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Updated: Jun 20, 2026
07:49
Matrix-assisted Laser Desorption/Ionization Time of Flight (MALDI-TOF) Mass Spectrometric Analysis of Intact Proteins Larger than 100 kDa
Published on: September 9, 2013
Proteomic analysis of a matrix stone: a case report
Benjamin K Canales1, Lorraine Anderson, LeeAnn Higgins
1Department of Urologic Surgery, University of Minnesota, Minneapolis, MN, USA. Benjamin.canales@urology.ufl.edu
Urological Research
|September 5, 2009
Summary
Matrix stones are soft, radiolucent kidney stones composed of protein. Analysis revealed novel inflammatory and defensive proteins, offering new insights into stone formation and rare stone pathogenesis.
Area of Science:
- Nephrology
- Biochemistry
- Materials Science
Background:
- Matrix stones are rare, soft, radiolucent renal calculi composed of muco-proteinaceous material.
- Understanding their proteomic composition is crucial for elucidating their pathogenesis.
Observation:
- Surgically removed matrix stones were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and tandem mass spectrometry.
- XRD revealed biological apatite, while SEM showed fibrous, net-like structures with bacterial, cellular, and crystalline material.
Findings:
- Proteomic analysis identified 33 unique proteins, with 90% not previously reported in matrix stones.
- Over 70% of the identified proteins are associated with inflammatory or defensive functions.
Implications:
- The novel protein findings suggest a significant inflammatory or defensive role in matrix stone formation.
- Further characterization of matrix stone proteomes may illuminate the pathogenesis of this rare condition and mineral processes in calculi.
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