Age- and gender-dependent changes in circulating concentrations of tumor necrosis factor-α, soluble tumor necrosis factor receptor-1 and sulfated glycosaminoglycan in healthy people.
BACKGROUND
In this study, the effect of gender and physiological ageing on circulating concentrations of plasma sulfated glycosaminoglycans (sGAG) as well as molecules involved in pro- (tumor necrosis factor-α; TNF-α) and anti-inflammatory responses (soluble tumor necrosis factor receptor-1, sTNF-RI) were assessed. The relationships between sGAG and molecules involved in age-dependent extracellular matrix (ECM) remodeling during physiological ageing were also investigated.


METHODS
Circulating TNF-α and sTNF-RI were measured in 91 healthy volunteers using enzyme-linked immunosorbent assays. sGAG were quantified using an Alcian blue-binding assay.


RESULTS
A linear age-related decline in plasma sGAG was found during the first five decades of life (r=-0.61, p<0.05), followed by an increase occurring only in females (r=0.46, p<0.05). Circulating TNF-α concentrations were inversely correlated with age (r=-0.24, p<0.05) over the lifetime. For TNF-α, the observed changes were gender specific. Serum sTNF-RI concentrations were not affected by age in either men or women. A significant positive correlation was found between the concentrations of TNF-α and both sGAG (r=0.22, p<0.05) and sTNF-RI (r=0.21, p<0.05).


CONCLUSIONS
Our data demonstrate that physiological ageing is associated with ECM remodeling, reflected by plasma sGAGs concentrations. Changes in the ECM metabolism during the ageing process were influenced by circulating TNF-α. Furthermore, serum concentrations of biomolecules involved in pro- and anti-inflammatory responses are not increased in healthy elderly subjects.
Komosinska-Vassev
Katarzyna
K
Department of Clinical Chemistry and Laboratory Diagnostics, Medical University of Silesia, Sosnowiec, Poland. kvassev@sum.edu.pl
Olczyk
Pawel
P
Winsz-Szczotka
Katarzyna
K
Klimek
Katarzyna
K
Olczyk
Krystyna
K
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006025:Glycosaminoglycans / Q000097:blood*; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000097:blood*; D012016:Reference Values; D012737:Sex Factors; D014409:Tumor Necrosis Factor-alpha / Q000097:blood*; D055815:Young Adult
D006025:Glycosaminoglycans; D047888:Receptors, Tumor Necrosis Factor, Type I; D014409:Tumor Necrosis Factor-alpha; C013786:A73025