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M9610666.TXT
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1996-01-30
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Document 0666
DOCN M9610666
TI Alterations in cell-cell communication in human papillomavirus type 16
(HPV16) transformed rat myoblasts.
DT 9601
AU Ennaji MM; Schwartz JL; Mealing G; Belbaraka L; Parker C; Parentaux M;
Jouishomme H; Arella M; Whitfield JF; Phipps J; National Research
Council of Canada, Steacie Institute for; Molecular Sciences, Ottawa,
Ontario.
SO Cell Mol Biol (Noisy-le-grand). 1995 Jun;41(4):481-98. Unique Identifier
: AIDSLINE MED/96057185
AB A reduction of gap-junctional intercellular communication (GJIC) often
accompanies neoplastic transformation. The present work demonstrates
that transformation by the oncogenic human DNA virus, human papilloma
virus 16(HPV16), also reduces GJIC between L6 rat myoblasts. HPVs are
associated with anogenital cancers, the incidence of which is increasing
in HIV positive patients of both sexes. Using videofluorescence imaging
of Fura-2 loaded cells a lack of GJIC between transformed HPV16-L6 cells
was first indicated by uncoordinated brief [Ca2+]i spikes in clusters of
DMSO-treated HPV16-L6 cells instead of the synchronous, sustained
[Ca2+]i surges in clusters of DMSO-treated L6 cells. Reduced GJIC
between HPV16-L6 cells was demonstrated directly by a much reduced
transfer of lucifer yellow dye from HPV16-L6 cells, which had been
loaded with the dye through electroporation with an EPIZAP II in situ
electroporator, to neighbouring nonelectroporated HPV16-L6 cells. One
reason for this reduced GJIC between HPV16-L6 cells could have been
their dramatically enhanced activity of membrane-associated PKC which is
known to phosphorylate connexins and down-regulate gap junctions.
However, the main reason was the viral-induced inhibition of the
expression of a major gap junction component, Cx43 (Connexin 43), in the
transformed myoblasts.
DE Animal Calcium/METABOLISM *Cell Communication Cell Line, Transformed
Cell Transformation, Viral Connexin 43/BIOSYNTHESIS Human
Intercellular Junctions/METABOLISM/*VIROLOGY Muscle,
Skeletal/*CYTOLOGY/METABOLISM/VIROLOGY *Papillomavirus, Human
Phosphorylation Protein Kinase C/METABOLISM Rats Support, Non-U.S.
Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).