Biomechanical and biochemical regulation of cathepsin K expression in endothelial cells converge at AP-1 and NF-κB

Philip M. Keegan, Suhaas Anbazhakan, Baolin Kang, Betty S. Pace, Manu O. Platt

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Cathepsins K and V are powerful elastases elevated in endothelial cells by tumor necrosis factor-α (TNFα) stimulation and disturbed blood flow both of which contribute to inflammation-mediated arterial remodeling. However, mechanisms behind endothelial cell integration of biochemical and biomechanical cues to regulate cathepsin production are not known. To distinguish these mechanisms, human aortic endothelial cells (HAECs) were stimulated with TNFα and exposed to pro-remodeling or vasoprotective shear stress profiles. TNFα upregulated cathepsin K via JNK/c-jun activation, but vasoprotective shear stress inhibited TNFα-stimulated cathepsin K expression. JNK/c-jun were still phosphorylated, but cathepsin K mRNA levels were significantly reduced to almost null indicating separate biomechanical regulation of cathepsin K by shear stress separate from biochemical stimulation. Treatment with Bay 11-7082, an inhibitor of IκBα phosphorylation, was sufficient to block induction of cathepsin K by both pro-remodeling shear stress and TNFα, implicating NF-κB as the biomechanical regulator, and its protein levels were reduced in HAECs by vasoprotective shear stress. In conclusion, NF-κB and AP-1 activation were necessary to activate cathepsin K expression in endothelial cells, highlighting integration of biochemical and biomechanical stimuli to control cathepsins K and V, powerful elastases implicated for arterial remodeling due to chronic inflammation and disturbed blood flow.

Original languageEnglish (US)
Pages (from-to)459-468
Number of pages10
JournalBiological Chemistry
Volume397
Issue number5
DOIs
StatePublished - May 1 2016

Fingerprint

Cathepsin K
Endothelial cells
Transcription Factor AP-1
Endothelial Cells
Shear stress
Tumor Necrosis Factor-alpha
Pancreatic Elastase
Blood
Chemical activation
Cathepsins
Arteritis
Phosphorylation
Cues
Inflammation
Messenger RNA

Keywords

  • TNF-α
  • proteases
  • shear stress
  • sickle cell disease

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Clinical Biochemistry

Cite this

Biomechanical and biochemical regulation of cathepsin K expression in endothelial cells converge at AP-1 and NF-κB. / Keegan, Philip M.; Anbazhakan, Suhaas; Kang, Baolin; Pace, Betty S.; Platt, Manu O.

In: Biological Chemistry, Vol. 397, No. 5, 01.05.2016, p. 459-468.

Research output: Contribution to journalArticle

Keegan, Philip M. ; Anbazhakan, Suhaas ; Kang, Baolin ; Pace, Betty S. ; Platt, Manu O. / Biomechanical and biochemical regulation of cathepsin K expression in endothelial cells converge at AP-1 and NF-κB. In: Biological Chemistry. 2016 ; Vol. 397, No. 5. pp. 459-468.
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