Invitrogen™ Cytokeratin 18 Monoclonal Antibody (LDK18), eFluor™ 570, eBioscience™

Catalog No.	Quantity
41-981-582	100 μg

Catalog No. 41-981-582 Supplier Invitrogen™ Supplier No. 41981582

Description

Mouse Monoclonal Antibody

The monoclonal antibody LDK18 recognizes human Cytokeratin 18. Cytokeratin 18 is member of the large family of intermediate filaments found within epithelial cells. The family of cytokeratins is made up of type I (acidic) and type II (basic) members which form heterodimers by pairing an acidic with a basic member to compose the keratin filament. Cytokeratin 18 (type I) is most commonly found associated with cytokeratin 8 (type II). Because many tumors of epithelial origin retain expression of keratin proteins, cytokeratin 18 has been used as a tumor marker to identify both tumors and metastases. In addition, cytokeratin 18 has been shown to be expressed in highly proliferative retinal pigment epithelium cells. Applications Reported: This LDK18 antibody has been reported for use in microscopy, immunohistochemical staining, and immunocytochemistry. Applications Tested: This LDK18 antibody has been tested by immunocytochemistry of MeOH-fixed human cells and can be used at less than or equal to 1 μg/mL. It is recommended that the antibody be carefully titrated for optimal performance in the assay of interest. Filter Recommendation: When using this eFluor 570 antibody conjugate, we recommend a filter that will capture the 570 emission wavelength (for example, Excitation 545/25, 565LP, Emission 605/70). A standard Alexa Fluor 555 or TRITC filter is acceptable. Excitation: 555 nm; Emission: 570 nm.

Cytokeratin 18 (Keratin 18, KRT18, type I cytoskeletal 18) belongs to the type A (acidic) subfamily of low molecular weight keratins, exists in combination with cytokeratin 8. Tissues from gastrointestinal tract, respiratory tract and urogenital tract, as well as endocrine and exocrine tissues and mesothelial cells are positive for cytokeratin 18. Further, cytokeratin 18 is found primarily in non-squamous epithelia and is present in a majority of adenocarcinomas and ductal carcinomas, but not in squamous cell carcinomas. Hepatocellular carcinomas express only cytokeratins 8 and 18. Mutations in the cytokeratin 18 gene have been linked to cryptogenic cirrhosis. Two transcript variants encoding the same protein have been found for the cytokeratin 18 gene. Cytokeratin subtype expression patterns are used to an increasing extent in the distinction of different types of epithelial malignancies. The cytokeratin antibodies are not only of assistance in the differential diagnosis of tumors using immunohistochemistry on tissue sections, but are also a useful tool in cytopathology and flow cytometric assays.

Specifications

• Antigen: Cytokeratin 18
• Applications: Immunohistochemistry, Immunocytochemistry
• Classification: Monoclonal
• Clone: LDK18
• Concentration: 0.2 mg/mL
• Conjugate: eFluor 570
• Formulation: PBS with 0.09% sodium azide; pH 7.2
• Gene: KRT18
• Gene Accession No.: P05783
• Gene Alias: cb83; Cell proliferation-inducing gene 46 protein; CK 18; CK18; CK-18; CYK18; cytokeratin 18; cytokeratin endo B; cytokeratin type -1; DAPK-1; Cytokeratin18; cytokeratin-18; dapk1; dorsal aorta proneprin kinesin-1; DreK18; Endo B; I79_023185; K 18; K18; keratin 18; keratin 18, type I; keratin 18a, tandem duplicate 1; keratin complex 1, acidic, gene 18; keratin D; Keratin, type I cytoskeletal 18; Keratin18; keratin-18; Kerd; KRT 18; Krt1-18; KRT18; krt18 {ECO:0000250; krt18a.1; LOC100008885; PIG46; sb:cb83; type I cytoskeletal 18; UniProtKB:P05783}; wu:fa13f02; wu:fb36b04
• Gene Symbols: KRT18
• Host Species: Mouse
• Purification Method: Affinity chromatography
• Quantity: 100 μg
• Regulatory Status: RUO
• Primary or Secondary: Primary
• Gene ID (Entrez): 3875
• Target Species: Human
• Content And Storage: 4°C, store in dark, DO NOT FREEZE!
• Product Type: Antibody
• Form: Liquid
• Isotype: IgG1 κ

Frequently Asked Questions (FAQs)

I am unable to analyze my cells stained with eFluor Organic Dyes today. What options do I have?

Our options will depend on the samples you are analyzing.

If cell viability is not critical, you can store your stained samples at 4 degrees C or on ice overnight in the dark and analyze the following day.

For samples stained with eFluor organic fluorochromes, we recommend that cells be suspended in 100 uL of Flow Cytometry Staining Buffer (Cat. No. 00-4222) and 100 uL of eBioscience IC Fixation Buffer (Cat. No. 00-8222); samples can be incubated for up to 3 days at 4 degrees C in the dark. Alternatively, the 1-step Fix/Lyse Solution (Cat. No. 00-5333) can be used. This is a great option when working with whole blood but also works for other cell types.

Can the eFluor Organic fluorochromes be used for intracellular staining?

Yes, the eFluor Organic fluorochromes can be used for intracellular staining. The eFluor organic fluorochromes maintain bright signal and require minimal changes in compensation when fixed with eBioscience IC Fixation Buffer (Cat. No. 00-8222-49) and Permeabilization Buffer (Cat. No. 00-8333-56) or 1-step Fix/Lyse Solution (Cat. No. 00-5333-54, 00-5333-57) (as compared to live cells).

What buffers are compatible with the eFluor Organic fluorochromes and eVolve QDots?

The eFluor Organic fluorochromes and eVolve QDots can be used with flow staining buffers containing PBS and protein.

What is the difference between eFluor Organic Dyes and eVolve Qdots?

The eFluor Organic Dyes (eFluor 450, APC-eFluor 780, PerCP-eFluor 710, eFluor 710) are conventional fluorochromes. In contrast, the eVolve line of products are Quantum dots.

Are the eFluor Organic Dyes photo-labile?

As with other fluorochromes, we recommend minimal exposure to light to maintain optimal signal.

Safety and Handling

WARNING: Cancer - www.P65Warnings.ca.gov