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GENE AND PROTEIN SUMMARY

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Gene name

CASP8

Description

caspase 8, apoptosis-related cysteine peptidase

Protein class

Candidate cancer biomarkers, Enzymes, Mapped to UniProt SWISS-PROT, Peptidases, Potential transmembrane proteins

Protein evidence

Medium

Entrez gene summary

This gene encodes a member of the cysteine-aspartic acid protease (caspase) family. Sequential activation of caspases plays a central role in the execution-phase of cell apoptosis. Caspases exist as inactive proenzymes composed of a prodomain, a large protease subunit, and a small protease subunit. Activation of caspases requires proteolytic processing at conserved internal aspartic residues to generate a heterodimeric enzyme consisting of the large and small subunits. This protein is involved in the programmed cell death induced by Fas and various apoptotic stimuli. The N-terminal FADD-like death effector domain of this protein suggests that it may interact with Fas-interacting protein FADD. This protein was detected in the insoluble fraction of the affected brain region from Huntington disease patients but not in those from normal controls, which implicated the role in neurodegenerative diseases. Many alternatively spliced transcript variants encoding different isoforms have been described, although not all variants have had their full-length sequences determined. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

17 in total
0 with predicted TM region
0 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Cytoplasm

Additional location(s)

Nucleus but not nucleoli, Mitochondria, Centrosome 

Staining summary

Mainly localized to cytoplasm. Additionally localized to nucleus, mitochondria and centrosome.

Reliability (APE)

Low

Antibodies in assay

HPA001302, CAB002047, HPA005688
 

NORMAL TISSUE & ORGAN SUMMARY

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Expression summary

Cytoplasmic staining of varying intensity in most tissues.

Tissue specificity

Expressed in 72 out of 80 cell types

Reliability (APE)

Low

Antibodies in assay

HPA001302, CAB002047, HPA005688
 

Organ

No of cell types

Protein expression

CNS (brain) 11
Hematopoietic (blood) 8
Liver and pancreas 5
Digestive (GI-tract) 13
Respiratory (lung) 4
Cardiovascular 1
Female tissues 13
Placenta 2
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 12
Endocrine tissues 3

Level of annotated protein expression





High
Medium
Low
None

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 80% of the cancers

Antibodies in assay

HPA001302, CAB002047, HPA005688
 

Tissue

Cancer staining

Protein
expression of
normal tissue

Breast cancer
 
Carcinoid
 
Cervical cancer
 
 
Colorectal cancer
 
 
Endometrial cancer
 
 
Glioma
 
Head and neck cancer
 
 
Liver cancer
 
 
Lung cancer
 
 
Lymphoma
 
 
 

Tissue

Cancer staining

Protein
expression of
normal tissue

Melanoma
 
Ovarian cancer
 
Pancreatic cancer
 
Prostate cancer
 
Renal cancer
 
Skin cancer
 
Stomach cancer
 
 
Testis cancer
 
Thyroid cancer
 
Urothelial cancer
 

Level of antibody staining





Strong
Moderate
Weak
Negative

CELL LINE SUMMARY

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RNA evidence

High
 

Cell line

Cell origin

RNA abundance

IH staining

IF intensity

HPA001302

CAB002047

HPA005688

HPA001302

CAB002047

HPA005688

A-431 Skin High
ModerateNegativeModerate
A-549 Lung Medium
CACO-2 Colon High

-

-

HEK 293 Embryonal kidney Medium
HeLa Cervix High
Hep-G2 Liver High
MCF-7 Pleural effusion Medium
PC-3 Bone marrow High
RT-4 Urinary bladder High
U-2 OS Bone High
ModerateModerate
U-251 MG Brain Medium
ModerateNegativeModerate

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

HPA001302 pAb
CAB002047 mAb
HPA005688 pAb