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Involvement of Skeletal Muscle Fibrocytes in sarcOpenia in Patients With Chronic ObstRuctive Pulmonary Disease
Sponsor: University Hospital, Bordeaux
Summary
Chronic obstructive pulmonary disease (COPD) is presently the third leading cause of death worldwide and is characterized by irreversible airflow limitation diagnosed by spirometry. COPD is currently considered as a systemic disease with predominantly respiratory involvement, associated with numerous comorbidities. Among these, muscle wasting, present in about one third of patients, is associated with a higher mortality (up to 10-fold, irrespective of the severity of the obstruction). Muscle wasting is classically characterized by a decrease in muscle strength and volume (sarcopenia), which can be defined by a decrease in the muscle mass measured by dual X-ray absorptiometry: Appendicular Skeletal Muscle Mass or ASM / height \< 7.0 kg/m2 in men and 5.5 kg/m2 in women. However, sarcopenia is largely underestimated in current clinical practice. Moreover, there is no specific treatment: only exercise training as part of respiratory rehabilitation has shown some efficiency. The underlying pathophysiological mechanisms are indeed poorly characterized. Fibrocytes, cells derived from blood monocytes and able to migrate to different organs in order to play pro-fibrotic or pro-inflammatory roles, play a key role in bronchial obstruction. They are recruited in the blood of COPD patients during an acute exacerbation according to a CXCL12/CXCR4 chemotactic axis. Their role in COPD sarcopenia is currently unknown, but recent data show that they are involved in a mouse model of muscular dystrophy. The hypothesis is that fibrocytes are involved in COPD sarcopenia.
Key Details
Gender
All
Age Range
40 Years - Any
Study Type
INTERVENTIONAL
Enrollment
22
Start Date
2022-11-29
Completion Date
2025-11-21
Last Updated
2026-06-01
Healthy Volunteers
No
Conditions
Interventions
quadricipital biopsy
The primary endpoint will be evaluated by histological examination only. The technique of percutaneous biopsy using the modified Bergström needle technique is currently considered the best alternative in the context of research, as it allows sufficient material to be obtained for various analyses and is much less invasive than the reference technique (surgical biopsy). Indeed, unlike surgical biopsy which requires an operating room and is a relatively heavy procedure (two suture planes, skin incision of several centimeters, resting for 48 hours after the procedure...), percutaneous biopsy by the modified Bergström technique can be performed in a consultation room, requires only one stitch, and allows resumption of walking 30 minutes after the end of the procedure.
Locations (1)
Hôpital Haut-Lévêque - CHU de Bordeaux
Pessac, France