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Document 0968
DOCN M9460968
TI Human tumor cells secreting IL-2 induce a locally protective immune
response against tumor engraftment (Meeting abstract).
DT 9406
AU Alosco TR; Gansbacher B; Bankert RB; Takita H; Petrelli NJ; Roswell Park
Cancer Inst., Buffalo, NY
SO Society of Surgical Oncology, 46th Annual Cancer Symposium in
Conjunction with Society of Head and Neck Surgeons. March 18-21, 1993,
Los Angeles, CA, p. 107, 1993.. Unique Identifier : AIDSLINE
ICDB/94697346
AB The retroviral transfection of cytokine genes into tumor cells and the
subsequent secretion of various cytokines has lead to regression of
weakly immunogenic murine tumors. The purpose of our study was to
demonstrate that a similar transfection of the IL-2 (interleukin-2) gene
into human tumor cell lines can be done and that the tumor cells will
subsequently secrete IL-2 and become more immunogenic. A retroviral
vector containing the bacterial neomycin resistance gene derived from
the genome of Maloney murine leukemia virus was fused to human IL-2 or
ADA (adenosine deaminase) cDNA. Retroviral vector constructs were
converted to corresponding virus using established procedures. Human
lung tumor cell lines were generated from operative specimens and
exposed to the retroviral vectors. Colonies secreting 0.5-25 Cetus U/ml
of IL-2 were isolated by G418 (neomycin) selection and expanded to cell
lines. Cell lines transfected with the ADA gene instead of the IL-2 gene
were used as controls. Using the C.B17 SCID (severe combined
immunodeficiency) mouse, we have observed that the local secretion of
IL-2 by a murine tumor initiates effector cells of the NK cell and
monocyte, macrophage lineage that can, in the absence of functional T
cells, eliminate the tumor. The secretion of IL-2 has a locally
protective effect on the tumorigenicity of the parental cell line, but
did not have any protective effect when placed at a distant site in the
SCID mouse thereby underscoring the importance of the sustained local
release of IL-2. We similarly show that transfection of the IL-2 gene
into a human squamous cell carcinoma of the lung, as well as a large
cell lung tumor, will abrogate tumorigenicity for up to 3 months
observed, whereas the parental cell line, cell lines secreting low (less
than 10 U/ml) levels of IL-2, and the cell lines transfected with the
ADA gene grow aggressively in the SCID mouse by 4-6 weeks. The local
secretion of IL-2 by the transfected cell line also inhibited tumor
formation by the parental cell line. These results indicate that (1)
transfection of the IL-2 gene into human tumors can be done; (2)
subsequent secretion of IL-2 will occur; and (3) the local secretion of
IL-2 by tumor cells will induce an antitumor response by the host.
DE Adenosine Deaminase/GENETICS Animal Human
Interleukin-2/GENETICS/*SECRETION Lung Neoplasms/*SECRETION Mice
Mice, SCID Retroviridae/GENETICS Transfection Tumor Cells, Cultured
MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).