Cited by 111Cancer therapeutics and mechanismsImmunotoxicology and immune responsesHematopoietic Stem Cell Transplantation

Differential toxicity of camptothecin, topotecan and 9-aminocamptothecin to human, canine, and murine myeloid progenitors (CFU-GM) in vitro

Erickson-Miller, C. L., May, Richard D., Tomaszewski, Joseph, Osborn, Blaire, Murphy, Martin J., Page, John G., Parchment, Ralph E.·1997·Cancer Chemotherapy and Pharmacology

Abstract

Purpose 20(S)-Camptothecin (CAM), topotecan (TPT, active ingredient in Hycamtin) and 9-amino-20(S)-camptothecin (9AC) are topoisomerase I inhibitors that cause similar dose-limiting toxicities to rapidly renewing tissues, such as hematopoietic tissues, in humans, mice, and dogs. However, dose-limiting toxicity occurs at tenfold lower doses in humans than in mice. The purpose of the current study was to determine whether hematopoietic progenitors of the myeloid lineage from humans, mice, and dogs exhibit the differential sensitivity to these compounds that is evident in vivo.Methods Drug-induced inhibition of in vitro colony formation by a myeloid progenitor in human, murine, and canine marrow colony-forming unit-granulocyte/macrophage (CFU-GM) provided the basis for interspecies comparisons at concentrations which inhibited colony formation by 50% (IC50) and 90% (IC90).Results Murine IC90 values were 2.6-, 2.3-, 10-, 21-, 5.9-, and 11-fold higher than human values for CAM lactone (NSC-94600) and sodium salt (NSC-100880), TPT (NSC-609699), and racemic (NSC-629971), semisynthetic and synthetic preparations (NSC-603071) of 9AC, respectively. In contrast, canine IC90 values were the same as, or lower than, the human IC90 values for all six compounds.Conclusions The greater susceptibility of humans and dogs to the myelotoxicity of camptothecins, compared to mice, was evident in vitro at the cellular level. Differential sensitivity between murine and human myeloid progenitors explains why the curative doses of TPT and 9AC in mice with human tumor xenografts are not achievable in patients. Realizing the curative potential of these compounds in humans will require the development of therapies to increase drug tolerance of human CFU-GM at least to a level equal to that of murine CFU-GM. Because these interspecies differences are complicated by species-specific effects of plasma proteins on drug stability, not all in vitro assay conditions will yield results which can contribute to the development of such therapies.

Integrity signals

Registry

Crossref · 10.1007/s002800050600

Cites

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Still being checked.

Cited by

Sorted by citations

Authors
Erickson-Miller, C. L., May, R. D., Tomaszewski, J., Osborn, B., Murphy, M. J., Page, J. G., & Parchment, R. E.
Affiliations
  • Southern Research Institute (US)
  • National Institutes of Health (US)
  • Hipple Cancer Research Center (US)
Venue
Cancer Chemotherapy and Pharmacology
Published
1997-02-10
Volume
39
Issue
5
Pages
467-472
ISSN
  • 0344-5704 (ISSN-L)
  • 1432-0843
OpenAlex
W1995743646
Cited by
111
References
0
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2021: 1 · 2019: 1 · 2018: 2 · 2017: 5 · 2016: 2 · 2015: 4 · 2014: 3 · 2013: 8 · 2012: 5
FWCI
1.66
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Chemotherapy and Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (n01cm087259-000)
  • National Cancer Institute (CM-07361, N01-CM-87259)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cancer therapeutics and mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotoxicology and immune responses
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
Keywords
camptothecin, topotecan, 9-aminocamptothecin, topoisomerase I inhibitor, myelosuppression, CFU-GM, myeloid progenitor cells, human-mouse differences, canine, hematopoietic toxicity, dose-limiting toxicity, drug tolerance, colony formation inhibition
MeSH terms
Animals, Antineoplastic Agents, Phytogenic, Bone Marrow Cells, Camptothecin, Cells, Cultured, Colony-Forming Units Assay, Dogs, Hematopoietic Stem Cells, Humans, Interleukin-3, Recombinant Proteins, Granulocyte-Macrophage Colony-Stimulating Factor, Topotecan, Mice, Topoisomerase II Inhibitors

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review