Decreased 5′nucleotidase activity in suppressor (OKT8) T lymphocytes from homosexuals with AIDS-related complex: Nonassociation with enhanced deoxynucleoside toxicity

James L. Murray, Daniel W. Bywaters, James M. Reuben, Peter W. Mansell, Evan M Hersh

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Abstract

The purine metabolic enzymes adenosine deaminase (ADA), purine nucleoside phosphorylase (PNP), and 5′nucleotidase (5NT) have been shown to be important for normal lymphocyte maturation. Abnormalities of these enzymes have been associated with hereditary as well as acquired immunodeficiency states. Enzyme activity was measured in helper (OKT4) and suppressor (OKT8) lymphocyte subsets from 10 homosexuals with AIDS-related complex (ARC) and in 10 healthy controls. There were no significant differences in either mean ADA activity or mean PNP activity between ARC OKT4 cells and control OKT4 cells and between ARC OKT8 cells and control OKT8 cells. By contrast, mean 5NT activity was slightly decreased in OKT4 cells from ARC patients compared with that of controls and more significantly diminished in ARC OKT8 cells compared with that of controls. Both deoxyadenosine and deoxyguanosine, when incubated separately with OKT4 and OKT8 cells in the presence of EHNA, and ADA inhibitor, did not significantly inhibit lymphocyte blastogenesis to a greater extent in ARC patients than in controls. Hence, the decreases in 5NT activity most likely reflect lymphocyte immaturity and are not associated with biochemical abnormalities leading to increased deoxynucleoside toxicity.

Original languageEnglish (US)
Pages (from-to)10-17
Number of pages8
JournalClinical Immunology and Immunopathology
Volume42
Issue number1
DOIs
StatePublished - 1987
Externally publishedYes

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AIDS-Related Complex
T-Lymphocytes
Purine-Nucleoside Phosphorylase
Adenosine Deaminase
Lymphocytes
Enzymes
Adenosine Deaminase Inhibitors
Deoxyguanosine
Lymphocyte Subsets
Lymphocyte Activation
Sexual Minorities

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy
  • Pathology and Forensic Medicine

Cite this

Decreased 5′nucleotidase activity in suppressor (OKT8) T lymphocytes from homosexuals with AIDS-related complex : Nonassociation with enhanced deoxynucleoside toxicity. / Murray, James L.; Bywaters, Daniel W.; Reuben, James M.; Mansell, Peter W.; Hersh, Evan M.

In: Clinical Immunology and Immunopathology, Vol. 42, No. 1, 1987, p. 10-17.

Research output: Contribution to journalArticle

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abstract = "The purine metabolic enzymes adenosine deaminase (ADA), purine nucleoside phosphorylase (PNP), and 5′nucleotidase (5NT) have been shown to be important for normal lymphocyte maturation. Abnormalities of these enzymes have been associated with hereditary as well as acquired immunodeficiency states. Enzyme activity was measured in helper (OKT4) and suppressor (OKT8) lymphocyte subsets from 10 homosexuals with AIDS-related complex (ARC) and in 10 healthy controls. There were no significant differences in either mean ADA activity or mean PNP activity between ARC OKT4 cells and control OKT4 cells and between ARC OKT8 cells and control OKT8 cells. By contrast, mean 5NT activity was slightly decreased in OKT4 cells from ARC patients compared with that of controls and more significantly diminished in ARC OKT8 cells compared with that of controls. Both deoxyadenosine and deoxyguanosine, when incubated separately with OKT4 and OKT8 cells in the presence of EHNA, and ADA inhibitor, did not significantly inhibit lymphocyte blastogenesis to a greater extent in ARC patients than in controls. Hence, the decreases in 5NT activity most likely reflect lymphocyte immaturity and are not associated with biochemical abnormalities leading to increased deoxynucleoside toxicity.",
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