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Recombinant glycosylated human interleukin-6 accelerates peripheral blood
platelet count recovery in radiation-induced bone marrow depression in
baboons
F Herodin, JC Mestries, D Janodet, S Martin, J Mathieu, MP Gascon, MO Pernin and A Ythier
Department of Radiobiology, Centre de Recherches du Service de Sante des
Armees, La Tronche, France.
This report was aimed at confirming the potential clinical use for a
genetically engineered glycosylated human interleukin-6 (rhIL-6) in
hematopoiesis. Its tolerance and efficacy were assessed on hematopoietic
restoration after neutron radiation-induced bone marrow injury on baboons,
which represent an adequate model of parallelism for studying hematology in
the human. The particular neutron radiation absorption pattern in the body
allows the preservation of underexposed bone marrow areas that mimics an
autotransplantation-like situation. An initial dose finding study (1
microgram up to 20 micrograms/kg/d for 8 consecutive days) in normal
baboons established a dose-dependent response regarding the peripheral
platelet count (range of increase, 1.5- to 4-fold). A significant elevation
in white blood cell (WBC) count, as well as a substantial reversible
normochromic normocytic anemia, were observed for the highest doses only
(10 and 20 micrograms/kg/d). All rhIL-6 administered doses were clinically
well tolerated. In myelosuppressed baboons, a selected dose of 10
micrograms/kg/d of rhIL-6 for 13 consecutive days significantly lessened
the degree of induced thrombocytopenia as compared with the control group
(P = .01) and shortened the time to occurrence of the nadir, showing that
the onset of recovery occurs much earlier, ie, an average of 5 days (P =
.003), in the treated group. Moreover, this accelerated platelet recovery
is evidenced by an 8-day shorter mean time back to baseline values (P =
.03) in the rhIL-6--treated animals. At this dose no effect was observed on
the WBC recovery pattern. Importantly rhIL-6 did not accentuate the
radiation-induced anemia and was clinically well tolerated. All tested
monkeys recovered from their induced pancytopenia and no animal loss was
recorded. IL-6, tumor necrosis factor, and IL-1 blood measurements are
reported. In conclusion, rhIL-6 is a potent thrombopoietic factor for the
treatment of induced thrombocytopenia in nonhuman primates at a clinically
well- tolerated dose.
Volume 80,
Issue 3,
pp. 688-695,
08/01/1992
Copyright © 1992 by The American Society of Hematology

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