PMID- 7545835 OWN - NLM STAT- MEDLINE DCOM- 19951017 LR - 20190819 IS - 0300-483X (Print) IS - 0300-483X (Linking) VI - 101 IP - 3 DP - 1995 Aug 25 TI - The tolerability and pharmacology of interleukin-6 administered in combination with GM-CSF or G-CSF in the rhesus monkey. PG - 157-66 AB - The tolerability and potential target organ toxicity of rhIL-6 administered subcutaneously (s.c.) with rhGM-CSF or rhG-CSF were investigated in healthy nonhuman primates. Fifteen Rhesus monkeys were randomized to receive one of the following five regimens: rhIL-6, rhGM-CSF, rhG-CSF, rhIL-6 and rhGM-CSF, or rhIL-6 and rhG-CSF. Each cytokine was administered s.c. once daily at 20 micrograms/kg/day for 30-31 days. Marked increases in blood leukocyte counts (predominantly neutrophils) were observed in the rhGM-CSF and rhG-CSF treatment groups, but only a mild trend toward increased WBCs was observed with rhIL-6 alone. Platelet counts increased 1.7- to 2.2-fold in the rhIL-6 and rhGM-CSF groups. All regimens were well tolerated. RhIL-6, alone or in combination with either CSF, had no significant toxic effects at the dosages tested. Minimal to moderate bone marrow hyperplasia was observed in all except rhIL-6-treated animals, which correlated well with peripheral blood increases in WBCs. RhIL-6-treated animals demonstrated increased fibrinogen concentrations and erythrocyte sedimentation rates, decreased serum albumin/globulin ratios, and increased serum alpha-2-macroglobulin concentrations. Increased synthesis of acute-phase proteins was not observed in the other groups. Combining rhIL-6 with rhGM-CSF or rhG-CSF may reduce the rhIL-6-mediated acute-phase response while maintaining the desirable hematopoietic effects of the stimulating factors. FAU - Myers, L A AU - Myers LA AD - Department of Drug Safety, Sandoz Pharmaceuticals Corporation, East Hanover, NJ 07936, USA. FAU - Boyce, J T AU - Boyce JT FAU - Robison, R L AU - Robison RL LA - eng PT - Comparative Study PT - Journal Article PL - Ireland TA - Toxicology JT - Toxicology JID - 0361055 RN - 0 (Drug Combinations) RN - 0 (Interleukin-6) RN - 0 (Serum Albumin) RN - 143011-72-7 (Granulocyte Colony-Stimulating Factor) RN - 83869-56-1 (Granulocyte-Macrophage Colony-Stimulating Factor) SB - IM MH - Animals MH - Blood/*drug effects MH - Blood Sedimentation/drug effects MH - Drug Combinations MH - Drug Evaluation, Preclinical MH - Granulocyte Colony-Stimulating Factor/*administration & dosage MH - Granulocyte-Macrophage Colony-Stimulating Factor/*administration & dosage MH - Injections, Subcutaneous MH - Interleukin-6/administration & dosage/*toxicity MH - Macaca mulatta MH - Male MH - Random Allocation MH - Serum Albumin/drug effects EDAT- 1995/08/25 00:00 MHDA- 1995/08/25 00:01 CRDT- 1995/08/25 00:00 PHST- 1995/08/25 00:00 [pubmed] PHST- 1995/08/25 00:01 [medline] PHST- 1995/08/25 00:00 [entrez] AID - 0300483X9503081P [pii] AID - 10.1016/0300-483x(95)03081-p [doi] PST - ppublish SO - Toxicology. 1995 Aug 25;101(3):157-66. doi: 10.1016/0300-483x(95)03081-p.