title: Cryopreservative effect of leupeptin on early human bone marrow progenitors.
abstract: Leupeptin, a thiol- and serine-proteinase inhibitor of low molecular weight, quickly enters viable cells. This property has been used to protect cells during thawing against intracellular proteolytic activities released by injured lysosomes. The bone marrow nucleated cells were frozen without rate-controlled freezing devices. Concentrations ranging from 0.1 to 1 microM of leupeptin allow to recover 87% of the most immature multipotent bone marrow progenitors which can develop in vitro into large multilineage colonies, instead of 58% recovery without leupeptin. The protective effect of leupeptin is particularly useful to freeze cells difficult to cryopreserve or when freezing-control equipment are not available.
authors.affiliation: Laboratoire C. N. R. S. de Biologie Cellulaire et Moléculaire des Facteurs de Croissance, ICIG, Hôpital Paul-Brousse, Villejuif, France.
authors.forename: M L
authors.initials: ML
authors.lastname: Li
authors.forename: B
authors.initials: B
authors.lastname: Panterne
authors.forename: J P
authors.initials: JP
authors.lastname: Levesque
authors.forename: A
authors.initials: A
authors.lastname: Hatzfeld
authors.forename: J
authors.initials: J
authors.lastname: Hatzfeld
mesh_terms: D001853:Bone Marrow / Q000187:drug effects / Q000648:ultrastructure; D001854:Bone Marrow Cells; D002478:Cells, Cultured; D015925:Cryopreservation / Q000379:methods; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007976:Leupeptins / Q000494:pharmacology*; D008247:Lysosomes / Q000187:drug effects / Q000201:enzymology; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000648:ultrastructure
chemical_list: D007976:Leupeptins