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1994-05-10
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Document 0971
DOCN M9460971
TI Identification and characterization of novel antigenic determinants and
endogenous retroviruses in normal and neoplastic canine lymphoid cells.
DT 9406
AU Jure MN; No affiliation given
SO Diss Abstr Int [B]; 54(2):685 1993. Unique Identifier : AIDSLINE
ICDB/94696659
AB Studies were conducted to characterize the canine species as a model of
lymphomagenesis. The first objective was to develop monoclonal
antibodies against canine lymphocyte surface antigens and apply these
reagents in the characterization of canine lymphoid malignancies.
Second, since several lines of evidence indicated that endogenous
retroviruses were expressed in lymphoid neoplasms and transformed cells,
a study designed to identify endogenous retroviruses in the canine
genome was undertaken. Several monoclonal antibodies were produced.
Monoclonal antibody 2E9 recognized a panleukocyte antigen absent from
certain T-cell hyperplasias that appears as a useful reagent for the
discrimination between this type of hyperplasia and lymphomas.
Monoclonal antibody 8E3 recognized an antigen detected on the surface of
lymphoid malignancies, mitogen-stimulated lymphocytes, and transformed
cell lines but not on normal resting cells. Monoclonal antibody 7A4
bound to an activation antigen also expressed on immature lymphocytes.
Monoclonal antibodies 7A4 and 8E3 appear as useful reagents for the
classification, diagnosis and prognosis of canine lymphoid neoplasms.
Reverse transcriptase (RT) activity (Mn++ dependent) was detected in the
supernatant of a canine transformed cell line. Particles containing RT
activity banded in sucrose at a density of 1.15 g/cc. RNA contained in
these particles was subjected to a RT-PCR-based procedure using
degenerate primers derived from a conserved region of the retroviral
polymerase gene. A predicted product of 136 bp was obtained, cloned and
sequenced. The amplified product showed 61% homology to the simian type
D retrovirus SRV-2 and complete homology with a consensus amino acid
sequence derived from known retroviruses. A probe derived from the
cloned amplified fragment was used to hybridize canine genomic DNA.
Southern blot analysis showed that between 1 and 10 copies of this gene
are present in the canine genome. In addition, a canine genomic library
was screened with the amplified product. Several different recombinant
phages were purified and partially characterized. Restriction enzyme
analysis showed that conserved restriction sites in the pol gene were
found in the different clones. (Full text available from University
Microfilms International, Ann Arbor, MI, as Order No. AAD93-18789)
DE Amino Acid Sequence Animal Antibodies, Monoclonal/DIAGNOSTIC USE
*Antigenic Determinants Antigens, Neoplasm/*ANALYSIS Cell
Transformation, Neoplastic/GENETICS/IMMUNOLOGY Dogs Gene Amplification
Lymphocytes/DRUG EFFECTS/IMMUNOLOGY Lymphoma/*CHEMISTRY/DIAGNOSIS
Mitogens/PHARMACOLOGY Polymerase Chain Reaction
Retroviridae/GENETICS/*ISOLATION & PURIF Retroviruses Type D,
Simian/*GENETICS/IMMUNOLOGY Sequence Homology, Amino Acid THESIS
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).