SAMHD1 Limits the Efficacy of Forodesine in Leukemia by Protecting Cells against the Cytotoxicity of dGTP | Zendy

Tamara Davenne | Zendy; Jenny Klintman | Zendy; Sushma Sharma | Zendy; Rachel E. Rigby | Zendy; Henry T.W. Blest | Zendy; Chiara Cursi | Zendy; Anne Bridgeman | Zendy; Bernadeta Dadonaite | Zendy; Kim De Keersmaecker | Zendy; Peter Hillmen | Zendy; Andrei Chabes | Zendy; Anna Schuh | Zendy; Jan Rehwinkel | Zendy

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SAMHD1 Limits the Efficacy of Forodesine in Leukemia by Protecting Cells against the Cytotoxicity of dGTP

Author(s) -

Tamara Davenne,

Jenny Klintman,

Sushma Sharma,

Rachel E. Rigby,

Henry T.W. Blest,

Chiara Cursi,

Anne Bridgeman,

Bernadeta Dadonaite,

Kim De Keersmaecker,

Peter Hillmen,

Andrei Chabes,

Anna Schuh,

Jan Rehwinkel

Publication year - 2020

Publication title -

cell reports

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 6.264

H-Index - 154

eISSN - 2639-1856

pISSN - 2211-1247

DOI - 10.1016/j.celrep.2020.107640

Subject(s) - samhd1 , chronic lymphocytic leukemia , cytotoxicity , leukemia , deoxyguanosine , cancer research , cytotoxic t cell , chemistry , apoptosis , microbiology and biotechnology , biochemistry , biology , dna , immunology , in vitro , reverse transcriptase , rna , gene

Summary The anti-leukemia agent forodesine causes cytotoxic overload of intracellular deoxyguanosine triphosphate (dGTP) but is efficacious only in a subset of patients. We report that SAMHD1, a phosphohydrolase degrading deoxyribonucleoside triphosphate (dNTP), protects cells against the effects of dNTP imbalances. SAMHD1-deficient cells induce intrinsic apoptosis upon provision of deoxyribonucleosides, particularly deoxyguanosine (dG). Moreover, dG and forodesine act synergistically to kill cells lacking SAMHD1. Using mass cytometry, we find that these compounds kill SAMHD1-deficient malignant cells in patients with chronic lymphocytic leukemia (CLL). Normal cells and CLL cells from patients without SAMHD1 mutation are unaffected. We therefore propose to use forodesine as a precision medicine for leukemia, stratifying patients by SAMHD1 genotype or expression.

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