Prognostic values of alpha2-macroglobulin, fibrinogen and albumin in regards to mortality and frailty in old rats.
The study aimed to determine if acute phase proteins (APP) are markers of frailty in old rats. We evaluated in male Wistar rats at 96 weeks of age (n=72) whether single measurements of alpha(2)-macroglobulin, fibrinogen and albumin are predictive of mortality, body weight loss and inflammatory status during a 10-week follow-up period. Rats were clustered depending on levels of these APP at baseline. Rats with extremely high levels of alpha(2)-macroglobulin or fibrinogen (upper quartiles), or extremely low level of albumin (lower quartile), had an 11.6, 8.1 and 5.3-fold higher risk of mortality, respectively, than other rats. Body weight loss was negatively correlated with alpha(2)-macroglobulin, a trend was observed with fibrinogen (P=0.08) but not with albumin. Rats with fibrinogen levels >4.0 g/L or alpha(2)-macroglobulin levels >91 mg/L (respective top halves) at 96 weeks of age had higher levels of alpha(2)-macroglobulin and fibrinogen and lower levels of albumin throughout the follow-up period and higher levels of sTNFR-1 and lipopolysaccharide-binding protein at 106 weeks of age. Highest levels of alpha(2)-macroglobulin, fibrinogen and lowest albumin were predictive of mortality, whereas moderate levels of alpha(2)-macroglobulin and fibrinogen were, according to body weight loss and inflammatory status, markers of frailty in old rats.
Mayot
Gilles
G
INRA, Centre Clermont-Ferrand Theix, UMR 1019 Unité de Nutrition Humaine, F-63122 Saint-Genès-Champanelle, France.
Vidal
Karine
K
Martin
Jean-François
JF
Breuillé
Denis
D
Blum
Stephanie
S
Obled
Christiane
C
Papet
Isabelle
I
D000209:Acute-Phase Proteins / Q000378:metabolism; D000375:Aging / Q000097:blood* / Q000473:pathology; D000818:Animals; D002352:Carrier Proteins / Q000097:blood; D005340:Fibrinogen / Q000378:metabolism*; D007249:Inflammation / Q000097:blood; D018836:Inflammation Mediators / Q000097:blood; D008136:Longevity / Q000502:physiology; D008297:Male; D008562:Membrane Glycoproteins / Q000097:blood; D011379:Prognosis; D051381:Rats; D017208:Rats, Wistar; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000097:blood; D012709:Serum Albumin / Q000378:metabolism*; D015431:Weight Loss / Q000502:physiology; D000511:alpha-Macroglobulins / Q000378:metabolism*; D000099231:Lipopolysaccharide-Binding Protein
D000209:Acute-Phase Proteins; D002352:Carrier Proteins; D005340:Fibrinogen; D018836:Inflammation Mediators; D008562:Membrane Glycoproteins; D047888:Receptors, Tumor Necrosis Factor, Type I; D012709:Serum Albumin; D000511:alpha-Macroglobulins; D000099231:Lipopolysaccharide-Binding Protein; C506237:Tnfrsf1a protein, rat