IGF-II/IGF2 Antibody (122404) [Alexa Fluor® 350]

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Product Details

Summary
Applications WB, ELISA(Cap), ELISA(Det)
Clone
122404
Clonality
Monoclonal
Host
Rat
Conjugate
Alexa Fluor 350

Order Details

IGF-II/IGF2 Antibody (122404) [Alexa Fluor® 350] Summary

Immunogen
E. coli-derived recombinant mouse IGF-II/IGF2
Ala25-Glu91
Accession # P09535
Specificity
Detects mouse IGF-II/IGF2 in ELISAs and Western blots. In ELISAs, this antibody shows less than 6% cross-reactivity with recombinant human (rh) IGF‑I R and no cross‑reactivity with rhIGF-I and rmIGF-I is observed. In Western blots, 100% cross-re
Isotype
IgG2a
Clonality
Monoclonal
Host
Rat
Purity Statement
Protein A or G purified
Innovator's Reward
Test in a species/application not listed above to receive a full credit towards a future purchase.

Packaging, Storage & Formulations

Storage
Protect from light. Do not freeze. 12 months from date of receipt, 2 to 8 °C as supplied
Buffer
Supplied 0.2mg/ml in 1X PBS with RDF1 and 0.09% Sodium Azide

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Background

IGF-II (Insulin-like growth factor II; also multiplication-stimulating polypeptide/MSP and somatomedin-A) is a secreted 8 kDa polypeptide that belongs to the insulin family of peptide growth factors (1, 2, 3). It is part of a complex system of growth and metabolic-regulating proteins that is particularly important during development. It has been associated with nervous system proliferation and differentiation, myelination, adrenal cortical proliferation, and skeletal growth and differentiation (4). In human, IGF-II is primarily synthesized by the liver, and circulates at high levels in both fetus and adult. In rodent, however, IGF-II levels drop after the perinatal period, an effect attributed to the lack of a key gene promoter (2, 5). This may indicate that postnatally, IGF-II has either a limited, or local effect only in rodent. For example, evidence suggests IGF-II may be the intermediary for SHH induction of VEGF attendant with local neovascularization (6). Rodent cells known to express IGF-II include astrocytes (7), hepatocytes (8), osteoblasts (9), embryonic striated muscle cells (10, 11) plus Kupffer cells and Ito cells (12). Mouse IGF-II is synthesized as a 180 amino acid (aa) preproprecursor (13). It contains a 24 aa signal sequence, a 67 aa mature region, and an 89 aa C-terminal prodomain that is alternatively referred to as the E-peptide. Mature IGF-II is 91% and 97% aa identical to human and rat IGF-II, respectively. Proper processing of IGF-II requires the chaperone activity of GRP94 (14). This generates an 8 kDa mature form, an 18 kDa, 156 aa proform, and a potential 11 kDa, 88 aa “Big” form (aa 25-112). This 11 kDa ”Big” form would be equivalent to human 15-16 kDa IGF-II, with the 5 kDa difference attributable to the presence of O-linked glycosylation (15). There is an additional 34 aa proteolytic fragment that is termed preptin and contains aa 93-126 of the preproprecursor. This is distinct from IGF-II, is secreted by pancreatic B cells, and facilitates insulin secretion (16, 17). IGF-II has multiple binding partners. It binds to IGF-IR, the Insulin receptor (IR)-type A and IGF-IR:IR-A hybrids, the type 2 IGF receptor (IGF-2R), and IGF binding proteins 1-6 (18, 19). The first three receptors initiate downstream signaling events, the IGF-2R sequesters local IGF‑II, and the six IGFBPs regulate IGF-II activity in various tissues.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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