BACKGROUND: Inflammation and malnutrition are common in chronic kidney disease (CKD) patients, and plasma concentrations of free amino acids (AAs) in these patients are often abnormal. Malnutrition contributes to alterations in AA concentrations. OBJECTIVE: The objective was to study the effects of inflammation on plasma AA concentrations. DESIGN: Concentrations of plasma AAs, serum albumin, and several inflammatory markers were analyzed in 200 fasting, nondiabetic CKD patients who were close to the start of renal replacement therapy. The nutritional status of these patients was assessed by a subjective global assessment. RESULTS: The patients with inflammation [C-reactive protein (CRP) concentrations >10 mg/L] or malnutrition had lower AA concentrations than did the patients with no inflammation or malnutrition. The presence of both inflammation and malnutrition was associated with more marked reductions in AA concentrations than was malnutrition alone. Significant inverse correlations were observed between the plasma concentrations of most of the essential and nonessential AAs and inflammatory markers, whereas serum albumin concentrations were positively correlated with several AA concentrations. A stepwise multivariate regression analysis showed that serum CRP concentrations were independently associated with low concentrations of the sums of both nonessential AAs and all AAs. An analysis of all-cause mortality with a Kaplan-Meier test showed that the patients with higher AA concentrations had significantly better survival than did the patients with lower AA concentrations. CONCLUSIONS: Plasma AA concentrations are low in CKD patients with inflammation and are inversely correlated with concentrations of inflammatory markers. Although inflammation and malnutrition are closely related, CRP concentrations were independently associated with low concentrations of the sums of both nonessential AAs and all AAs, which suggests an independent role of inflammation as a cause of low plasma AA concentrations in CKD patients.
BACKGROUND:Inflammation and malnutrition are common in chronic kidney disease (CKD) patients, and plasma concentrations of free amino acids (AAs) in these patients are often abnormal. Malnutrition contributes to alterations in AA concentrations. OBJECTIVE: The objective was to study the effects of inflammation on plasma AA concentrations. DESIGN: Concentrations of plasma AAs, serum albumin, and several inflammatory markers were analyzed in 200 fasting, nondiabetic CKDpatients who were close to the start of renal replacement therapy. The nutritional status of these patients was assessed by a subjective global assessment. RESULTS: The patients with inflammation [C-reactive protein (CRP) concentrations >10 mg/L] or malnutrition had lower AA concentrations than did the patients with no inflammation or malnutrition. The presence of both inflammation and malnutrition was associated with more marked reductions in AA concentrations than was malnutrition alone. Significant inverse correlations were observed between the plasma concentrations of most of the essential and nonessential AAs and inflammatory markers, whereas serum albumin concentrations were positively correlated with several AA concentrations. A stepwise multivariate regression analysis showed that serum CRP concentrations were independently associated with low concentrations of the sums of both nonessential AAs and all AAs. An analysis of all-cause mortality with a Kaplan-Meier test showed that the patients with higher AA concentrations had significantly better survival than did the patients with lower AA concentrations. CONCLUSIONS: Plasma AA concentrations are low in CKDpatients with inflammation and are inversely correlated with concentrations of inflammatory markers. Although inflammation and malnutrition are closely related, CRP concentrations were independently associated with low concentrations of the sums of both nonessential AAs and all AAs, which suggests an independent role of inflammation as a cause of low plasma AA concentrations in CKDpatients.
Authors: Benedetta Bartali; Edward A Frongillo; Martha H Stipanuk; Stefania Bandinelli; Simonetta Salvini; Domenico Palli; Jose A Morais; Stefano Volpato; Jack M Guralnik; Luigi Ferrucci Journal: J Am Geriatr Soc Date: 2012-01-27 Impact factor: 5.562
Authors: Fatina I Fadel; Manal F Elshamaa; Rascha G Essam; Eman A Elghoroury; Gamila S M El-Saeed; Safinaz E El-Toukhy; Mona Hamed Ibrahim Journal: Int J Biomed Sci Date: 2014-03
Authors: Peter Stenvinkel; Ole Fröbert; Björn Anderstam; Fredrik Palm; Monica Eriksson; Ann-Christin Bragfors-Helin; Abdul Rashid Qureshi; Tobias Larsson; Andrea Friebe; Andreas Zedrosser; Johan Josefsson; My Svensson; Berolla Sahdo; Lise Bankir; Richard J Johnson Journal: PLoS One Date: 2013-09-09 Impact factor: 3.240