1. Schmidt WE, Siegel EG, Creutzfeldt W. Glucagon-like peptide-1 but not glucagon-like peptide-2 stimulates insulin release from isolated rat pancreatic islets. Diabetologia 1985; 28: 704–707.
2. Kreymann B, Williams G, Ghatei MA, et al. Glucagon-like peptide-1 7–36: a physiological incretin in man. Lancet 1987; 2: 1300–1304.
3. Brown JC, Pederson RA, Jorpes E, et al. Preparation of highly active enterogastrone. Can J Physiol Pharmacol 1969; 47: 113–114.
4. Brown JC, Mutt V, Pederson RA. Further purification of a polypeptide demonstrating enterogastrone activity. J Physiol 1970; 209: 57–64.
5. Creutzfeldt W, Ebert R. New developments in the incretin concept. Diabetologia 1985; 28: 565–573.
6. Creutzfeldt W. The incretin concept today. Diabetologia 1979; 16: 75–85.
7. Meier JJ, Nauck MA. Glucagon-like peptide 1 (GLP-1) in biology and pathology. Diabetes Metab Res Rev 2005; 21: 91–117.
8. Drucker DJ. Glucagon-like peptides. Diabetes 1998; 47: 159–169.
9. Dupre J, Ross SA, Watson D, et al. Stimulation of insulin secretion by gastric inhibitory polypeptide in man. J Clin Endocrinol Metab 1973; 37: 826–828.
10. Takemura J, Seino Y, Yamamura T, et al. The role of endogenous gastric inhibitory polypeptide in the enteroinsular axis. J Clin Endocrinol Metab 1982; 54: 909–913.
11. Adrian TE, Soltesz G, MacKenzie IZ, et al. Gastrointestinal and pancreatic hormones in the human fetus and mother at 18–21 weeks of gestation. Biol Neonate 1995; 67: 47–53.
12. Otonkoski T, Hayek A. Constitution of a biphasic insulin response to glucose in human fetal pancreatic beta-cells with glucagon-like peptide 1. J Clin Endocrinol Metab 1995; 80: 3779–3783.
13. Jackson Huang TH, Brubaker PL. Synthesis and secretion of glucagon-like peptide-1 by fetal rat intestinal cells in culture. Endocrine 1995; 3: 499–503.
14. Burrin DG, et al. Trophic factors and regulation of gastrointestinal tract and liver development. In: Polin RA, Abman SH, Rowitch DH), (eds). Fetal and neonatal physiology, 5th edn. Elsevier, Philadelphia, 2017; 855–860.
15. Ross MG, Nijland MJM. Development of ingestive behavior. Am J Physiol 1998; 274: R879–R893.
16. Sangild PT. Gut responses to enteral nutrition in preterm infants and animals. Exp Biol Med 2006; 231: 1695–1711.
17. Mann SE, Nijland MJM, Ross MG. Mathematical modeling of human amniotic fluid dynamics. Am J Obstet Gynecol 1996; 175: 937–944.
18. Abramovich DR. Fetal factors influencing the volume and composition of liquor amnii. J Obstet Gynaecol Br Commonw 1970; 77: 865–877.
19. Pritchard JA. Deglutition of normal and anencephalic fetuses. Obstet Gynecol 1965; 25: 289–297.
20. Kawamata R, Suzuki Y, Yada Y, et al. Gut hormone profiles in preterm and term infants during the first 2 months of life. J Pediatr Endocrinol Metab 2014; 27: 717– 723.
21. Kirshon B, Rosenfeld B, Mari G, et al. Amniotic fluid glucose and intraamniotic infection. Am J Obstet Gynecol 1991; 164: 818–820.
22. Velika B, Birkova A, Dudic R, et al. Selected physicochemical properties of amniotic fluid according to week of pregnancy. Bratisl Lek Listy 2018; 119: 175–179.
23. Das SK, Foster HW, Adhikary PK, et al. Gestational variation of fatty acid composition of human amniotic fluid lipids. Obstet Gynecol 1975; 45: 425–432.
24. Anini Y, Hansotia T, Brubaker PL. Muscarinic receptors control postprandial release of glucagon-like peptide-1: in vivo and in vitro studies in rats. Endocrinology 2002; 143: 2420–2426.
25. Gameiro A, Reimann F, Habib AM, et al. The neurotransmitters glycine and GABA stimulate glucagon-like peptide-1 release from the GLUTag cell line. J Physiol 2005; 569: 761–772.
26. Ripken D, van der Wielen N, Wortelboer HM, et al. Nutrient- induced glucagon like peptide-1 release is modulated by serotonin. J Nutr Biochem 2016; 32: 142–150.
27. Flock GB, Cao X, Maziarz M, et al. Activation of enteroendocrine membrane progesterone receptors promotes incretin secretion and improves glucose tolerance in mice. Diabetes 2013; 62: 283–290.
28. Lim GE, Huang GJ, Flora N, et al. Insulin regulates glucagon- like peptide-1 secretion from the enteroendocrine L cell. Endocrinology 2009; 150: 580–591.
29. Kahles F, Meyer C, Diebold S, et al. Glucose-dependent insulinotropic peptide secretion is induced by inflammatory stimuli in an interleukin-1-dependent manner in mice. Diabetes Obes Metab 2016; 18: 1147–1151.
30. Ellingsgaard H, Hauselmann I, Schuler B, et al. Interleukin-6 enhances insulin secretion by increasing glucagon-like peptide-1 secretion from L cells and alpha cells. Nat Med 2011; 17: 1481–1489.
31. Yavropoulou MP, Kotsa K, Kesisoglou I, et al. Intracerebroventricular infusion of neuropeptide Y increases glucose dependent-insulinotropic peptide secretion in the fasting conscious dog. Peptides 2008; 29: 2281–2285.
32. Yavropoulou MP, Kotsa K, Kesisoglou I, et al. Effect of intracerebroventricular infusion of neurotensin on glucose- dependent insulinotropic peptide secretion in dogs. Peptides 2010; 31: 150–154.
33. Yavropoulou MP, Kotsa K, Anastasiou OE, et al. Intracerebroventricular infusion of bombesin modulates GIP secretion in conscious dogs. Neuropharmacology 2010; 58: 226–232.
34. Kalhan SC, et al. Metabolism of glucose and methods of investigation in the fetus and newborn. In: Polin RA, Abman SH, Rowitch DH), (eds). Fetal and neonatal physiology, 5th edn. Elsevier, Philadelphia, 2017; 390–403.
35. Yabe D, Seino Y. Incretin actions beyond the pancreas: lessons from knockout mice. Curr Opin Pharmacol 2013; 13: 946–953.
36. Seino Y, Yabe D. Glucose-dependent insulinotropic polypeptide and glucagon-like peptide-1: incretin actions beyond the pancreas. J Diabetes Investig 2013; 4: 108–130.
37. Campbell JE, Drucker DJ. Pharmacology, physiology, and mechanisms of incretin hormone action. Cell Metab 2013; 17: 819–837.
38. Niwa S, Mezawa H, Kobayashi N, et al. Inverse association between maternal 25OHD level and cord GLP-1/GIP concentrations. Pediatr Res 2016; 79: 536–542.