Abstract
Immunoreactive gastric inhibitory polypeptide (IR-GIP) from human and porcine intestine was quantified by radioimmunoassay and the molecular forms characterised by gel permeation and reverse-phase high pressure liquid chromatography (HPLC). Gel filtration revealed two major immunoreactive peaks corresponding to the previously described 5-kDa and 8-kDa molecular forms, which appeared similar in both species. Isocratic reverse-phase HPLC revealed that the major immunoreactive GIP peak (5-kDa) in the human tissue eluted earlier than the corresponding porcine molecular form, indicating the latter to be less hydrophobic. These findings suggest significant species differences between human and porcine GIP.
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