Abstract:
:The receptor for the inflammatory peptide C3a has scarcely been examined on human cells. This work demonstrates that human tumor-derived basophilic granulocytes express C3a receptors, and presents parts of the hitherto unknown C3a-signal transduction. When incubated with IL-3, these cells specifically liberated histamine on C3a stimulation. Independent from IL-3, 240,000 +/- 100,000 receptors per cell with a Kd of 5.6 +/- 0.9 nM were determined. [Ca2+]i increased from 120 +/- 35 nM to 300 +/- 80 nM after a C3a challenge, as measured by digital imaging fluorescence microscopy, and rested at its basal level in the presence of C3a-desArg, the immediate catabolic product of C3a in vivo. This [Ca2+]i increase could be completely desensitized homologously by C3a as well as inhibited by up to 75% by pertussis toxin. Thus, tumor-derived basophils are suitable for cloning of the human C3a receptor.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Kretzschmar T,Jeromin A,Gietz C,Bautsch W,Klos A,Köhl J,Rechkemmer G,Bitter-Suermann Ddoi
10.1002/eji.1830230239subject
Has Abstractpub_date
1993-02-01 00:00:00pages
558-61issue
2eissn
0014-2980issn
1521-4141journal_volume
23pub_type
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journal_title:European journal of immunology
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