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Nature. 2018 Jul;559(7715):632-636. doi: 10.1038/s41586-018-0316-7. Epub 2018 Jul 11.

Histidine catabolism is a major determinant of methotrexate sensitivity.

Author information

1
Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Department of Biology, Cambridge, MA, USA.
2
Howard Hughes Medical Institute, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA.
3
Koch Institute for Integrative Cancer Research and Massachusetts Institute of Technology, Department of Biology, Cambridge, MA, USA.
4
Broad Institute of Harvard and Massachusetts Institute of Technology, Cambridge, MA, USA.
5
Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Department of Biology, Cambridge, MA, USA. sabatini@wi.mit.edu.
6
Howard Hughes Medical Institute, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA. sabatini@wi.mit.edu.
7
Koch Institute for Integrative Cancer Research and Massachusetts Institute of Technology, Department of Biology, Cambridge, MA, USA. sabatini@wi.mit.edu.
8
Broad Institute of Harvard and Massachusetts Institute of Technology, Cambridge, MA, USA. sabatini@wi.mit.edu.

Abstract

The chemotherapeutic drug methotrexate inhibits the enzyme dihydrofolate reductase1, which generates tetrahydrofolate, an essential cofactor in nucleotide synthesis2. Depletion of tetrahydrofolate causes cell death by suppressing DNA and RNA production3. Although methotrexate is widely used as an anticancer agent and is the subject of over a thousand ongoing clinical trials4, its high toxicity often leads to the premature termination of its use, which reduces its potential efficacy5. To identify genes that modulate the response of cancer cells to methotrexate, we performed a CRISPR-Cas9-based screen6,7. This screen yielded FTCD, which encodes an enzyme-formimidoyltransferase cyclodeaminase-that is required for the catabolism of the amino acid histidine8, a process that has not previously been linked to methotrexate sensitivity. In cultured cancer cells, depletion of several genes in the histidine degradation pathway markedly decreased sensitivity to methotrexate. Mechanistically, histidine catabolism drains the cellular pool of tetrahydrofolate, which is particularly detrimental to methotrexate-treated cells. Moreover, expression of the rate-limiting enzyme in histidine catabolism is associated with methotrexate sensitivity in cancer cell lines and with survival rate in patients. In vivo dietary supplementation of histidine increased flux through the histidine degradation pathway and enhanced the sensitivity of leukaemia xenografts to methotrexate. The histidine degradation pathway markedly influences the sensitivity of cancer cells to methotrexate and may be exploited to improve methotrexate efficacy through a simple dietary intervention.

PMID:
29995852
PMCID:
PMC6082631
DOI:
10.1038/s41586-018-0316-7
[Indexed for MEDLINE]
Free PMC Article

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