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VINCENZO ARIZZA

Cytotoxic activity of Ciona intestinalis (Tunicata) hemocytes: Properties of the in vitro reaction against erythrocyte targets

  • Autori: Parrinello, N.; Arizza, V.; Cammarata, M.; Parrinello, D.
  • Anno di pubblicazione: 1993
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: Cytotoxicity;; Immunology
  • OA Link: http://hdl.handle.net/10447/146452

Abstract

Hemocytes (effectors) of Ciona intestinalis showed a natural cytotoxic capacity (HCA) when assayed in vitro against erythrocytes (targets). Cytotoxic cells lysed, to a variable extent, rabbit (RE), human (A, B, O), guinea pig, and sheep (SE) erythrocytes. Hemocyte cytotoxic activity (HCA) assayed against SE is a calcium-dependent reaction, occurs rapidly (15-30 min), at 25-37°C over a wide range of pH (5.4-8.0). Assays were carried out using: 1) the medium in which hemocytes were maintained, 2) the soluble portion of hemocyte lysates, and 3) debris prepared from hemocyte lysates. Results suggest that HCA is a cell-mediated process that requires effector-target cell contacts. Anti-SE (calcium-dependent) and anti-RE (calcium-independent) agglutinins were also found in the reaction medium, probably released by hemocytes as a consequence of the in vitro experiments. The occurrence of HCA was independent of any allogeneic reaction between mixed hemocytes. Various levels of cytotoxic activity reveal hemocyte specificity. © 1993.