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Dominant negative effect of connexin33 on gap junctional communication is mediated by connexin43 sequestration. | LitMetric

AI Article Synopsis

  • Gap junctional intercellular communication regulates cell growth and differentiation, with connexin33 inhibiting this communication when injected into Xenopus oocytes.
  • Connexin33 is exclusively expressed in the seminiferous tubules of the testis and is unphosphorylated, unlike other connexins.
  • It physically interacts with connexin43, sequestering the complex in early endosomes, leading to impaired communication between cells and suggesting connexin33 may play a role in regulating germ cell proliferation.

Article Abstract

Gap junctional intercellular communication is involved in the control of cell proliferation and differentiation. Connexin33, a member of the multi-gene family of gap junction proteins, exerts an inhibitory effect on intercellular communication when injected into Xenopus oocytes. However, the molecular mechanisms involved remain to be elucidated. Our results show that connexin33 was only expressed within the seminiferous tubules in the testis. In contrast to the majority of connexins, connexin33 was unphosphorylated. Immunoprecipitation experiments revealed that connexin33 physically interacted with connexin43, mainly with the phosphorylated P1 isoform of connexin43 but not with connexin26 and connexin32, two other connexins expressed in the tubular compartment. In Sertoli cells and COS-7 cells, connexin43 was located at the plasma membrane, whereas in connexin33 transfected cells, the specific association of connexin33/43 was sequestered in the intracellular compartment. High-resolution fluorescent deconvolution microscopy indicated that the connexin33/43 complex was mainly found within early endosomes. Sequestration of connexin33/43 complex was associated with a complete inhibition of the gap junctional coupling between adjacent cells. These findings provide the first evidence of a new mechanistic model by which a native connexin, exerting a dominant negative effect, can inhibit gap junctional intercellular communication. In the testis, connexin33 could exert a specific role on germ cell proliferation by suppressing the regulatory effect of connexin43.

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http://dx.doi.org/10.1242/jcs.01335DOI Listing

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