In vivo hematologic effects of recombinant interleukin-6 on hematopoiesis and circulating numbers of RBCs and WBCs.
Interleukin-6 (IL-6) administered as a single intravenous (IV) injection caused the following changes in the peripheral circulation of rats: (a) a biphasic neutrophilia with an initial peak at 1.5 hours and a second sustained wave of neutrophilia between four and 12 hours, (b) a mild lymphocytosis at 0.5 hours and a mild lymphopenia between 1.5 and four hours, and (c) a reticulocytosis between 12 and 24 hours. The bone marrow showed no significant changes at 1.5 hours, suggesting that the peripheral neutrophilia at that time is caused by demargination of intravascular neutrophils and not by release of marrow neutrophils. The bone marrow at 12 hours showed a mild left-shifted myeloid hyperplasia of myeloblasts and promyelocytes and a tremendous erythroid hyperplasia of intermediate and late normoblasts. The bone marrow at 24 hours showed a continued mild myeloid hyperplasia and striking erythroid hyperplasia. In conclusion, IL-6 in vivo acts as a stimulus for myelopoiesis and erythropoiesis and causes accompanying peripheral changes in the number of neutrophils, lymphocytes, and RBCs.
School of Medicine, Department of Pathology, University of California, Irvine 92717.
T R
TR
Ulich
J
J
del Castillo
K Z
KZ
Guo
D000818:Animals; D001853:Bone Marrow / Q000187:drug effects / Q000473:pathology; D002454:Cell Differentiation / Q000187:drug effects; D004906:Erythrocyte Count / Q000187:drug effects*; D006410:Hematopoiesis / Q000187:drug effects*; D006965:Hyperplasia / Q000097:blood / Q000139:chemically induced; D007275:Injections, Intravenous; D015850:Interleukin-6; D007378:Interleukins / Q000008:administration & dosage*; D007700:Kinetics; D007958:Leukocyte Count / Q000187:drug effects*; D007964:Leukocytosis / Q000139:chemically induced; D007970:Leukopenia / Q000139:chemically induced; D008297:Male; D051381:Rats; D011917:Rats, Inbred Lew; D011994:Recombinant Proteins / Q000008:administration & dosage*
D015850:Interleukin-6; D007378:Interleukins; D011994:Recombinant Proteins