Carbonic Anhydrase IX/CA9 Antibody (SPM314) [Alexa Fluor® 700]


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Product Details

Reactivity Hu, EqSpecies Glossary
Applications WB, ELISA, Flow, ICC/IF, IHC, IHC-Fr, IHC-P
Alexa Fluor 700

Order Details

Carbonic Anhydrase IX/CA9 Antibody (SPM314) [Alexa Fluor® 700] Summary

Microsomal fraction of human renal cortical tissue homogenate was used to develop this Carbonic Anhydrase IX/CA9 Antibody (SPM314).
Cell surface and cytoplasmic
Renal Cell Marker
Recognizes a glycoprotein of ~200kDa, identified as carbonic anhydrase IX (CAIX/gp200). Its epitope resides in the carbohydrate domain of gp200. It shows no significant cross-reactivity with other carbohydrate determinants, such as the Lewis blood group antigens, epithelial membrane antigen, HMFG, and AB blood group antigens. In normal kidney, gp200 is localized along the brush border of the pars convoluta and pars recta segments of the proximal tubule, as well as focally along the luminal surface of Bowman's capsule adjoining the outgoing proximal tubule. Reportedly, gp200 is expressed by 93% of primary and 84% of metastatic renal cell carcinomas. This MAb may be useful in the investigations of carcinomas of proximal nephrogenic differentiation especially those showing tubular differentiation.
IgG2b Kappa
Protein A purified
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  • Western Blot
  • Flow Cytometry
  • Immunocytochemistry/Immunofluorescence
  • Immunohistochemistry
  • Immunohistochemistry-Frozen
  • Immunohistochemistry-Paraffin

Packaging, Storage & Formulations

Store at 4C in the dark.
50mM Sodium Borate
0.05% Sodium Azide
Protein A purified


Alexa Fluor (R) products are provided under an intellectual property license from Life Technologies Corporation. The purchase of this product conveys to the buyer the non-transferable right to use the purchased product and components of the product only in research conducted by the buyer (whether the buyer is an academic or for-profit entity). The sale of this product is expressly conditioned on the buyer not using the product or its components, or any materials made using the product or its components, in any activity to generate revenue, which may include, but is not limited to use of the product or its components: (i) in manufacturing; (ii) to provide a service, information, or data in return for payment; (iii) for therapeutic, diagnostic or prophylactic purposes; or (iv) for resale, regardless of whether they are resold for use in research. For information on purchasing a license to this product for purposes other than as described above, contact Life Technologies Corporation, 5791 Van Allen Way, Carlsbad, CA 92008 USA or This conjugate is made on demand. Actual recovery may vary from the stated volume of this product. The volume will be greater than or equal to the unit size stated on the datasheet.

Alternate Names for Carbonic Anhydrase IX/CA9 Antibody (SPM314) [Alexa Fluor® 700]

  • CA9
  • CAIX
  • CA-IX
  • Carbonate dehydratase IX
  • carbonic anhydrase 9
  • Carbonic Anhydrase IX
  • carbonic dehydratase
  • EC
  • G250
  • Membrane antigen MN
  • MN
  • P54/58N
  • PMW1
  • RCC
  • RCC-associated antigen G250
  • RCC-associated protein G250
  • Renal cell carcinoma-associated antigen G250


Carbonic anhydrase alpha, isozyme IX, belongs to a family of zinc-containing metalloproteins which hydrate carbon dioxide to generate bicarbonate ions and protons (1). This main catalytic function allows carbonic anhydrase IX to participate in cellular pH regulation. The large family of carbonic anhydrase metalloproteins includes three major classes which have been identified based on sequence and structure analysis. The alpha class is a monomer found in mammals. The beta class may occur as a dimer, tetramer, hexamer or octamer and is found in plants, algae, and bacteria. Lastly, the gamma class is a trimer found in bacteria and represents the most ancient carbonic anhydrase. These three classes of carbonic anhydrase enzymes lack sequence or structural similarities, but all share a conserved active site zinc atom (1).

Carbonic anhydrase IX (theoretical molecular weight 50kDa) belongs to the monomeric alpha class and is a single pass-transmembrane protein with two extracellular domains which serve catalytic and cell adhesion functions (2, 3). By cooperating with sodium bicarbonate cotransporters (NBC), lactate and proton exporting monocarboxylic acid transporters (MCT), and a sodium/hydrogen exchanger (NHE), carbonic anhydrase IX is involved in pH regulation across the cell membrane. This functional property protects cancer cells from intracellular acidification and partly explains the role of carbonic anhydrase IX in cancer cell survival and proliferation. In contrast, the pH regulating activity of carbonic anhydrase IX induces extracellular acidification, which has been implicated in epithelial to mesenchymal transition (EMT) and promoting cancer invasion. Carbonic anhydrase IX is frequently overexpressed in cancer cells (e.g., colorectal-, breast-, lung-carcinoma and brain tumors), an effect promoted by hypoxia within the tumor microenvironment (4). An exception are tumors carrying pVHL inactivating mutations, such as clear cell renal cell carcinoma (ccRCC), where HIF-alpha is stabilized due to dysfunctional proteasomal targeting and can induce HRE (Hypoxia Response Element) containing genes even under physiological normoxia (5). Carbonic anhydrase IX may be detected by immunostaining in tumors, which is found in association with necrotic tissue and metastatic cells. Because the expression of carbonic anhydrase IX correlates with both tumor grade and stage, analysis of its expression in tumors serves as a prognostic factor (4, 6).


1. Tripp, B. C., Smith, K., & Ferry, J. G. (2001). Carbonic Anhydrase: New Insights for an Ancient Enzyme. Journal of Biological Chemistry.

2. Nishimori, I., & Onishi, S. (2001). Carbonic anhydrase isozymes in the human pancreas. Digestive and Liver Disease.

3. Zavadova, Z., & Zavada, J. (2005). Carbonic anhydrase IX (CA IX) mediates tumor cell interactions with microenvironment. Oncology Reports.

4. Pastorekova, S., & Gillies, R. J. (2019). The role of carbonic anhydrase IX in cancer development: links to hypoxia, acidosis, and beyond. Cancer and Metastasis Reviews.

5. Haase, V. (2009). The VHL Tumor Suppressor: Master Regulator of HIF. Current Pharmaceutical Design.

6. Young, J. R., Coy, H., Kim, H. J., Douek, M., Sisk, A., Pantuck, A. J., & Raman, S. S. (2018). Association of the gross appearance of intratumoral vascularity at MDCT with the carbonic anhydrase IX score in clear cell renal cell carcinoma. American Journal of Roentgenology.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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Product General Protocols

Video Protocols

WB Video Protocol
ICC/IF Video Protocol

FAQs for Carbonic Anhydrase IX/CA9 Antibody (NBP2-34408AF700) (0)

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Secondary Antibodies


Isotype Controls

Other Available Formats

Alexa Fluor 350 NBP2-34408AF350
Alexa Fluor 405 NBP2-34408AF405
Alexa Fluor 488 NBP2-34408AF488
Alexa Fluor 532 NBP2-34408AF532
Alexa Fluor 594 NBP2-34408AF594
Alexa Fluor 647 NBP2-34408AF647
Alexa Fluor 700 NBP2-34408AF700
Alexa Fluor 750 NBP2-34408AF750
Allophycocyanin NBP2-34408APC
Biotin NBP2-34408B
DyLight 350 NBP2-34408UV
DyLight 405 NBP2-34408V
DyLight 488 NBP2-34408G
DyLight 550 NBP2-34408R
DyLight 594 NBP2-34408DL594
DyLight 650 NBP2-34408C
DyLight 680 NBP2-34408FR
DyLight 755 NBP2-34408IR
FITC NBP2-34408F
HRP NBP2-34408H
Janelia Fluor 549 NBP2-34408JF549
Janelia Fluor 646 NBP2-34408JF646
PE NBP2-34408PE
PerCP NBP2-34408PCP

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Blogs on Carbonic Anhydrase IX/CA9.

Carbonic anhydrase IX (CAIX) - a reliable histochemical marker of hypoxia
Carbonic anhydrase IX is a member of the carbonic anhydrase family. This family consists of catalytic enzymes capable of converting carbon dioxide and water into carbonic acid, protons, and bicarbonate ions. This family of molecules is abundantly e...  Read full blog post.

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Gene Symbol CA9