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Isolation and sequence determination of rat islet amyloid polypeptide
J Asai1, M Nakazato, K Kangawa
1Third Department of Internal Medicine, Miyazaki Medical College, Japan.
Biochemical and Biophysical Research Communications
|October 16, 1989
Summary
Researchers isolated rat islet amyloid polypeptide (IAPP), a 37-amino acid hormone, finding it 84% identical to human IAPP. This discovery aids in understanding IAPP
Area of Science:
- Biochemistry
- Endocrinology
- Molecular Biology
Background:
- Islet amyloid polypeptide (IAPP) is a key hormone involved in glucose homeostasis.
- Human IAPP aggregation is linked to type 2 diabetes pathogenesis.
- Limited information exists on rodent IAPP structure and function.
Purpose of the Study:
- To isolate and characterize rat islet amyloid polypeptide (IAPP).
- To compare the sequence of rat IAPP with human IAPP and related peptides.
Main Methods:
- Radioimmunoassay (RIA) utilizing cross-reactivity with human IAPP antibodies.
- Amino acid sequencing of purified rat IAPP.
Main Results:
- Rat IAPP was successfully isolated from rat pancreata.
- Rat IAPP is a 37-amino acid polypeptide with a C-terminal tyrosine amide.
- Rat IAPP shares 84% sequence identity with human IAPP, with conserved N- and C-terminal regions.
- Rat IAPP exhibits 51% sequence identity to alpha and beta rat calcitonin gene-related peptides.
Conclusions:
- Rat IAPP shares significant structural similarity with human IAPP.
- The conserved regions suggest functional importance in IAPP biology.
- Rat IAPP serves as a valuable model for studying IAPP-related research, including diabetes.