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Associations between Thyroid Hormones, Calcification Inhibitor Levels and Vascular Calcification in End-Stage Renal
Christiaan Lucas Meuwese1, Hannes Olauson1, Abdul Rashid Qureshi1
1Department of Renal Medicine, CLINTEC, Karolinska Institutet, Stockholm, Sweden.
Insights
Thyroid hormones, particularly fT3, may influence vascular calcification in end-stage renal disease (ESRD) patients by affecting calcification inhibitors like matrix Gla protein (MGP) and Klotho. However, the direct link to calcification remains complex.
Area of Science:
- Nephrology
- Endocrinology
- Cardiovascular Medicine
Background:
- Vascular calcification is a serious complication in end-stage renal disease (ESRD).
- Non-thyroidal illness may worsen vascular calcification by reducing inhibitors like matrix Gla protein (MGP) and Klotho.
- Understanding these mechanisms is crucial for managing ESRD complications.
Purpose of the Study:
- To investigate the association between thyroid hormone levels and vascular calcification in ESRD patients.
- To explore the relationship between thyroid hormones, calcification inhibitors (MGP, Klotho), and vascular health markers.
Main Methods:
- Measured thyroid hormones (fT3, fT4, TSH) and calcification inhibitors (MGP, Klotho) in 97 ESRD patients.
- Assessed coronary artery calcification (CAC) using CT scans and arterial stiffness via applanation tonometry.
Main Results:
- Lower fT3 levels correlated with higher CAC scores and arterial stiffness.
- fT3 was positively associated with desphospho-uncarboxylated MGP (dp-ucMGP) and soluble Klotho (sKlotho).
- fT4 and TSH also showed inverse associations with CAC scores.
Conclusions:
- Thyroid hormones, especially fT3, may influence MGP and Klotho synthesis, linking non-thyroidal illness to altered calcification inhibitor levels.
- The direct association between serum calcification inhibitors and vascular calcification/stiffness is complex and requires further investigation.
- Future studies should assess total MGP and membrane-bound Klotho to clarify these pathways.
Introduction:
Vascular calcification is a common, serious and elusive complication of end-stage renal disease (ESRD). As a pro-calcifying risk factor, non-thyroidal illness may promote vascular calcification through a systemic lowering of vascular calcification inhibitors such as matrix-gla protein (MGP) and Klotho.
Methods And Material:
In 97 ESRD patients eligible for living donor kidney transplantation, blood levels of thyroid hormones (fT3, fT4 and TSH), total uncarboxylated MGP (t-ucMGP), desphospho-uncarboxylated MGP (dp-ucMGP), descarboxyprothrombin (PIVKA-II), and soluble Klotho (sKlotho) were measured. The degree of coronary calcification and arterial stiffness were assessed by means of cardiac CT-scans and applanation tonometry, respectively.
Results:
fT3 levels were inversely associated with coronary artery calcification (CAC) scores and measures of arterial stiffness, and positively with dp-ucMGP and sKlotho concentrations. Subfractions of MGP, PIVKA-II and sKlotho did not associate with CAC scores and arterial stiffness. fT4 and TSH levels were both inversely associated with CAC scores, but not with arterial stiffness.
Discussion:
The positive associations between fT3 and dp-ucMGP and sKlotho suggest that synthesis of MGP and Klotho is influenced by thyroid hormones, and supports a link between non-thyroidal illness and alterations in calcification inhibitor levels. However, the absence of an association between serum calcification inhibitor levels and coronary calcification/arterial stiffness and the fact that MGP and Klotho undergo post-translational modifications underscore the complexity of this association. Further studies, measuring total levels of MGP and membrane bound Klotho, should examine this proposed pathway in further detail.
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