Mechanisms for T-cell selective cytotoxicity of arabinosylguanine

Carlos O. Rodriguez, Christine M. Stellrecht, Varsha Gandhi

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Nelarabine, prodrug of arabinosylguanine (ara-G), has demonstrated T-lymphoblastic antileukemic activity in cell lines and in the clinic. To investigate the mechanism for lineage-specific toxicity, the effects of ara-G were compared in CEM (T-lymphoblast), Raji (B-lymphoblast), and ML-1 (myeloid) cell lines. CEM cells were the most sensitive to ara-G-induced apoptosis and accumulated the highest levels of ara-G triphosphate (ara-GTP). However, compared with myeloid and B-lineage cell lines, CEM cells incorporated fewer ara-G molecules - which were at internucleotide positions in all 3 cell lines - into DNA. Ara-G induced an S-phase arrest in both Raji and ML-1, while in CEM the S-phase cells decreased with a concomitant increase in the sub-G 1 population. Within 3 hours of ara-G treatment, the levels of soluble Fas ligand (sFasL) in the medium increased significantly in CEM cultures. In parallel, an induction of FasL gene expression was observed by real-time reverse transcriptase-polymerase chain reaction (RT-PCR). Pretreatment of CEM cells with a Fas antagonistic antibody inhibited ara-G - mediated cell death. These results demonstrate that high ara-GTP accumulation in T cells results in an S phase-dependent apoptosis induced by ara-G incorporation into DNA, which may lead to a T cell-specific signal for the induction and liberation of sFasL. Subsequently, the sFasL induces an apoptotic response in neighboring non - S-phase cells. In contrast, myeloid and B cells accumulated lower levels of ara-GTP and arrested in S phase, blocking any apoptotic signaling.

Original languageEnglish (US)
Pages (from-to)1842-1848
Number of pages7
JournalBlood
Volume102
Issue number5
DOIs
StatePublished - Sep 1 2003
Externally publishedYes

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T-cells
Cytotoxicity
S Phase
Cells
Fas Ligand Protein
T-Lymphocytes
Cell Line
Myeloid Cells
Apoptosis
Polymerase chain reaction
RNA-Directed DNA Polymerase
DNA
Prodrugs
Cell death
Reverse Transcriptase Polymerase Chain Reaction
Gene expression
Toxicity
Real-Time Polymerase Chain Reaction
B-Lymphocytes
Cell Death

ASJC Scopus subject areas

  • Hematology

Cite this

Rodriguez, C. O., Stellrecht, C. M., & Gandhi, V. (2003). Mechanisms for T-cell selective cytotoxicity of arabinosylguanine. Blood, 102(5), 1842-1848. https://doi.org/10.1182/blood-2003-01-0317

Mechanisms for T-cell selective cytotoxicity of arabinosylguanine. / Rodriguez, Carlos O.; Stellrecht, Christine M.; Gandhi, Varsha.

In: Blood, Vol. 102, No. 5, 01.09.2003, p. 1842-1848.

Research output: Contribution to journalArticle

Rodriguez, CO, Stellrecht, CM & Gandhi, V 2003, 'Mechanisms for T-cell selective cytotoxicity of arabinosylguanine', Blood, vol. 102, no. 5, pp. 1842-1848. https://doi.org/10.1182/blood-2003-01-0317
Rodriguez, Carlos O. ; Stellrecht, Christine M. ; Gandhi, Varsha. / Mechanisms for T-cell selective cytotoxicity of arabinosylguanine. In: Blood. 2003 ; Vol. 102, No. 5. pp. 1842-1848.
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