either alone or in combination with other drugs for treatment of the acquired immunodeficiency syndrome (AIDS). To achieve this goal, the Principal Investigator has established a multi- disciplinary effort to synthesize novel prodrugs of 2',3'- dideoxynucleosides (DDN's). In the proposed research, he and his associates will design new analogs to attain higher intracellular drug concentrations, to decrease bone marrow toxicity, and to overcome limited permeability through the blood brain barrier. They will synthesize, specifically, sterically-hindered esters of DDN's in an attempt to increase the plasma half-life and permeability into the central nervous system (CNS) and hexadecyl esters linked at the phosphate function of the glycerol phosphate esters of DDN's and of dimers such as AZT-P-U in order to enhance transmembrane transport properties. In a second major effort, the researchers will examine the effects of vitamin E and of growth factors (i.e., IL-3, GMSCF, and SCF) with respect to protection of bone marrow cells from AZT-induced inhibition of erythropoietin-receptor expression as well as of protein kinase C activity, determining such physicochemical parameters as partition coefficients and protein binding capacities of the newly synthesized agents. They will evaluate the intracellular uptake and antiviral action of prodrugs in vitro, employing cells infected with the human immunodeficiency virus (HIV), such as human peripheral blood lymphocytes (PBL's) and monocytes/ macrophages of lymphocytic and monocytic cell lines (H9 and MT4, and U937, respectively). Finally, in order to determine the extent and rate of entry of the various prodrugs into the cerebrospinal fluid (CSF) and brain tissue, the researchers will study the active agents developed by this program in mice and rabbits to evaluate pharmacokinetic parameters.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
2R01AI025909-07A2
Application #
2063165
Study Section
AIDS and Related Research Study Section 2 (ARRB)
Project Start
1987-09-30
Project End
1997-05-31
Budget Start
1994-06-01
Budget End
1995-05-31
Support Year
7
Fiscal Year
1994
Total Cost
Indirect Cost
Name
Tulane University
Department
Pharmacology
Type
Schools of Medicine
DUNS #
City
New Orleans
State
LA
Country
United States
Zip Code
70118
Jaspan, Heather B; Robinson, James E; Amedee, Angela Martin et al. (2004) Amniotic fluid has higher relative levels of lentivirus-specific antibodies than plasma and can contain neutralizing antibodies. J Clin Virol 31:190-7
Plymale, D R; Comardelle, A M; Fermi, C D et al. (1999) Concentration-dependent differential induction of necrosis or apoptosis by HIV-1 lytic peptide 1. Peptides 20:1275-83
Plymale, D R; Tang, D S; Comardelle, A M et al. (1999) Both necrosis and apoptosis contribute to HIV-1-induced killing of CD4 cells. AIDS 13:1827-39
Gatti, P J; Choi, B; Haislip, A M et al. (1998) Inhibition of HIV type 1 production by hygromycin B. AIDS Res Hum Retroviruses 14:885-92
Choi, B; Gatti, P J; Haislip, A M et al. (1998) Role of potassium in human immunodeficiency virus production and cytopathic effects. Virology 247:189-99
Comardelle, A M; Norris, C H; Plymale, D R et al. (1997) A synthetic peptide corresponding to the carboxy terminus of human immunodeficiency virus type 1 transmembrane glycoprotein induces alterations in the ionic permeability of Xenopus laevis oocytes. AIDS Res Hum Retroviruses 13:1525-32
Garry, R F; Fermin, C D; Kohler, P F et al. (1996) Antibodies against retroviral proteins and nuclear antigens in a subset of idiopathic CD4+ T lymphocytopenia patients. AIDS Res Hum Retroviruses 12:931-40
Gogu, S R; Agrawal, K C (1996) The protective role of zinc and N-acetylcysteine in modulating zidovudine induced hematopoietic toxicity. Life Sci 59:1323-9
Voss, T G; Gatti, P J; Fermin, C D et al. (1996) Reduction of human immunodeficiency virus production and cytopathic effects by inhibitors of the Na+/K+/2Cl- cotransporter. Virology 219:291-4
Ulug, E T; Garry, R F; Bose Jr, H R (1996) Inhibition of Na+K+ATPase activity in membranes of Sindbis virus-infected chick cells. Virology 216:299-308

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