Incretin polypeptide hormone
GIP
GIP is an intestinal hormone known historically as gastric inhibitory polypeptide and also as glucose-dependent insulinotropic polypeptide. Both names refer to the same hormone but emphasize different research questions.
This is a research reference, not a product offered in the Asciende catalog. Published studies do not establish the identity, purity or availability of a commercial preparation.
Ligand, receptor and formulation
Keep entity and method together: transferring a result between formulations requires evidence even when their names overlap.
- Is the experimental entity the hormone, a fragment, an analog or a complete formulation?
- Does the readout measure receptor binding, an intracellular signal or an outcome in another system?
- Are species, expressed receptor, comparator and readout time reported?
Mechanism described in the literature
In cellular models, expression of the GIP receptor enabled observation of cyclic AMP production and calcium accumulation after ligand exposure. These assays characterize receptor signaling rather than all the hormone's metabolic consequences.
Other names in the literature
- Glucose-dependent insulinotropic polypeptide
- Gastric inhibitory polypeptide
From the cloned receptor to tissue
The 1993 publication combined functional receptor expression with mapping of its messenger RNA. According to the literature, expression signals appeared in several organs and brain regions. Finding a transcript opened new questions but did not demonstrate a specific physiological function at every location.
What receptor absence showed
A 2002 study compared mice with and without the GIP receptor on a high-fat diet. In animal models, receptor absence was associated with less adiposity accumulation and differences in substrate utilization. Animals with another genetic alteration related to energy balance were also examined.
Genetic loss and ligand exposure
Deleting a receptor during development and experimentally exposing a system to a molecule are different interventions. The genetic study helps identify GIP-system involvement but cannot by itself predict the behavior of every agonist, antagonist or combined analog. This distinction prevents a mouse observation from becoming a general rule.
Questions and answers
Are GIP and GLP-1 the same incretin?
No. They are different hormones. Membership of a common physiological category does not make their receptors or experimental materials equivalent.
Does a receptor-deficient mouse reproduce an antagonist experiment?
Not necessarily. Intervention duration, development of the system and comparison conditions differ.
Sources
- Gastric inhibitory polypeptide receptor, a member of the secretin-vasoactive intestinal peptide receptor family, is widely distributed in peripheral organs and the brain. — Endocrinology, 1993
- Gastric inhibitory polypeptide receptor, a member of the secretin-vasoactive intestinal peptide receptor family, is widely distributed in peripheral organs and the brain.
- Inhibition of gastric inhibitory polypeptide signaling prevents obesity. — Nat Med, 2002
- Inhibition of gastric inhibitory polypeptide signaling prevents obesity.