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Updated: May 13, 2026
A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro
Published on: June 2, 2022
Human uraemic serum displays calcific potential in vitro that increases with advancing chronic kidney disease
Ashish Patidar1, Dhruv K Singh, Peter Winocour
1School of Life and Medical Sciences, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK.
Insights
Serum from chronic kidney disease (CKD) patients can induce vascular calcification in smooth muscle cells. This calcific potential increases with kidney impairment, offering insights for CKD diagnostics and therapeutics.
Area of Science:
- Nephrology
- Cardiovascular Biology
- Cell Biology
Background:
- Vascular calcification (VC) is a significant complication in chronic kidney disease (CKD), contributing to high patient morbidity and mortality.
- While VC is regulated by circulating factors, the ability of patient serum to induce calcification outside the body, termed 'calcific potential,' is not well understood.
- Understanding serum calcific potential may reveal novel insights into VC pathogenesis in CKD.
Purpose of the Study:
- To investigate the capacity of serum from individuals with and without advancing CKD to induce calcification in cultured smooth muscle cells (SMCs).
- To correlate serum calcific potential with clinical parameters in CKD patients.
- To identify predictors of serum calcific potential in the CKD population.
Main Methods:
- Serum samples were collected from age- and sex-matched subjects with and without CKD.
- The ability of these serum samples to induce calcification in cultured SMCs was assessed.
- Correlations between serum calcific potential and various clinical and biochemical markers (e.g., creatinine, phosphate, PTH, OPG, eGFR, albumin) were analyzed.
Main Results:
- Serum from CKD patients induced significant calcification in cultured SMCs compared to controls.
- Serum from patients on hemodialysis showed higher calcific potential than those with moderate or advanced CKD.
- Serum creatinine, phosphate, parathyroid hormone (PTH), and osteoprotegerin (OPG) positively correlated with calcification, while eGFR, diastolic blood pressure, hemoglobin, and albumin showed negative correlations. Serum creatinine, albumin, and OPG were identified as significant predictors.
Conclusions:
- Uremic serum possesses a graded capacity to induce vascular calcification in vitro, reflecting the severity of kidney impairment.
- Serum creatinine, albumin, and OPG are key predictors of this calcific potential, though other unidentified factors likely contribute.
- These findings suggest potential for novel diagnostic and therapeutic strategies targeting vascular calcification in CKD patients.
Abstract:
Vascular calcification (VC) strongly correlates with declining renal function and contributes to the high morbidity and mortality of patients with CKD (chronic kidney disease). It is closely regulated by circulating factors but little is known about the capacity of serum from patients to induce calcification outside the disease setting, which we now define as the calcific potential of serum. We have therefore examined the ability of serum from age- and sex-matched subjects with and without advancing CKD to induce calcification of cultured SMCs (smooth muscle cells). Samples from patients with CKD induced significant calcification compared with controls. More importantly, samples from patients on haemodialysis induced significantly higher calcification than those with moderate or advanced CKD. The calcification induced by the latter two but not those on haemodialysis could be enhanced with calcium chloride and β-GP (β-glycerophosphate). A positive correlation was evident between measured serum creatinine, phosphate, PTH (parathyroid hormone), OPG (osteoprotegerin) and the degree of calcification in vitro. eGFR (estimated glomerular filtration rate), DBP (diastolic blood pressure), haemoglobin and serum albumin correlated negatively. Stepwise multivariate analysis of log-transformed calcific potential data highlighted serum creatinine, albumin and OPG as significant predictors, explaining approximately 50% of the variation. Thus, other regulators, either not investigated or as yet unidentified, may contribute to the calcification potential of serum in vitro. Furthermore, uraemic serum can induce graded calcification outside of the disease milieu that reflects the degree of kidney impairment in vivo. These findings could have important clinical relevance in terms of developing novel diagnostic and/or therapeutic strategies for subjects with CKD.
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