Sexual dimorphic impact of adult-onset somatopause on life span and age-induced osteoarthritis.
Sher Bahadur PoudelManisha DixitGozde YildirimJose Cordoba-ChaconManuel D GaheteIkeno YujiThorsten KirschRhonda D KinemanShoshana YakarPublished in: Aging cell (2021)
Osteoarthritis (OA), the most prevalent joint disease, is a major cause of disability worldwide. Growth hormone (GH) has been suggested to play significant roles in maintaining articular chondrocyte function and ultimately articular cartilage (AC) homeostasis. In humans, the age-associated decline in GH levels was hypothesized to play a role in the etiology of OA. We studied the impact of adult-onset isolated GH deficiency (AOiGHD) on the life span and skeletal integrity including the AC, in 23- to 30-month-old male and female mice on C57/BL6 genetic background. Reductions in GH during adulthood were associated with extended life span and reductions in body temperature in female mice only. However, end-of-life pathology revealed high levels of lymphomas in both sexes, independent of GH status. Skeletal characterization revealed increases in OA severity in AOiGHD mice, evidenced by AC degradation in both femur and tibia, and significantly increased osteophyte formation in AOiGHD females. AOiGHD males showed significant increases in the thickness of the synovial lining cell layer that was associated with increased markers of inflammation (IL-6, iNOS). Furthermore, male AOiGHD showed significant increases in matrix metalloproteinase-13 (MMP-13), p16, and β-galactosidase immunoreactivity in the AC as compared to controls, indicating increased cell senescence. In conclusion, while the life span of AOiGHD females increased, their health span was compromised by high-grade lymphomas and the development of severe OA. In contrast, AOiGHD males, which did not show extended life span, showed an overall low grade of lymphomas but exhibited significantly decreased health span, evidenced by increased OA severity.
Keyphrases
- growth hormone
- low grade
- high grade
- knee osteoarthritis
- single cell
- healthcare
- public health
- mental health
- rheumatoid arthritis
- magnetic resonance
- high fat diet induced
- multiple sclerosis
- nitric oxide
- stem cells
- magnetic resonance imaging
- computed tomography
- dna damage
- insulin resistance
- adipose tissue
- early onset
- mesenchymal stem cells
- optical coherence tomography
- bone marrow
- social media
- genome wide
- wild type
- replacement therapy