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WHIM Syndrome-linked CXCR4 mutations drive osteoporosis
Adrienne Anginot1,2,3, Julie Nguyen2,4, Zeina Abou Nader1,2,3
1Université Paris Cité, Institut de Recherche Saint-Louis, INSERM U1160, Paris, France.
Nature Communications
|April 12, 2023
Summary
WHIM Syndrome, a rare immunodeficiency, can cause bone loss and osteoporosis due to CXCR4 mutations. Blocking CXCR4 with AMD3100 restored bone health in a mouse model, highlighting its role in bone formation.
Area of Science:
- Immunology
- Skeletal Biology
- Genetics
Background:
- WHIM Syndrome is a primary immunodeficiency characterized by frequent infections.
- It stems from gain-of-function mutations in the CXCR4 receptor.
- Bone density loss and skeletal defects have been anecdotally reported in WHIM patients.
Purpose of the Study:
- To investigate the impact of WHIM Syndrome on bone health.
- To elucidate the role of CXCR4 signaling in skeletal homeostasis.
- To explore therapeutic strategies targeting CXCR4 for bone defects.
Main Methods:
- Analysis of bone mineral density in WHIM patients.
- Generation and characterization of a WHIM mouse model.
- In vitro and in vivo studies using primary cells and pharmacological interventions (AMD3100).
Main Results:
- 25% of WHIM patients exhibited decreased bone mineral density.
- WHIM mice displayed bone defects and osteoporosis.
- Mutant mice showed reduced osteoprogenitor cells and increased osteoclasts.
- Impaired CXCR4 desensitization disrupted osteogenic differentiation and promoted osteoclastogenesis.
- AMD3100 treatment normalized osteogenic cell fate and reversed bone loss in mice.
Conclusions:
- Gain-of-function CXCR4 mutations contribute to bone loss in WHIM Syndrome.
- Proper CXCR4 desensitization is crucial for skeletal stromal/stem cell osteogenic specification.
- Targeting CXCR4 with antagonists may offer a therapeutic approach for bone complications in WHIM Syndrome.
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