title: Calorimetric study as a potential test for choosing treatment of B-cell chronic lymphocytic leukemia.
abstract: Differential scanning calorimetry (DSC) and complementary techniques were utilized to evaluate the sensitivity of B-cell chronic lymphocytic leukemia (B-CLL) cell samples in vitro exposed to cladribine or fludarabine in combination with mafosfamide. Mafosfamide, the active in vitro form of cyclophosphamide with both purine analogs produced the cytotoxic effect on mononuclear cell probes, however, to a different degree. Our results indicated that higher sensitivity of examined leukemic cell samples to the used drug combinations was usually accompanied by a marked decrease or even a complete loss of thermal transition at 95+/-3 degrees C in DSC scans of nuclear preparations as well as by more significant reduction of cell viability, higher extent of DNA damage estimated by the comet assay and by dropping/disappearance of anti-apoptotic protein Mcl-1 in comparison with untreated cells. We have also observed that the reduction of transition at 95+/-3 degrees C in thermal scans of nuclear preparations isolated from blood of B-CLL randomized patients who showed response to cladribine or fludarabine combined with cyclophosphamide, i.e., CC and FC, respectively, corresponded with the decrease or disappearance of anti-apoptotic proteins Bcl-2 and/or Mcl 1. In conclusion, these in vitro and in vivo studies revealed that quick DSC technique, usually supplemented by other methods, is a potent tool to distinguish efficacy of B-CLL treatment and could be helpful in choosing the most effective manner of treatment for this type of leukemia.
authors.affiliation: Department of Cytobiochemistry, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland.
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Rogalinska
authors.forename: Pawel
authors.initials: P
authors.lastname: Goralski
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Wozniak
authors.forename: Jolanta D
authors.initials: JD
authors.lastname: Bednarek
authors.forename: Jerzy Z
authors.initials: JZ
authors.lastname: Blonski
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Robak
authors.forename: Henryk
authors.initials: H
authors.lastname: Piekarski
authors.forename: Margaret
authors.initials: M
authors.lastname: Hanausek
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Walaszek
authors.forename: Zofia M
authors.initials: ZM
authors.lastname: Kilianska
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D002152:Calorimetry, Differential Scanning / Q000379:methods*; D002470:Cell Survival; D002478:Cells, Cultured; D017338:Cladribine / Q000494:pharmacology; D003520:Cyclophosphamide / Q000031:analogs & derivatives / Q000494:pharmacology; D004249:DNA Damage; D004338:Drug Combinations; D016903:Drug Monitoring / Q000379:methods*; D005260:Female; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000188:drug therapy*; D008297:Male; D064549:Myeloid Cell Leukemia Sequence 1 Protein; D044367:Phase Transition; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000172:deficiency; D014740:Vidarabine / Q000031:analogs & derivatives / Q000494:pharmacology
chemical_list: D004338:Drug Combinations; D064549:Myeloid Cell Leukemia Sequence 1 Protein; D019253:Proto-Oncogene Proteins c-bcl-2; D017338:Cladribine; C048341:mafosfamide; D003520:Cyclophosphamide; D014740:Vidarabine; C024352:fludarabine