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In Vitro Effect of Acetyl-N-Ser-Asp-Lys-Pro (AcSDKP) Analogs Resistant to Angiotensin I-Converting Enzyme on Hematopoietic Stem Cell and Progenitor Cell Proliferation

^a Institut de Chimie des Substances Naturelles, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France;
^b School of Biological and Medical Sciences, University of St Andrews, St Andrews, Scotland, UK;
^c Department of Radiobiology, University of Groningen, Groningen, The Netherlands

Key Words. AcSDKP • Proliferation inhibitor • AcSDKP analogs • Pseudopeptides • Hematopoietic stem cell • ACE

Dr. Catherine Grillon, Institut de Chimie des Substances Naturelles, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette Cedex, France.

The tetrapeptide Acetyl-N-Ser-Asp-Lys-Pro (AcSDKP), an inhibitor of hematopoietic stem cell proliferation, is known to reduce in vivo the damage resulting from treatment with chemotherapeutic agents or ionizing radiation on the stem cell compartment. Recently, AcSDKP has been shown to be a physiological substrate of the N-active site of angiotensin I-converting enzyme (ACE). Four analogs of the tetrapeptide expressing a high stability towards ACE degradation in vitro have been synthesized in order to provide new molecules likely to improve the myeloprotection displayed by AcSDKP. These analogs are three pseudopeptides with a modified peptidic bond, Ac-Ser(CH₂-NH)Asp-Lys-Pro, Ac-Ser-Asp(CH₂-NH)Lys-Pro, Ac-Ser-Asp-Lys(CH₂-N)Pro, and one C-terminus modified peptide (AcSDKP-NH₂). We report here that these analogs reduce in vitro the proportion of murine colony-forming units-granulocyte/macrophage in S-phase and inhibit the entry into cycle of high proliferative potential colony-forming cells. The efficacy of AcSDKP analogs in preventing in vitro primitive hematopoietic stem cells from entering into cycle suggests that these molecules could be new candidates for the powerful inhibition of hematopoietic stem and progenitor cell proliferation in vivo.

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