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Serum alpha 2-macroglobulin in haemodialysis patients: baseline and kinetic studies
Abstract:
The pathogenesis of dialysis related amyloidosis remains unresolved despite the identification of beta 2-microglobulin (beta 2M) as the major protein constituent, as well as other proteins being present in the deposits. Among the latter we have assessed the serum concentrations of alpha 2-macroglobulin (alpha 2M) both in the baseline stage and during the haemodialysis (HD) procedure. We have also assessed the influence of the membrane on alpha 2M kinetics. Fifteen HD patients with histologically proven dialysis-related amyloidosis (DRA group) and 15 HD patients clinically and radiologically considered dialysis-related amyloidosis free (control group) were included in the baseline study. Blood was sampled the day before the second dialysis of the week and alpha 2M, beta 2M and alpha 1 antitrypsin were determined along with the routine biological analysis of these patients. Serum alpha 2M was greater in dialysis-related amyloidosis than in control patients (t = 2.35; P < 0.026). Serum beta 2M was similar in both groups. The serum alpha 2M and beta 2M correlated in patients with dialysis-related amyloidosis (r = 0.64; P < 0.01), while no correlation was found in controls (r = 0.17; NS). Stepwise analysis taking the presence of dialysis-related amyloidosis as the dependent variable retained the serum alpha 2M concentration as the first variable in the model (F = 4.4; partial r = 0.38; P < 0.046).(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Serum alpha 2-macroglobulin (α2M) is elevated in dialysis-related amyloidosis (DRA) patients compared to controls. Elevated α2M, not beta 2-microglobulin (β2M), is linked to DRA pathogenesis.
Area of Science:
- Nephrology
- Biochemistry
- Pathology
Background:
- Dialysis-related amyloidosis (DRA) pathogenesis is not fully understood.
- Beta 2-microglobulin (β2M) is a known component of DRA deposits.
- Other proteins may also contribute to DRA.
Purpose of the Study:
- To investigate the role of alpha 2-macroglobulin (α2M) in dialysis-related amyloidosis.
- To compare serum α2M concentrations in DRA patients and controls.
- To assess the influence of hemodialysis membranes on α2M kinetics.
Main Methods:
- Studied 15 DRA patients and 15 controls undergoing hemodialysis (HD).
- Measured serum α2M, β2M, and α1 antitrypsin at baseline.
- Analyzed the correlation between α2M and β2M in both groups.
Main Results:
- Serum α2M levels were significantly higher in DRA patients than in controls (P < 0.026).
- Serum β2M levels were similar between groups.
- A positive correlation between serum α2M and β2M was observed in DRA patients (r = 0.64; P < 0.01).
- Serum α2M concentration was the primary predictor for the presence of DRA in stepwise analysis (P < 0.046).
Conclusions:
- Elevated serum α2M is associated with dialysis-related amyloidosis.
- α2M may play a significant role in the pathogenesis of DRA.
- Further research is needed to elucidate the exact mechanism of α2M in DRA.