Ksp-Cadherin

Ksp-Cadherin (Kidney-specific Cadherin) is a novel, kidney-specific member of the Cadherin family of cell-adhesion molecules. Within the kidney, Ksp-Cadherin is found exclusively in the basolateral membrane of renal tubular epithelial cells and collecting duct cells, and not in glomeruli, renal interstitial cells, or blood vessels. Di� erent Cadherins, including E-Cadherin, Cadherin-6, and N-Cadherin, have been investigated in Renal Cell Cancers, demonstrating possible correlations of tumor differentiation and the presence of lymph node metastasis with loss of Cadherins.

Ksp-Cadherin has been used to distinguish Chromophobe Renal-Cell Carcinoma from Oncocytoma. Studies have found a membranous pattern of staining in 96% of 30 Chromophobe Carcinomas, and in only 6% of 31 Oncocytomas, leading to conclude that this is a useful antibody in differentiating these two lesions. On the other hand, another study found Ksp-Cadherin positivity in 100% of 13 chromophobe RCCs, and 95% of 20 Oncocytomas.

Ksp-Cadherin is a mouse monoclonal antibody derived from cell culture supernatant that is concentrated, dialyzed, filter sterilized and diluted in buffer pH 7.5, containing BSA and sodium azide as a preservative.

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2. Shen SS, et al. Mod Pathol. 2005;Jul;18(7):933-40
3. Thedieck C, et al. Br J Cancer. 2005;Jun6;92(11):2010-7

1. Cut and mount 3-4 micron formalin-fixed paraffin-embedded tissues on positive charged slides.
2. Air dry for 2 hours at 58° C.
3. Deparaffinize, dehydrate and rehydrate tissues.
4. Subject tissues to heat epitope retrieval using a suitable retrieval solution such as ImmunoDNA Retriever with Citrate (BSB 0020-BSB 0023) or EDTA (BSB 0030-BSB 0033).
5. Any of three heating methods may be used:
   • Electric Pressure Cooker
     Place standoff rack at base of pressure cooker. Add 1-2 inches of distilled water to the pressure cooker and turn heat to high, and incubate for 15 minutes. Open and immediately transfer slides to room temperature.
   • Water Bath Method
     Place tissues/slides in a pre-warmed staining dish or coplin jar containing the ImmunoDNA Retriever with Citrate or EDTA in a water bath set at 95°-99° C. Incubate for 30-60 minutes.
   • Conventional Steamer Method
     Place tissues/slides in a pre-warmed staining dish or coplin jar containing the ImmunoDNA Retriever with Citrate or EDTA in a Steamer, cover and steam for 30-60 minutes.
6. After heat treatment, transfer slides in ImmunoDNA Retriever with Citrate or EDTA to room temperature and let stand for 15-20 minutes.
7. Wash slides with IHC wash buffer or DI water.
8. Continue IHC staining protocol.