A stable analogue of glucose-dependent insulinotropic polypeptide, GIP(LysPAL16), enhances functional differentiation of mouse embryonic stem cells into cells expressing islet-specific genes and hormones.
Embryonic stem (ES) cells can be differentiated into insulin-producing cells by conditioning the culture media. However, the number of insulin-expressing cells and amount of insulin released is very low. Glucose-dependent insulinotropic polypeptide (GIP) enhances the growth and differentiation of pancreatic beta-cells. This study examined the potential of the stable analogue GIP(LysPAL16) to enhance the differentiation of mouse ES cells into insulin-producing cells using a five-stage culturing strategy. Semi-quantitative PCR indicated mRNA expression of islet development markers (nestin, Pdx1, Nkx6.1, Oct4), mature pancreatic beta-cell markers (insulin, glucagon, Glut2, Sur1, Kir6.1) and the GIP receptor gene GIP-R in undifferentiated (stage 1) cells, with increasing levels in differentiated stages 4 and 5. IAPP and somatostatin genes were only expressed in differentiated stages. Immunohistochemical studies confirmed the presence of insulin, glucagon, somatostatin and IAPP in differentiated ES cells. After supplementation with GIP(LysPAL16), ES cells at stage 4 released insulin in response to secretagogues and glucose in a concentration-dependent manner, with 35-100% increases in insulin release. Cellular C-peptide content also increased by 45% at stages 4 and 5. We conclude that the stable GIP analogue enhanced differentiation of mouse ES cells towards a phenotype expressing specific beta-cell genes and releasing insulin.
Marenah
Lamin
L
School of Biomedical Sciences, University of Ulster, Coleraine BT52 1SA, Northern Ireland, UK.
McCluskey
Jane T
JT
Abdel-Wahab
Yasser H A
YH
O'Harte
Finbarr P M
FP
McClenaghan
Neville H
NH
Flatt
Peter R
PR
D000818:Animals; D001483:Base Sequence; D002454:Cell Differentiation / Q000187:drug effects*; D002460:Cell Line; D017931:DNA Primers; D004622:Embryo, Mammalian / Q000166:cytology / Q000187:drug effects*; D005749:Gastric Inhibitory Polypeptide / Q000494:pharmacology*; D007150:Immunohistochemistry; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000166:cytology / Q000378:metabolism*; D051379:Mice; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000166:cytology / Q000187:drug effects*
D017931:DNA Primers; D007328:Insulin; C508994:glucose-dependent insulinotropic polypeptide, epsilon-palmitoyl-Lys(16)-; D005749:Gastric Inhibitory Polypeptide