In vivo modifications of AcSDKP metabolism and haematopoiesis in mice treated with 5-fluorouracil and Goralatide.

Abstract:

BACKGROUND:The tetrapeptide acetyl-Ser-Asp-Lys-Pro (AcSDKP), a physiological inhibitor of the proliferation of haematopoietic stem cells, is degraded by the angiotensin-I-converting enzyme (ACE). Whereas synthetic AcSDKP (Goralatide) protects normal mice from the haematological toxicity of chemotherapy, it has a lower beneficial effect in humans. This discrepancy could be dependent on Goralatide administration schedules, as well as on the endogenous concentrations of AcSDKP and ACE, which vary during chemotherapy. METHODS:We investigated the effect of one myelotoxic dose of 5-fluorouracil (5-FU, 200 mg kg-1) administered without or with Goralatide on blood, bone marrow (BM) and spleen AcSDKP concentrations, ACE activity, nucleated cell counts and survival of the primitive haematopoietic progenitors high proliferative potential colony-forming cells (HPP-CFCs). RESULTS:The 5-FU treatment dramatically decreased the BM concentrations of AcSDKP by 73% and increased the ACE activity in plasma by 50% during the period of active BM regeneration. Repeated injections of Goralatide from 24 h before to 36 h after the i.p. injection of 5-FU spared BM HPP-CFCs. As an injection of 10 mg of Goralatide induced a short peak of plasma AcSDKP without modifying its BM concentrations, we suggest that its protective effect on HPP-CFCs could be mediated by its interference with other plasma molecules targeting to the BM. CONCLUSION:By improving our knowledge of the biology of AcSDKP in vivo during chemotherapy, our results could help to better define the therapeutic use of Goralatide.

journal_name

Eur J Clin Invest

authors

Comte L,Lorgeot V,Bignon J,Volkov L,Dupuis F,Wdzieczak-Bakala J,Praloran V

doi

10.1046/j.1365-2362.1998.00356.x

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

856-63

issue

10

eissn

0014-2972

issn

1365-2362

journal_volume

28

pub_type

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