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GENE AND PROTEIN SUMMARY

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Gene name

STAT3

Description

signal transducer and activator of transcription 3 (acute-phase response factor)

Protein class

Mapped to UniProt SWISS-PROT, SH2-domain containing proteins, Transcription factors

Protein evidence

High

Entrez gene summary

The protein encoded by this gene is a member of the STAT protein family. In response to cytokines and growth factors, STAT family members are phosphorylated by the receptor associated kinases, and then form homo- or heterodimers that translocate to the cell nucleus where they act as transcription activators. This protein is activated through phosphorylation in response to various cytokines and growth factors including IFNs, EGF, IL5, IL6, HGF, LIF and BMP2. This protein mediates the expression of a variety of genes in response to cell stimuli, and thus plays a key role in many cellular processes such as cell growth and apoptosis. The small GTPase Rac1 has been shown to bind and regulate the activity of this protein. PIAS3 protein is a specific inhibitor of this protein. Three alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

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

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Nucleus but not nucleoli, Cytoplasm

Additional location(s)

 

Staining summary

Localized to the nucleus and the cytoplasm.

Reliability (APE)

Medium

Antibodies in assay

HPA001671, CAB003859
 

NORMAL TISSUE & ORGAN SUMMARY

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Expression summary

Ubiquitous cytoplasmic and nuclear expression at variable levels.

Tissue specificity

Expressed in 64 out of 80 cell types

Reliability (APE)

Medium

Antibodies in assay

HPA001671, CAB003859
 

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 12
Placenta 2
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 13
Endocrine tissues 3

Level of annotated protein expression





High
Medium
Low
None

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 69% of the cancers

Antibodies in assay

HPA001671, CAB003859
 

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

HPA001671

CAB003859

HPA001671

CAB003859

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

-

HEK 293 Embryonal kidney High
HeLa Cervix High
Hep-G2 Liver High
MCF-7 Pleural effusion High
PC-3 Bone marrow Not detected
RT-4 Urinary bladder High
U-2 OS Bone High
ModerateNegative
U-251 MG Brain High
ModerateNegative

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

HPA001671 pAb
CAB003859 mAb