Expression profile of carbonic anhydrases in articular cartilage |
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Authors: | Melissa Schultz Wu Jin Abdul Waheed Berton R Moed William Sly Zijun Zhang |
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Institution: | (1) Center for Anatomical Science and Education, Saint Louis University, St. Louis, MO, USA;(2) Department of Orthopaedic Surgery, School of Medicine, Saint Louis University, 3635 Vista Avenue, DT-7, St. Louis, Missouri 63110, USA;(3) Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University, St. Louis, MO, USA; |
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Abstract: | Carbonic anhydrases (CAs), which catalyze the reversible reaction of carbonate hydration, are important for cartilage homeostasis.
The full spectrum of CA activity of all 13 isoenzymes in articular cartilage is unknown. This study quantified the mRNA profile
of CAs in rat articular cartilage, using quantitative polymerase chain reactions. Among the 13 functional CAs, CAs II, III,
Vb, IX, XII and XIII were significantly expressed at mRNA level by the chondrocytes in articular cartilage. To verify these
significantly expressed CAs in articular cartilage at protein level, immunohistochemistry was performed. While CAs III, Vb
and XII distributed in the full-thickness of cartilage, including the calcified zone of cartilage, CA II was mainly localized
in the proliferative zone of cartilage. CA IX was limited in the superficial zone of cartilage and CA XIII expressed in the
superficial and partially mid zone. These results provide a framework for understanding individual CAs as well as the integrated
CA family in cartilage biology, including matrix mineralization. |
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