Human Proinsulin ELISA Kit (48-well)

CAT#: EA100061

Human Proinsulin ELISA Kit (48-well)

Product Images

Representative standard curve for Proinsulin ELISA. Proinsulin was diluted in serial two-fold steps in Sample Diluent.

Specifications

Product Data

• Format: 48-well strip plate
• Assay Type: Solid Phase Sandwich ELISA
• Assay Length: 3 hours
• Signal: Colorimetric
• Curve Range: 156.25-10000pg/ml
• Sample Type: Cell culture supernatant, serum, plasma (EDTA, citrate, heparin)
• Sample Volume: 20 uL
• Specificity: Natural and recombinant Human Proinsulin Ligand
• Sensitivity: 70pg/mL
• Reactivities: Human
• Interference: No significant interference observed with available related molecules.
• Components:
  • Aluminium pouches with a Microwell Plate coated with antibody to human Proinsulin (8X6)
  • 2 vials human Proinsulin Standard lyophilized, 1000 pg/ml upon reconstitution
  • 2 vials concentrated Biotin-Conjugate anti-human Proinsulin antibody
  • 2 vials Streptavidin-HRP solution
  • 4 bottle Standard /sample Diluent
  • 1 bottle Biotin-Conjugate antibody Diluent
  • 1 bottle Streptavidin-HRP Diluent
  • 1 bottle Wash Buffer Concentrate 20x (PBS with 1% Tween-20)
  • 1 vial Substrate Solution
  • 1 vial Stop Solution
  • 4 pieces Adhesive Films
  • package insert
• Background:

  Proinsulin is synthesized as a single chain, 110 amino acid (aa) preproprecursor that contains a 24 aa signal sequence and an 86 aa proinsulin propeptide. Following removal of the signal peptide, the proinsulin peptide undergoes further proteolysis to generate mature insulin, a 51 aa disulfidelinked dimer that consists of a 30 aa B chain (aa 2554) bound to a 21 aa A chain (aa 90110). The 34 aa intervening peptide (aa 5589)that connects the B and A chains is termed the Cpeptide.

  Human proinsulin shares 84% and 80% aa sequence identity with rat and bovine proinsulin, respectively. Most of the sequence variation between species occurs in the region of the Cpeptide. This peptide generates a structural conformation that allows for the correct formation of the intrachain disulphide bonds . Insulin is a molecule that facilitates the cellular uptake of glucose. This is accomplished by regulating the appearance of membrane glucose transporters. Low insulin levels or lack of insulin are associated with type 2 and type 1 diabetes mellitus, respectively. These conditions are associated with an increased risk for microvascular complications such as retinopathy, nephropathy, and peripheral neuropathy . Proinsulin also circulates, but its physiologic role is less well understood. It does possess about 25% of the activity of mature insulin, but it would seem unlikely to be a natural substitute for insulin . In type 2 diabetes, an elevated proinsulin to insulin ratio in the circulation is a well known abnormality . Perhaps this abnormality represents either compromised proteolytic processing or a general inability to process increased levels of insulin precursor . In any event, proinsulin will stimulate amylin secretion by .cells, and amyloid formation in pancreatic islets that promotes decreased . cell function . Studies also suggest that fasting serum proinsulin may be a better predictor of future type 2 diabetes than fasting insulin levels in obese children .

• Gene Symbol: INS
• Standard Curve:
  
  Representative standard curve for Proinsulin ELISA. Proinsulin was diluted in serial two-fold steps in Sample Diluent.