Abstract:
:Monoclonal antibodies (mAbs) specific for a putative antigen receptor (function associated molecule, FAM) on fish NCC were tested for their ability to initiate signal transduction responses. Anti-FAM hybridoma target cells were significantly lysed by NCC when tested by redirected lysis (RL). Redirected lysis was enhanced by 1-h pretreatment of the NCC with anti-FAM mAb; however, 18-h pretreatment produced significant inhibition. The effects of the calcium ionophore A23187 on RL were also examined: 10(-4) M but not 10(-5) M A23187 significantly increased RL. Purified NCC were treated with mAb and cellular DNA synthesis was determined. Significant increases in NCC incorporation of tritiated thymidine were measured 72 h after treatment with mAb. Experiments were also conducted to determine levels of free cytosolic calcium in NCC following mAb binding. Anti-FAM mAb binding produced a rapid rise in cytosolic calcium (200-500 nM) determined by Fura-2/AM fluorescence. Calcium ionophore A23187, PHA, and Con-A treatment of NCC also produced significantly increased [Ca2+]i. Target cell binding by NCC caused a three-fold increase in [Ca2+]i. These data suggest that triggering of the FAM may initiate a signal(s) that activates cytotoxicity, increases cytosolic free calcium concentrations, and initiates DNA synthesis.
journal_name
Dev Comp Immunoljournal_title
Developmental and comparative immunologyauthors
Evans DL,Harris DT,Jaso-Friedmann Ldoi
10.1016/0145-305x(92)90040-jkeywords:
subject
Has Abstractpub_date
1992-09-01 00:00:00pages
383-94issue
5eissn
0145-305Xissn
1879-0089pii
0145-305X(92)90040-Jjournal_volume
16pub_type
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