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  • C8541 - Monoclonal Anti-Cytokeratin Peptide 18 antibody produced in mouse

C8541 Sigma-Aldrich

Monoclonal Anti-Cytokeratin Peptide 18 antibody produced in mouse

clone CY-90, ascites fluid

Synonym: Monoclonal Anti-Cytokeratin Peptide 18



Related Categories Alphabetical Index, Antibodies, Antibodies for Cell Biology, Antibodies to Cell and Organelle Proteins, Antibodies to Cytokeratins,
conjugate   unconjugated
clone   CY-90, monoclonal
biological source   mouse
application(s)   indirect immunofluorescence: 1:800 using formalin-fixed, paraffin-embedded sections of human tissue
  western blot: suitable
species reactivity   wide range
shipped in   dry ice
storage temp.   −20°C
antibody form   ascites fluid
isotype   IgG1
Quality Level   200
antibody product type   primary antibodies
contains   15 mM sodium azide


General description

Cytokeratin 18 (45 kDa) is the primary type I keratin expressed in simple epithelial cells. Epithelial cells and their derivatives characteristically contain intermediate filaments (IFs) composed of about 20 related polypeptides with molecular weights between 40,000-69,000. Each epithelial tissue has a specific and stable pattern of expression of some of these cytokeratin subunits. Epithelium derived tumors maintain the expression of the cytokeratins found in the normal tissue of origin. Therefore, carcinomas can be identified and classified by immunocytochemical staining with antibodies that react specifically with cytokeratins.

Monoclonal Anti-Cytokeratin Peptide 18 (mouse IgG1 isotype) is derived from the hybridoma produced by the fusion of mouse myeloma cells and splenocytes from an immunized mouse. Cytokeratin 18 (CK18)/keratin 18 is a structural protein and is present in single-layer epithelia. It is located on human chromosome 12q13.


The antibody reacts specifically with a wide variety of simple epithelia (e.g. intestine, respiratory and urinary systems, liver, and glandular epithelia). It does not react with stratified squamous epithelia (e.g. esophagus or epidermis) or with non-epithelial cells.


human epidermal carcinoma A-431 and MCF-7 human breast cancer cell lines.


Monoclonal Anti-Cytokeratin Peptide 18 antibody produced in mouse has been used in:
• immunofluorescence
• fluorescence microscopy
• confocal fluorescence microscopy
• immunolabelling
• histoblots


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Biochem/physiol Actions

Keratins help to maintain structural integrity. They also control Fas?mediated apoptosis and regulate cell size and protein synthesis. Cytokeratin 18 (CK18) plays a major role in the development of lung cancer. It acts as a therapeutic target for non-small cell lung cancer (NSCLC). CK-18 is considered as a promising plasma biomarker to identify patients with HELLP (hemolysis, elevated liver enzymes, low platelets) syndrome.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Protocols & Articles


Antibody Basics

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Western Blot Protocol | Immunoblotting Protocol

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