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Updated: Dec 27, 2025

A Guide to Production, Crystallization, and Structure Determination of Human IKK1/α
11:27

A Guide to Production, Crystallization, and Structure Determination of Human IKK1/α

Published on: November 2, 2018

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Both JNK1 and JNK2 Are Indispensable for Sensitized Extracellular Matrix Mineralization in IKKβ-Deficient Osteoblasts

Qianyun Hao1, Zhuangzhuang Liu2, Liaoxun Lu2

  • 1Department of Nephrology, Peking University People's Hospital, Beijing, China.

Frontiers in Endocrinology
|March 3, 2020
PubMed

Insights

Inhibiting IKKβ boosts bone mineralization by activating JNK signaling. Blocking JNK1/JNK2 in IKKβ-deficient cells restores normal mineralization, revealing a new pathway for treating bone diseases.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Extracellular matrix mineralization is vital for bone formation and its disruption causes osteoporosis and vascular calcification.
  • IKK/NF-κB pathway activation inhibits osteoblast differentiation and mineralization, but mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the mechanisms by which IKK/NF-κB signaling affects osteoblast differentiation and extracellular matrix mineralization.
  • To investigate the role of JNK signaling in IKKβ-mediated regulation of osteogenesis.

Main Methods:

  • CRISPR/Cas9 gene editing to inactivate IKKβ in preosteoblast cells.
  • Analysis of extracellular matrix mineralization and JNK/c-Jun phosphorylation in knockout cell lines.
  • Transcriptomic analysis of IKKβ-deficient cells with or without JNK1/JNK2.

Main Results:

  • IKKβ inactivation in preosteoblasts significantly increased extracellular matrix mineralization, correlated with elevated JNK phosphorylation.
  • Simultaneous deletion of IKKβ and either MAPK8 (JNK1) or MAPK9 (JNK2) abolished the enhanced mineralization.
  • JNK1 or JNK2 deficiency dampened c-Jun phosphorylation and normalized transcriptomic changes in IKKβ-deficient cells.

Conclusions:

  • JNK1 and JNK2 are essential for the enhanced osteoblast differentiation and mineralization observed in IKKβ-deficient cells.
  • Targeting JNK signaling offers a potential therapeutic strategy for restoring extracellular matrix mineralization homeostasis in bone diseases.
Keywords:
CRISPR/Cas9IKKβJNK1JNK2NF-κBosteoblasts

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