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Parathyroid hormone dependent T cell proliferation in uremic rats
E Lewin1, J Ladefoged, L Brandi
1Nephrological Dept. P, Rigshospitalet, University of Copenhagen, Denmark.
Kidney International
|August 1, 1993
Summary
Chronic renal failure (CRF) impairs immune function, increasing T cell responses to PHA. Lowering parathyroid hormone (PTH) levels normalized these T cell responses in CRF rats, suggesting PTH drives this effect.
Area of Science:
- Immunology
- Nephrology
- Endocrinology
Background:
- Chronic renal failure (CRF) is associated with immune system dysfunction.
- T cells may be affected by parathyroid hormone (PTH), which is elevated in CRF.
- Secondary hyperparathyroidism is a common complication of chronic uremia.
Purpose of the Study:
- To investigate T cell function in rats with CRF.
- To determine the role of parathyroid hormone (PTH) in altered T cell responses in CRF.
- To examine the effects of parathyroidectomy and kidney transplantation on T cell function in CRF.
Main Methods:
- Compared T cell proliferative responses to phytohemagglutinin (PHA) in normal and CRF rats.
- Assessed T cell function before and after parathyroidectomy and kidney transplantation.
- Investigated the in vitro effect of rat PTH 1-84 on T cell proliferation.
Main Results:
- T cell proliferative response to PHA was significantly higher in CRF rats compared to normal rats.
- Parathyroidectomy normalized the PHA-induced T cell proliferation in CRF rats.
- Isogenic kidney transplantation reversed CRF and normalized PTH levels, restoring normal T cell proliferation.
- Rat PTH 1-84 dose-dependently stimulated PHA-induced T cell proliferation, particularly in CRF rat lymphocytes.
Conclusions:
- Secondary hyperparathyroidism in chronic uremia contributes to the enhanced proliferative response of T cells to PHA.
- PTH directly influences T cell function in the context of CRF.
- Restoring normal PTH levels can normalize T cell immune responses in CRF.