Abstract：
:Tumor cell fractions isolated from tumor lines SH-3 (breast carcinoma) and RPMI-7932 (malignant melanoma) by differential centrifugations were capable of transforming lymphocytes into cytotoxic effector cells. Lymphocytes cultured alone in human AB plasma did not become cytotoxic to tumor cells. However, when cultured with tumor cell fractions sedimented at 1000 X g(R1), 20,000 X g(R2), and 100,000 X g(R3), these lymphocytes became markedly cytotoxic to specific tumor targets in a 3.5-hr (51)Cr release assay. R2 fractions were significantly more immunogenic than were R3 fractions (p less than 0.05). Although lymphocytes sensitized with SH-3 tumor cell fractions were cytotoxic to SH-3 tumor cells, they were also cytotoxic to cells from RPMI-7932 and RPMI-8322 (malignant melanoma) tumor lines and vice versa. Cells from tumor lines HT-29 (colon carcinoma) and COLO 110 (ovary carcinoma) were significantly less susceptible to lysis by effector cells generated against SH-3. These immune cells, although capable of killing cells from tumor lines, were not able to lyse cells from autochthonous normal lymphoid lines or normal lymphocytes that have been transformed by phytohemagglutinin. Tumor cell fractions were not immunogenic at low (5- to 20-mul/0.75 ml) concentrations; an increase of 4- to 10- fold in their concentrations was usually followed by a decrease in immunization.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Sharma Bsubject
Has Abstractpub_date
1977-12-01 00:00:00pages
4660-8issue
12eissn
0008-5472issn
1538-7445journal_volume
37pub_type
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