General description

Carbonic anhydrases are a family of zinc containing metalloproteins that catalyze the reversible hydration of CO﹤sub>2﹤/sub>. Among these, carbonic anhydrase IX (CA IX) is anchored to the cell membrane and is expressed in the human gastrointestinal tract, chiefly in the stomach and gall bladder¹. It is interesting to note that CA IX is overexpressed in epithelial malignancies of the uterus, cervix, lung, breast, and kidney; none of the associated normal tissues express this isozyme.^1-4 CA IX is said to maintain the extracellular acidic pH, thus promoting cell growth in these tumors.⁵ Preliminary data suggest consistent immunoreactivity for anti-CA IX in clear cell renal cell carcinoma (RCC) with demonstrated sensitivity of 85% to 100%.² Anti-CA IX, together with antibodies against PAX-2, Ksp-cadherin, and CD117, contributes to a robust panel that can be used to help make this distinction. Strong diffuse-to-multifocal immunostaining for anti-CA IX is observed in the large majority of urothelial carcinomas as opposed to the extremely weak and focal immunoreactivity seen in collecting duct carcinoma (CDC). Anti-CA IX can thus aid in distinguishing between urothelial carcinoma and CDC.⁶

Legal Information

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Linkage

Carbonic Anhydrase IX (CA IX) Positive Control Slides, Product No. 379S, are available for immunohistochemistry (formalin-fixed, paraffin-embedded sections).

Other Notes

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Physical form

Solution in Tris Buffer, pH 7.3-7.7, with 1% BSA and ﹤0.1% Sodium Azide.

Preparation Note

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Quality