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COX2/ Cyclooxygenase 2/ PTGS2 Polyclonal antibody

COX2/ Cyclooxygenase 2/ PTGS2 Polyclonal Antibody for IF, IHC, WB, ELISA

Host / Isotype

Rabbit / IgG


human, mouse, rat and More (2)





Cat no : 12375-1-AP


COX2/ Cyclooxygenase 2/ PTGS2

Tested Applications

Positive WB detected inA549 cells, RAW 264.7 cells, Raji cells, Hela cells, NIH/3T3 cells
Positive IHC detected inhuman breast cancer tissue, human lung cancer tissue
Note: suggested antigen retrieval with TE buffer pH 9.0; (*) Alternatively, antigen retrieval may be performed with citrate buffer pH 6.0
Positive IF detected inHepG2 cells

Recommended dilution

Western Blot (WB)WB : 1:1000-1:4000
Immunohistochemistry (IHC)IHC : 1:50-1:500
Immunofluorescence (IF)IF : 1:50-1:500
Sample-dependent, check data in validation data gallery

Product Information

12375-1-AP targets COX2/ Cyclooxygenase 2/ PTGS2 in WB, IHC, IF, ELISA applications and shows reactivity with human, mouse, rat samples.

Tested Reactivity human, mouse, rat
Cited Reactivityhuman, mouse, rat, chicken, pig
Host / Isotype Rabbit / IgG
Class Polyclonal
Type Antibody
Immunogen COX2/ Cyclooxygenase 2/ PTGS2 fusion protein Ag3025
Full Name prostaglandin-endoperoxide synthase 2 (prostaglandin G/H synthase and cyclooxygenase)
Calculated molecular weight 604 aa, 68 kDa
Observed molecular weight 70-74 kDa
GenBank accession numberBC013734
Gene symbol PTGS2
Gene ID (NCBI) 5743
Conjugate Unconjugated
Form Liquid
Purification Method Antigen affinity purification
Storage Buffer PBS with 0.02% sodium azide and 50% glycerol pH 7.3.
Storage ConditionsStore at -20°C. Stable for one year after shipment. Aliquoting is unnecessary for -20oC storage.

Background Information

COX2 is an enzyme involved in the synthesis of prostaglandins from arachidonic acid.

1. What is the molecular weight of COX2?

The fully N-glycosylated PTGS2 is 72-74 kDa and the aglycosylated is 66 kDa (PMID:19656660). It also 

expresses a band of 39 kDa after unspecific cleavage (PMID:17509125). The 50 kDa band of fragmented 

PTGS2 has also previously been detected in AD brains (PMID:14724276).

2. Is COX2 post-translationally modified?

COX2 is a subject of post-translational modifications, including phosphorylation, glycosylation, and 

s-nitrosylation (PMID: 28939645).

3. What is the difference between COX1, COX2, and COX3?

There are three isoenzymes that have cyclooxygenase activity: COX1, COX2, and COX3. While COX1 

is a ubiquitously expressed constitutive enzyme, expression of COX2 is generally low but can be rapidly 

induced by various stimuli (as part of infection and inflammatory response) and is controlled by the 

transcription factor NFκB. COX3 is an alternative splice variant of COX1 enzyme and is considered 

non-functional in humans. 

4. I cannot detect COX2 in my sample during western blotting.

Unlike COX1, COX2 expression is inducible by a variety of stimuli including certain growth factors, cytokines, 

and proinflammatory stimuli. COX2 basal expression levels may be very low in unstimulated cells. Additionally, 

the COX2 half-life time is short and after stimulation, COX2 protein can be quickly degraded to basal levels 

(PMID: 10966456), which should be taken into account during experimental design.

5. What is the role of COX2 in cancer?

COX2 is often upregulated in various cancer types and increased expression of COX2 is associated with 

greater angiogenesis of solid tumors, increased invasion, and metastasis, as well as decreased host immunity.

6. What is subcellular localization of COX2?

Both COX1 and COX2 are present in the endoplasmic reticulum (ER) and nuclear envelope (PMID: 9545330), 

but COX2 has been reported to be more enriched in the nuclear envelope compared to COX1 (PMID: 7738031).


Product Specific Protocols
WB protocol for COX2/ Cyclooxygenase 2/ PTGS2 antibody 12375-1-APDownload protocol
IHC protocol for COX2/ Cyclooxygenase 2/ PTGS2 antibody 12375-1-APDownload protocol
IF protocol for COX2/ Cyclooxygenase 2/ PTGS2 antibody 12375-1-APDownload protocol
Standard Protocols
Click here to view our Standard Protocols



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The reviews below have been submitted by verified Proteintech customers who received an incentive forproviding their feedback.


Lena (Verified Customer) (02-21-2022)

Used for Paraffin-IHC from embedded mouse bones

  • Applications: Immunohistochemistry
  • Cell Tissue Type: IHC-P

Ryan (Verified Customer) (02-28-2019)

Tissue was fixed in PFA and no further antigen retrieval was necessary. Co-localisation in microglia shown with a known marker (magenta).

  • Applications: Immunohistochemistry, Immunofluorescence,
  • Primary Antibody Dilution: 1:100
  • Cell Tissue Type: Zebrafish brain (microglia) at 3dpf
COX2/ Cyclooxygenase 2/ PTGS2 Antibody Immunohistochemistry,Immunofluorescence, validation (1:100 dilution) in Zebrafish brain (microglia) at 3dpf (Cat no:12375-1-AP)