New concepts for the development and use of antifolates

Edward Chu, Jean L Grem, Patrick G. Johnston, Carmen J. Allegra

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Approximately one-third of all cases of colorectal carcinoma present in an advanced and, therefore, incurable stage. For these patients, the development of new chemotherapeutic strategies is of central importance. Biochemical modulation of 5-fluorouracil (5-FU) has resulted in approximately a twofold increase in activity of 5-FU. Recent preclinical investigations suggest that interferon can also modulate the activity of 5-FU and may result in enhanced response rates in patients. One of the critical mechanisms of resistance to 5-FU appears to be the acute induction in thymidylate synthase (TS) levels following therapy with inhibitors of this enzyme. This mechanism is based on a novel autoregulatory feedback pathway wherein the TS protein regulates its own translational efficiency. Regulatory function of the enzyme is dependent on its state of occupancy by either the physiologic ligands or inhibitors, including fluoropyrimidines and antifolates. Ongoing efforts are directed toward utilizing knowledge of this protein/messenger RNA interaction for therapeutic benefit. Given the importance of TS, our laboratory has developed antibodies capable of quantitating the levels of this enzyme in fresh or paraffin-embedded tissues. Preliminary investigations suggest that the level of TS has prognostic importance in patients with rectal carcinoma and may be used to predict responsiveness to fluoropyrimidine agents. Novel strategies utilizing dual modulation of 5-FU with leucovorin and Interferon are under investigation in both the advanced and adjuvant disease settings. Emerging mechanistic concepts regarding TS, along with the development of new, more potent inhibitors will hopefully result in future therapeutic gains.

Original languageEnglish (US)
Pages (from-to)255-260
Number of pages6
JournalOncologist
Volume1
Issue number4
StatePublished - Dec 1 1996

Fingerprint

Folic Acid Antagonists
Thymidylate Synthase
Fluorouracil
Interferons
Leucovorin
Enzyme Inhibitors
Enzymes
Paraffin
Colorectal Neoplasms
Proteins
Therapeutics
Ligands
Carcinoma
Messenger RNA
Antibodies

Keywords

  • Antifolates
  • Biochemical modulation
  • Enzyme regulation
  • Immunohistochemistry
  • Interferon
  • Monoclonal antibodies
  • Thymidylate synthase

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Chu, E., Grem, J. L., Johnston, P. G., & Allegra, C. J. (1996). New concepts for the development and use of antifolates. Oncologist, 1(4), 255-260.

New concepts for the development and use of antifolates. / Chu, Edward; Grem, Jean L; Johnston, Patrick G.; Allegra, Carmen J.

In: Oncologist, Vol. 1, No. 4, 01.12.1996, p. 255-260.

Research output: Contribution to journalArticle

Chu, E, Grem, JL, Johnston, PG & Allegra, CJ 1996, 'New concepts for the development and use of antifolates', Oncologist, vol. 1, no. 4, pp. 255-260.
Chu E, Grem JL, Johnston PG, Allegra CJ. New concepts for the development and use of antifolates. Oncologist. 1996 Dec 1;1(4):255-260.
Chu, Edward ; Grem, Jean L ; Johnston, Patrick G. ; Allegra, Carmen J. / New concepts for the development and use of antifolates. In: Oncologist. 1996 ; Vol. 1, No. 4. pp. 255-260.
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