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Toxicity in uremia. 2. Correlation between PTH levels and impaired aspecific immunity
R Esposito1, C Romano-Carratelli, N Lanzetti
1Institute of Internal Medicine and Nephrology, 1st Faculty, University of Naples, Italy.
Abstract:
The role of PTH in depressing polynuclear leucocyte (PMN) phagocytosis in uremia was investigated. The hydrophobicity and phagocytic activity of normal PMN was tested in presence of uremic patients' serum with low (Group A) or high (Group B) levels of plasma PTH. The PMN phagocytic index was lowered by serum of both groups, but more in presence of Group B serum (p A vs B less than 0.002). Similarly, the contact angle of cells was affected more in presence of serum of patients with high PTH levels (p B vs A less than 0.003; p B vs C less than 0.002).
Insights
High parathyroid hormone (PTH) levels in uremia significantly impair the phagocytic activity of polymorphonuclear leukocytes (PMNs). This study shows elevated PTH directly reduces immune cell function in kidney disease patients.
Area of Science:
- Nephrology
- Immunology
- Biochemistry
Background:
- Uremia, a condition of kidney failure, is associated with immune dysfunction.
- Polymorphonuclear leukocytes (PMNs) are critical immune cells responsible for phagocytosis.
- The specific role of parathyroid hormone (PTH) in modulating PMN function during uremia is not fully understood.
Purpose of the Study:
- To investigate the impact of parathyroid hormone (PTH) on the phagocytic capacity of normal PMNs in the context of uremia.
- To determine if varying levels of plasma PTH in uremic patients affect PMN hydrophobicity and phagocytosis.
Main Methods:
- Normal PMNs were incubated with serum from uremic patients categorized into low (Group A) and high (Group B) plasma PTH levels.
- Phagocytic activity was assessed using a phagocytic index.
- Cellular hydrophobicity was measured by contact angle analysis.
Main Results:
- Serum from both uremic groups reduced the PMN phagocytic index, with a significantly greater reduction observed in the presence of high PTH serum (Group B) compared to low PTH serum (Group A).
- Similarly, cellular hydrophobicity, measured by contact angle, was significantly more affected by serum from patients with high PTH levels.
- Statistical significance was noted for comparisons between Group B and Group A (p < 0.002 for phagocytosis; p < 0.003 for contact angle) and Group B and a control group (p < 0.002 for contact angle).
Conclusions:
- Elevated plasma PTH levels in uremic patients significantly depress the phagocytic function of normal PMNs.
- Increased PTH contributes to the altered hydrophobicity and reduced phagocytic activity observed in immune cells during uremia.
- These findings highlight PTH as a key factor in uremic immunodeficiency, suggesting potential therapeutic targets.