Abstract:
:Interleukin-3 (IL-3) has been shown to be a promising agent in the stimulation of bone marrow regeneration following myeloablative therapy. The biologic half-life of this agent is very short (5 to 15 minutes), which limits the effectiveness of low-dose therapy. Here we show that the biologic effects of low-dose IL-3 in mice may be enhanced by concurrent use of polyclonal anti-IL-3 antibodies. The biologic effects of IL-3 in vivo were enhanced dramatically by the combination of the cytokine and polyclonal rabbit anti-IL-3 antibodies, which recognized a peptide comprising the first 29 amino acids of the IL-3 molecule. Enhancing effects were not apparent in vitro, where weak neutralizing properties were observed for these antibodies. The mechanism of this enhancement by the antibody appears to be via a ninefold reduction in the total-body clearance of the cytokine in vivo. The apparent volumes of distribution for IL-3 and for the IL-3/antibody complex were surprisingly similar and exceeded the expected intravascular volume. The prolonged biologic half-life of IL-3 was reproducibly associated with a threefold to fivefold increase in splenic mast-cell precursors over levels observed in mice treated with IL-3 alone; increases in the numbers of mature mucosal-type mast cells in the spleen, but not in the jejunum or lung; increases in IL-3-dependent colony-forming unit-cell in the spleen; and an apparent redistribution of mast cells away from the bone marrow. These experiments demonstrate that antibodies to a cytokine can enhance the biologic activity of that cytokine in vivo.
journal_name
Bloodjournal_title
Bloodauthors
Jones AT,Ziltener HJsubject
Has Abstractpub_date
1993-08-15 00:00:00pages
1133-41issue
4eissn
0006-4971issn
1528-0020journal_volume
82pub_type
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