TY - JOUR
T1 - Expression and function of leptin receptor isoforms in myeloid leukemia and myelodysplastic syndromes
T2 - Proliferative and anti-apoptotic activities
AU - Konopleva, Marina
AU - Mikhail, Adel
AU - Estrov, Zeev
AU - Zhao, Shourong
AU - Harris, David
AU - Sanchez-Williams, Gisela
AU - Kornblau, Steven M.
AU - Dong, Joan
AU - Kliche, Kay Oliver
AU - Jiang, Shuwei
AU - Snodgrass, H. Ralph
AU - Estey, Elihu H.
AU - Andreeff, Michael
PY - 1999/3/1
Y1 - 1999/3/1
N2 - The receptor for the gene product of the obesity gene, leptin, was recently reported to be expressed on murine and human hematopoietic progenitor cells. Therefore, we studied the expression of the leptin receptor, OB-R, in normal myeloid precursors, human leukemia cell lines, and primary leukemic cells using reverse-transcriptase polymerase chain reaction. In normal hematopoiesis, OB-R was expressed in CD34+ cells. Normal promyelocytes (CD34-33+ and CD34-13+) expressed only very low levels of the short, presumably nonsignaling isoform. Both the long and short isoforms of OB-R were expressed in 10 of 22 samples from patients with newly diagnosed primary or secondary acute myeloid leukemia (AML), with a higher incidence of the long isoform in primary AML (87.6% v 26.6%; P = .01). The incidence of OB-R expression was higher in recurrent than in newly diagnosed AML (P < .001), and samples from four patients with refractory AML showed strong expression of both isoforms. Both OB-R isoforms were also expressed in newly diagnosed and recurrent acute promyelocytic leukemia cells but were essentially absent in samples of chronic or acute lymphocytic leukemia. In vitro growth of myeloid leukemic cell lines and of blasts from 14 primary AMLs demonstrated that recombinant human leptin alone induced low level proliferation, significantly (P< .05) increased proliferation induced by recombinant human granulocyte colony-stimulating factor, interleukin 3, and stem cell factor in a subset of AML and increased colony formation (P < .005). Also, leptin reduced apoptosis induced by cytokine withdrawal in MO7E and TF-1 cells. Serum leptin levels correlated only with body mass index (P < .001) and gender (P = .03). Results confirm the reported expression of leptin receptor in normal CD34+ cells and demonstrate the frequent expression of leptin receptors in AML blasts. While normal promyelocytes lack receptor expression, leukemic promyelocytes express both isoforms. We also demonstrate proliferative effects of leptin alone and in combination with other physiologic cytokines, and antiapoptotic properties of leptin. These findings could have implications for the pathophysiology of AML.
AB - The receptor for the gene product of the obesity gene, leptin, was recently reported to be expressed on murine and human hematopoietic progenitor cells. Therefore, we studied the expression of the leptin receptor, OB-R, in normal myeloid precursors, human leukemia cell lines, and primary leukemic cells using reverse-transcriptase polymerase chain reaction. In normal hematopoiesis, OB-R was expressed in CD34+ cells. Normal promyelocytes (CD34-33+ and CD34-13+) expressed only very low levels of the short, presumably nonsignaling isoform. Both the long and short isoforms of OB-R were expressed in 10 of 22 samples from patients with newly diagnosed primary or secondary acute myeloid leukemia (AML), with a higher incidence of the long isoform in primary AML (87.6% v 26.6%; P = .01). The incidence of OB-R expression was higher in recurrent than in newly diagnosed AML (P < .001), and samples from four patients with refractory AML showed strong expression of both isoforms. Both OB-R isoforms were also expressed in newly diagnosed and recurrent acute promyelocytic leukemia cells but were essentially absent in samples of chronic or acute lymphocytic leukemia. In vitro growth of myeloid leukemic cell lines and of blasts from 14 primary AMLs demonstrated that recombinant human leptin alone induced low level proliferation, significantly (P< .05) increased proliferation induced by recombinant human granulocyte colony-stimulating factor, interleukin 3, and stem cell factor in a subset of AML and increased colony formation (P < .005). Also, leptin reduced apoptosis induced by cytokine withdrawal in MO7E and TF-1 cells. Serum leptin levels correlated only with body mass index (P < .001) and gender (P = .03). Results confirm the reported expression of leptin receptor in normal CD34+ cells and demonstrate the frequent expression of leptin receptors in AML blasts. While normal promyelocytes lack receptor expression, leukemic promyelocytes express both isoforms. We also demonstrate proliferative effects of leptin alone and in combination with other physiologic cytokines, and antiapoptotic properties of leptin. These findings could have implications for the pathophysiology of AML.
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U2 - 10.1182/blood.v93.5.1668
DO - 10.1182/blood.v93.5.1668
M3 - Article
C2 - 10029596
AN - SCOPUS:0033104708
SN - 0006-4971
VL - 93
SP - 1668
EP - 1676
JO - Blood
JF - Blood
IS - 5
ER -