Constitutive expression of the interleukin-6 gene in chronic lymphocytic
leukemia
A Biondi, V Rossi, R Bassan, T Barbui, S Bettoni, M Sironi, A Mantovani and A Rambaldi
Clinica Pediatrica Universita di Milano, Ospedale S. Gerardo, Italy.
Interleukin-6 (IL-6) is a pleiotropic lymphokine active as a growth factor
on B-cell hybridomas and plasmacytomas and found to be identical with
B-cell stimulatory factor 2, interferon beta 2, 26-Kd protein, and
hepatocytes stimulating factor. IL-6 gene expression was investigated in
fresh human chronic lymphocytic leukemia (B-CLL) and in acute lymphoblastic
leukemia (ALL) by Northern blot analysis using a specific cDNA probe.
1.3-kb IL-6 transcript was found in six out of 11 B-CLL patients, while no
hybridization was observed in ten cases of ALL of both T- and B-cell
origin. The constitutive expression of IL-6 transcripts was associated with
production of a biologically active protein as determined by using the
IL-6-dependent 7TD1 cell line. It remains to be elucidated whether IL-6
gene expression is indeed important in the regulation of B-CLL growth or in
its clinical manifestation.
Volume 73,
Issue 5,
pp. 1279-1284,
04/01/1989
Copyright © 1989 by The American Society of Hematology