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Related Concept Videos

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
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Updated: Jan 27, 2026

Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
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Poly(ADP-ribose) polymerase 1 accelerates vascular calcification by upregulating Runx2.

Cheng Wang1,2,3, Wenjing Xu1,2, Jie An1,2

  • 1Clinical Center for Human Genomic Research, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.

Nature Communications
|March 15, 2019
PubMed
Summary
This summary is machine-generated.

Poly(ADP-ribose) polymerase 1 (PARP1) counteracts vascular calcification by regulating smooth muscle cell transdifferentiation and mineralization. Targeting PARP1 may offer a therapeutic strategy for treating vascular calcification.

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Area of Science:

  • Cardiovascular Biology
  • Renal Disease Pathophysiology
  • Molecular Medicine

Background:

  • Vascular calcification is common in end-stage renal disease and linked to poor outcomes.
  • Poly(ADP-ribose) polymerase 1 (PARP1) inhibition shows protective effects in various disease models.

Purpose of the Study:

  • To investigate the role of PARP1 in vascular calcification associated with chronic renal failure.
  • To elucidate the molecular mechanisms by which PARP1 influences vascular smooth muscle cell phenotype and mineralization.

Main Methods:

  • Assessed PARP activity in human and rat arteries and in vitro vascular smooth muscle cells (VSMCs).
  • Examined the effects of PARP1 deficiency and overexpression on VSMC transdifferentiation and calcification.
  • Investigated the regulatory pathway involving PARP1, IL-6/STAT3, miRNA-204, and Runx2.

Main Results:

  • PARP activity was elevated in chronic renal failure patients, uraemic rats, and calcified VSMCs.
  • PARP1 deficiency inhibited, while overexpression exacerbated, VSMC osteogenic transdifferentiation and calcification.
  • PARP1 promotes Runx2 expression, partly by suppressing miRNA-204 via the IL-6/STAT3 pathway.

Conclusions:

  • PARP1 plays a protective role against vascular calcification.
  • The PARP1-miRNA-204-Runx2 axis is a key regulator of vascular smooth muscle cell calcification.
  • Modulating PARP1 activity presents a potential therapeutic avenue for vascular calcification.