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Alterations in cell-cell communication in human papillomavirus type 16 (HPV16) transformed rat myoblasts

From National Research Council Canada

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Affiliation
  1. National Research Council Canada. NRC Institute for Biological Sciences
  2. National Research Council Canada. NRC Biotechnology Research Institute
  3. National Research Council Canada. NRC Steacie Institute for Molecular Sciences
FormatText, Article
Subjectenvironmental
Abstract
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.
Publication date
In
  • Cellular and Molecular Biology 41, no. 4 (1995): 481–498.
LanguageEnglish
NRC numberENNAJI1995
34581
NPARC number3539744
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Record identifier5c4feb33-dd33-4331-b08e-e54b06d3c348
Record created2009-03-01
Record modified2020-04-29
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