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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
Published on: May 31, 2016
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Therapeutic Interference With Vascular Calcification-Lessons From Klotho-Hypomorphic Mice and Beyond.
Florian Lang1, Christina Leibrock1,2, Lisann Pelzl1
1Department of Physiology I, Eberhard Karls-University, Tübingen, Germany.
Frontiers in Endocrinology
|May 22, 2018
Summary
Ammonium salts and other therapies can prevent vascular calcification in mice with chronic kidney disease by targeting hyperphosphatemia and smooth muscle cell changes. Further research is needed to see if these findings apply to human patients.
Area of Science:
- Cardiovascular Medicine
- Nephrology
- Biochemistry
Background:
- Medial vascular calcification, linked to cardiovascular disease, involves vascular smooth muscle cell (VSMC) transdifferentiation.
- In chronic kidney disease (CKD), hyperphosphatemia drives VSMC transdifferentiation and vascular calcification due to impaired kidney function.
- Klotho-hypomorphic mice exhibit hyperphosphatemia and vascular calcification, driven by excessive 1,25(OH)2D3 formation, leading to calcium and phosphate retention.
Purpose of the Study:
- To investigate pathophysiological mechanisms of vascular calcification in klotho-hypomorphic mice.
- To identify therapeutic opportunities for delaying or halting vascular calcification.
- To explore the efficacy of bicarbonate, carbonic anhydrase inhibition, magnesium, mineralocorticoid receptor (MR) blockage, and ammonium salts.
Main Methods:
- Analysis of klotho-hypomorphic mice and mice with vitamin D3 overload.
- Evaluation of the effects of bicarbonate, carbonic anhydrase inhibition, magnesium supplementation, MR blockage, and ammonium salts on vascular calcification.
- Assessment of mechanisms including intestinal phosphate absorption, metabolic acidosis, and VSMC signaling.
Main Results:
- Bicarbonate reduces vascular calcification by decreasing intestinal phosphate absorption.
- Carbonic anhydrase inhibition induces metabolic acidosis, counteracting calcium-phosphate precipitation and VSMC transdifferentiation.
- Magnesium supplementation, MR blockage, and ammonium salts interfere with osteo-/chondrogenic signaling in VSMCs, with ammonium salts showing the highest efficacy.
Conclusions:
- Several therapeutic strategies, including ammonium salts, show promise in preventing vascular calcification in mouse models.
- Understanding these mechanisms offers potential therapeutic avenues for managing vascular calcification in CKD patients.
- Further research is crucial to determine the translatability of these findings to human clinical practice.
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