Introduction
Pancreatitis-associated protein (PAP), absent in the healthy pancreas, is highly induced during acute pancreatitis. Although exhibiting anti-bacterial and antiapoptotic properties in vitro, its precise in vivo function remains unclear. Studies using anti-sense oligonucleotides to suppress PAP expression in a rat model led to exacerbated pancreatitis. PAP released from the pancreas during pancreatitis may contribute to lung inflammation by stimulating hepatic TNF-alpha production, subsequently elevating circulating TNF-alpha levels.
PAP is activated in primary liver cancers. Notably, it's absent in mature hepatocytes of a healthy liver but found in specific ductular cells, suggesting potential hepatic progenitor cells. PAP might function as a hepatic cytokine with combined mitogenic and anti-apoptotic effects on hepatocytes, effectively acting as an in vivo growth factor for enhanced liver regeneration. In pancreatic cancer, PAP overexpression was observed in 79% (30/38) of pancreatic ductal adenocarcinoma cases, 19% (7/36) of chronic pancreatitis cases, and 29% (2/7) of mucinous cystadenoma cases. PAP was detected in malignant ductular structures within pancreatic carcinomas, as well as in benign proliferating ductules and acinar cells in chronic pancreatitis. Elevated PAP levels in pancreatic cancer patients are not solely attributed to concurrent pancreatitis but appear linked to increased production by cancer cells, correlating with tumor burden as per UICC stages.
Epithelial PAP expression is induced during intestinal mucosal inflammation triggered by commensal bacteria or DSS exposure, mirroring observations in inflamed IBD colon. Elevated serum PAP levels (> 50 ng/mL) serve as a diagnostic marker for ileal Crohn's disease with 60% sensitivity, 94% specificity, 84% positive predictive value, and 81% negative predictive value. This elevated serum PAP is significantly associated with both disease activity and ileal involvement in Crohn's disease.
Description
This antibody was generated by immunizing rabbits with a recombinant human REG3A protein. The recombinant protein's amino acid sequence shares 100% homology with the human REG3A sequence. The 18.4 kDa immunization antigen comprises 149 amino acid residues and a His Tag.
Species Reactivity
Reacts with human.
Titer
Evaluated via indirect ELISA, the titer is defined as follows: >1:100,000 for an antibody concentration of 1 mg/ml, using 25 ng of coated antigen per well. This determination is made at the point of maximum decrease on the titration curve.
Physical Appearance
Supplied as a sterile, filtered, white lyophilized (freeze-dried) powder.
Formulation
The antibody solution undergoes sterile filtration and is lyophilized from a 1 mg/ml concentration in a buffer composed of 0.05M Phosphate, 0.1M NaCl, at pH 7.2.
Solubility
To reconstitute, add 0.1 ml of deionized water to the lyophilized pellet and allow it to dissolve completely. Minor turbidity after reconstitution is acceptable and does not affect antibody activity. Should turbidity occur, centrifuge the solution to clarify.
Stability
Store the lyophilized antibody at -20°C. After reconstitution, aliquot the product to minimize freeze-thaw cycles and store frozen at -80°C. Reconstituted antibody remains stable at 4°C for a limited duration, showing no significant change over a two-week period at this temperature.
Synonyms
Regenerating islet-derived protein 3 alpha, Reg III-alpha, Pancreatitis-associated protein 1, REG3A, HIP, PAP, PAP1, REG3, INGAP, PAP-H, PBCGF, REG-III.
Purification Method
Immunoaffinity chromatography on a column with immobilized recombinant human REG3A.
Type
Polyclonal Rabbit Antibody.
Immunogen
MRGSHHHHHH GMASHMEEPQ RELPSARIRC PKGSKAYGSH CYALFLSPKS WTDADLACQK RPSGNLVSVL SGAEGSFVSS LVKSIGNSYS YVWIGLHDPT QGTEPNGEGW EWSSSDVMNY FAWERNPSTI SSPGHCASLS RSTAFLRWKD YNCNVRLPYV CKFTD.