Effect of a Streptococcal Preparation (OK432) on Natural Killer Activity of Tumour-associated Lymphoid Cells in Human Ovarian Carcinoma and on Lysis of Fresh Ovarian Tumour Cells

Overview

Journal Br J Cancer

Specialty Oncology

Date 1983 Oct 1

PMID 6626452

Citations 9

Authors

F Colotta

A Rambaldi

N Colombo

L Tabacchi

M Introna

A Mantovani

Affiliations

Soon will be listed here.

Abstract

The streptococcal preparation OK432 was studied for its effects on natural killer (NK) activity of peripheral blood lymphocytes (PBL) from normal donors and from ovarian cancer patients, and of tumour-associated lymphocytes (TAL) from peritoneal effusions. OK432 augmented NK activity against the susceptible K562 line and induced killing of the relatively resistant Raji line. Freshly isolated ovarian carcinoma cells were relatively resistant to killing by unstimulated PBL and TAL. OK432 induced significant, though low, levels of cytotoxicity against 51Cr-labelled ovarian carcinoma cells. Augmentation of killing of fresh tumour cells by OK432 was best observed in a 20 h assay and both autologous and allogeneic targets were lysed. PBL were separated on discontinuous Percoll gradients. Unstimulated and OK432-boosted activity were enriched in the lower density fractions where large granular lymphocytes (LGL) and activity against K562 were found. Thus, OK432 augments NK activity of PBL and TAL in human ovarian carcinomas and induces low, but significant, levels of killing of fresh tumour cells. Effector cells involved in killing of fresh ovarian tumours copurify with LGL on discontinuous gradients of Percoll.

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