Induction of differentiation of B-cell leukemia cell lines JVM-2 and EHEB by bryostatin 1.
The effects of bryostatin 1 (Bryo 1), a protein kinase C (PKC) activator, on proliferation, differentiation and macromolecular synthesis were investigated in the two cell lines EHEB and JVM-2, established from patients with chronic B-cell leukemia. Treatment with Bryo 1 inhibited the proliferation, DNA and RNA synthesis in a time- and dose-dependent fashion. The cells differentiated along the B-cell pathway to plasmacytoid cells as judged by morphological examination and increased their production and secretion of immunoglobulins. c-myc mRNA expression was induced in both cell lines. The phorbol ester TPA, a pharmacological PKC activator, had similar differentiation-inducing effects. The biomodulators failed to induce significant alterations in the cell surface marker profile. Except for their surface markers, all parameters studied were more strongly altered in JVM-2 than in EHEB cells. JVM-2 was established from a patient with B-prolymphocytic leukemia (PLL), whereas EHEB originated from a case of B-chronic lymphocytic leukemia (CLL). These data support the notion that PLL cells appear to be activated B-cells, in contrast to the rather quiescent CLL cells. Since Bryo 1 lacks tumor-promoting activity, this naturally occurring compound, extracted from marine animals, has a potential role in the therapy of B-cell neoplasms as a differentiating agent.
DSM-German Collection of Microorganisms and Cell Cultures, Department of Human and Animal Cell Cultures, Braunschweig.
Z B
ZB
Hu
S M
SM
Gignac
C C
CC
Uphoff
H
H
Quentmeier
K G
KG
Steube
H G
HG
Drexler
D000951:Antigens, Neoplasm / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D000970:Antineoplastic Agents / Q000494:pharmacology*; D054713:Bryostatins; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D006801:Humans; D007136:Immunoglobulins / Q000096:biosynthesis; D007783:Lactones / Q000494:pharmacology*; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000235:genetics / Q000276:immunology / Q000473:pathology*; D018942:Macrolides; D011519:Proto-Oncogenes; D014407:Tumor Cells, Cultured
D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D000970:Antineoplastic Agents; D054713:Bryostatins; D007136:Immunoglobulins; D007783:Lactones; D018942:Macrolides; C046785:bryostatin 1