home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9602.ZIP
/
M9620235.TXT
< prev
next >
Wrap
Text File
|
1996-02-26
|
3KB
|
46 lines
Document 0235
DOCN M9620235
TI Mycoplasmas and oncogenesis: persistent infection and multistage
malignant transformation.
DT 9602
AU Tsai S; Wear DJ; Shih JW; Lo SC; American Registry of Pathology,
Department of Infectious and; Parasitic Disease Pathology, Armed Forces
Institute of Pathology,; Washington, DC 20306-6000, USA.
SO Proc Natl Acad Sci U S A. 1995 Oct 24;92(22):10197-201. Unique
Identifier : AIDSLINE MED/96036051
AB Oncogenic potential of human mycoplasmas was studied using cultured
mouse embryo cells, C3H/10T1/2 (C3H). Mycoplasma fermentans and
Mycoplasma penetrans, mycoplasmas found in unusually high frequencies
among patients with AIDS, were examined. Instead of acute
transformation, a multistage process in promotion and progression of
malignant cell transformation with long latency was noted; after 6
passages (1 wk per passage) of persistent infection with M. fermentans,
C3H cells exhibited phenotypic changes with malignant characteristics
that became progressively more prominent with further prolonged
infection. Up to at least the 11th passage, all malignant changes were
reversible if mycoplasmas were eradicated by antibiotic treatment.
Further persistent infection with the mycoplasmas until 18 passages
resulted in an irreversible form of transformation that included the
ability to form tumors in animals and high soft agar cloning efficiency.
Whereas chromosomal loss and translocational changes in C3H cells
infected by either mycoplasma during the reversible stage were not
prominent, the onset of the irreversible phase of transformation
coincided with such karyotypic alteration. Genetic instability--i.e.,
prominent chromosomal alteration of permanently transformed cells--was
most likely caused by mutation of a gene(s) responsible for fidelity of
DNA replication or repair. Once induced, chromosomal alterations
continued to accumulate both in cultured cells and in animals without
the continued presence of the transforming microbes. Mycoplasma-mediated
multistage oncogenesis exhibited here shares many characteristics found
in the development of human cancer.
DE Animal AIDS-Related Opportunistic Infections/*MICROBIOLOGY Cell
Division Cell Line *Cell Transformation, Neoplastic Cells, Cultured
Chromosome Deletion Chromosome Mapping Clone Cells Embryo Human
Karyotyping Mice Mice, Inbred C3H Mice, Nude *Mycoplasma fermentans
*Mycoplasma penetrans Mycoplasma Infections/*PHYSIOPATHOLOGY Support,
U.S. Gov't, P.H.S. Translocation (Genetics) JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).