Cited by 46Bone Metabolism and DiseasesBone Tumor Diagnosis and TreatmentsDermatological and Skeletal Disorders

NOTCH2 Hajdu-Cheney Mutations Escape SCFFBW7-Dependent Proteolysis to Promote Osteoporosis

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Fukushima, Hidefumi, Shimizu, Kouhei, Watahiki, Asami, Hoshikawa, Seira, Kosho, Tomoki, Oba, Daiju, Sakano, Seiji, Arakaki, Makiko +11 more·2017·Molecular Cell

Abstract

Hajdu-Cheney syndrome (HCS), a rare autosomal disorder caused by heterozygous mutations in NOTCH2, is clinically characterized by acro-osteolysis, severe osteoporosis, short stature, neurological symptoms, cardiovascular defects, and polycystic kidneys. Recent studies identified that aberrant NOTCH2 signaling and consequent osteoclast hyperactivity are closely associated with the bone-related disorder pathogenesis, but the exact molecular mechanisms remain unclear. Here, we demonstrate that sustained osteoclast activity is largely due to accumulation of NOTCH2 carrying a truncated C terminus that escapes FBW7-mediated ubiquitination and degradation. Mice with osteoclast-specific Fbw7 ablation revealed osteoporotic phenotypes reminiscent of HCS, due to elevated Notch2 signaling. Importantly, administration of Notch inhibitors in Fbw7 conditional knockout mice alleviated progressive bone resorption. These findings highlight the molecular basis of HCS pathogenesis and provide clinical insights into potential targeted therapeutic strategies for skeletal disorders associated with the aberrant FBW7/NOTCH2 pathway as observed in patients with HCS.

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Authors
Fukushima, H., Shimizu, K., Watahiki, A., Hoshikawa, S., Kosho, T., Oba, D., Sakano, S., Arakaki, M., Yamada, A., Nagashima, K., Okabe, K., Fukumoto, S., Jimi, E., Bigas, A., Nakayama, K. I., Nakayama, K., Aoki, Y., Wei, W., & Inuzuka, H.
Affiliations
  • Tohoku University (JP)
  • Beth Israel Deaconess Medical Center (US)
  • Shinshu University (JP)
  • Asahi Kasei (Japan) (JP)
  • Fukuoka Dental College (JP)
  • Kyushu University (JP)
  • Hospital del Mar Research Institute (ES)
Corresponding author
  • Fukushima, Hidefumi
  • Wei, Wenyi
  • Inuzuka, Hiroyuki
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2017-11
Volume
68
Issue
4
Pages
645-658.e5
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2770455327
Cited by
46
References
51
Citations by year
2026: 6 · 2025: 6 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 12 · 2019: 7 · 2018: 4
FWCI
2.57
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • JSPS Kakenhi (17H04396, 26462829, 26253092, 16H05548, 16H05529, 16K15811)
  • NIH (GM094777, CA177910)
  • American Cancer Society
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Rheumatology › Bone Tumor Diagnosis and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Dermatological and Skeletal Disorders
Keywords
Hajdu-Cheney syndrome, NOTCH2 mutation, FBXW7, proteasomal degradation, ubiquitination, bone resorption, osteoporosis, acro-osteolysis, Notch signaling, Notch inhibitors, bone disease
MeSH terms
F-Box-WD Repeat-Containing Protein 7, Animals, Cell Line, Mutation, Osteoporosis, Mice, Knockout, Hajdu-Cheney Syndrome, Receptor, Notch2, Ubiquitination, Proteolysis

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