Can connexin43 work inside the nucleus?
Cx43 sits at the nuclear envelope, enters via Importin-β, forms active nuclear channels in HEK293 cells and cardiomyocytes, and can change gene expression during myogenic differentiation.
Source
Cx43 can form functional channels at the nuclear envelope and modulate gene expression in cardiac cells
Study at a glance
- Design
- Animal / in-vitro — Cell, tissue, and patch-clamp work showing Cx43 at the nuclear envelope of cultured cells and cardiac tissue
- N
- N=1 · Mechanistic study in HEK293 Cx43+ cells, adult primary cardiomyocytes, cardiomyoblasts, and cardiac tissue (not a clinical cohort)
- Population
- Cultured HEK293 cells, adult primary cardiomyocytes, cardiomyoblasts, and cardiac tissue
- Outcome
- Nuclear-envelope localization of Cx43, Importin-β-dependent translocation, nuclear channels, and transcriptome effects
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What they did
Used biochemistry, super-resolution and immunogold EM, Importin-β dependence tests, transcriptome readouts, and nuclear patch-clamp in HEK293 cells and adult primary cardiomyocytes.
What they found
Full-length Cx43 localizes to the nuclear envelope in multiple cell types and cardiac tissue. Nuclear entry needs Importin-β. Patch-clamp showed active nuclear-envelope channels, consistent with small-molecule nucleocytoplasmic shuttling. Nuclear Cx43 accumulates during cardiomyoblast differentiation.
The limits
What it doesn't show
This is not a patient trial of a Cx43 drug; nuclear channel function in vivo human heart disease remains to be proven.
Key terms
- Connexin43 (Cx43)
- Gap-junction protein increasingly recognized for non-canonical nuclear roles.
- Nuclear envelope
- Double membrane around the nucleus where Cx43 was localized.
- Importin-β
- Nuclear-import factor required for Cx43 translocation to the nucleus.
- Patch-clamp
- Electrophysiology showing Cx43 can form active nuclear-envelope channels.
- HEK293 Cx43+
- Human cell line engineered for stable rat Cx43 expression.
- Myogenic differentiation
- Cardiomyoblast maturation during which nuclear Cx43 accumulates.
Flashcards
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Quiz yourself
Nuclear Cx43 was found at the:
Common questions
Where is nuclear Cx43?
At the nuclear envelope of cultured cells and cardiac tissue.
How does it get there?
Translocation relies on Importin-β.
Does it form channels?
Yes—patch-clamp in HEK293 and adult primary cardiomyocytes.
Why might that matter in heart?
Nuclear Cx43 may modulate genes during myogenic differentiation.
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