Endocrine - Pancreas Development
|Embryology - 19 May 2019 Expand to Translate|
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- 1 Introduction
- 2 Some Recent Findings
- 3 Pancreas Development
- 4 Human Pancreas Timeline
- 5 Fetal Pancreas
- 6 Developing Pancreatic Islets
- 7 Adult Pancreatic Islets
- 8 Islet size for Different Species
- 9 Hormones
- 10 Molecular
- 11 Pancreas Histology
- 12 Diabetes
- 13 Abnormalities
- 14 References
- 15 Additional Images
- 16 External Links
- 17 Glossary Links
The pancreas is a two-headed organ, not only in origin but also in function. In origin, the pancreas develops from two separate primordia. In function, the organ has both endocrine function in relation to regulating blood glucose (and also other hormone secretions) and gastrointestinal function as an exocrine (digestive) organ, see exocrine pancreas.
In recent years there has been much research due to the increasing incidence of diabetes in humans and the potential for stem cell therapeutics. Much is now known about the epithelial/mesenchymal and molecular regulation of pancres development.
At the foregut/midgut junction the septum transversum generates 2 pancreatic buds (dorsal and ventral endoderm) which will fuse to form the pancreas. The dorsal bud arises first and generates most of the pancreas. The ventral bud arises beside the bile duct and forms only part of the head and uncinate process of the pancreas.
In the fetal period islet cell clusters (icc) differentiate from pancreatic bud endoderm. These cell clusters form acini and ducts (exocrine). On the edge of these cell clusters pancreatic islets (endocrine) also form. Pancreatic hormonal function is mainly to secrete insulin and glucagon that together regulate blood glucose levels. Pancreatic progenitor cells give rise to five endocrine cell types secreting: insulin, glucagon, somatostatin, pancreatic polypeptide and ghrelin. Furthermore gastrin, secreted by stomach G-cells, is also embryonically expressed in the pancreas but disappears after birth.
The pancreas exocrine function begins after birth, while the endocrine function (hormone release) can be measured from 10 to 15 weeks onward. At this stage, it is not clear what the exact roles of these hormones are in regulating fetal growth.
- Functions - exocrine (amylase, alpha-fetoprotein), 99% by volume; endocrine (pancreatic islets) 1% by volume about 1 million islets
- Exocrine function - begins after birth
- Endocrine function - from 10 to 15 weeks onward hormone release
- exact roles of hormones in regulating fetal growth?
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
|These papers originally appeared in the Some Recent Findings table, but as that list grew in length have now been shuffled down to this collapsible table.
- Pancreatic buds - duodenal level endoderm, splanchnic mesoderm forms dorsal and ventral mesentery, dorsal bud (larger, first), ventral bud (smaller, later)
- Pancreas Endoderm - pancreas may be opposite of liver
- Heart cells promote/notochord prevents liver formation
- Notochord may promote pancreas formation
- Heart may block pancreas formation
- Duodenum growth/rotation - brings ventral and dorsal buds together, fusion of buds
- Pancreatic duct - ventral bud duct and distal part of dorsal bud, exocrine function
- Islet cells - cords of endodermal cells form ducts, from which cells bud off to form islets
Human Pancreas Timeline
|10||25-27||distal endoderm foregut|
|12||29-31||pancreatic duodenal endoderm
extra-hepatic billiard duct
|23||8 weeks +||fetal beta cell
|fetal||14 weeks||acinar cell|
|Table data Links: pancreas | exocrine pancreas | pancreas molecular timeline | timeline|
|Human (week 4) pancreatic buds||Human (week 8, Stage 22) pancreas|
- Week 7 to 20 - pancreatic hormones secretion increases, small amount maternal insulin
- Week 10 - glucagon (alpha) differentiate first, somatostatin (delta), insulin (beta) cells differentiate, insulin secretion begins
- Week 15 - glucagon detectable in fetal plasma
Mouse pancreas duct development cartoon
Pig embryo (14 mm CRL) (ventral and dorsal)
Fetal topographical anatomy of the pancreatic head and duodenum with special reference to courses of the pancreaticoduodenal arteries.
A diagram showing joining processes between the dorsal and ventral primordia of the pancreas as well as the hypothetical rotation of the duodenum along a left-right axis. Viewed from the posterosuperior side of the body. A horizontal plane including most parts of the duodenum is shown to emphasize, in contrast to adults, the course of the second portion (D2) directing posteriorly rather than inferiorly.
Developing Pancreatic Islets
|Model of endocrine cell and vessel organization in human islets||A α-Cells (green) and β-cells (red) are organized into a thick folded plate lined at both sides with vessels (blue).
Adult Pancreatic Islets
The adult pancreatic islets (Islets of Langerhans) contain four distinct endocrine cell types.
- glucagon, mobilizes lipid
- insulin, increase glucose uptake
- stimulate fetal growth, continue to proliferate to postnatal, in infancy most abundant
Molecular - Nkx6.1 - NK2 Homeobox 6.1
- homeobox (Hox) containing transcription factor contain a 60-amino acid evolutionarily conserved DNA-binding homeodomain.
- required for beta cells development and is completely conserved between rat, mouse, and human.
- somatostatin, inhibits glucagon, insulin secretion
- pancreatic polypeptide
Rat - pancreatic islet development
Islet size for Different Species
The following species comparison table has been slightly modified from Table 1 data from a review paper.
- Islet size is described as an effective diameter of a circle, which depicts the same area as a measured islet area.
- β-cell ratio is the area ratio of β-cells in an islet.
- Both data sets are expressed as the mean value with its standard deviation.
|Pancreas Islet Species Comparison|
|Species||Age||Islet size (μm)||β-cell ratio|
|Human||39 years (adult)||50 ± 29||0.64 ± 0.21|
|Monkey||1 year||67 ± 38*||0.79 ± 0.14*|
|Pig||6 month||49 ± 15a||0.89 ± 0.11*|
|Rabbit||6 month||64 ± 28*||0.79 ± 0.17*|
|Bird||40 day||24 ± 6*||0.46 ± 0.24*|
|Wild-type mouse||6 month||116 ± 80*||0.85 ± 0.14*|
|Pregnant mouse||3 month||112 ± 94*||0.84 ± 0.22*|
|ob/ob mouse||15 week||86 ± 76*||0.92 ± 0.11*|
|db/db mouse||15 week||47 ± 24b||0.53 ± 0.24c|
*p < 0.0001 ap = 0.65 bp = 0.42 cp = 0.0004 compared with human.
- Source - synthesized by the beta cells of the islets of Langerhans.
- 2 dissimilar polypeptide chains, A and B, which are linked by 2 disulphide bonds.
- both chains are derived from a 1-chain precursor, proinsulin.
- proinsulin - converted to insulin by the enzymatic removal of a segment that connects the amino end of the A chain to the carboxyl end of the B chain.
- Links: OMIM
- Source - synthesized by the alpha cells of the islets of Langerhans.
- 29-amino acid hormone
- human, rabbit, rat, pig, and cow proteins are identical.
- member of a multigene family that includes - secretin, vasoactive intestinal peptide, gastric inhibitory peptide, glicentin, and others.
- counteracts the glucose-lowering action of insulin
- stimulates glycogenolysis and gluconeogenesis.
- Links: OMIM
|Human Pancreas Molecular Timeline|
|Mouse Pancreas Cell Lineage
In this study mouse cell types were collected at different ages E11 and E15 pancreatic progenitors, E15 acinar cells, E15 endocrine progenitors (EP), E15, E17, P1, P15, 8–12 week beta cells, P1 and 8–12 week alpha cells, and adult duct cells. The following markers were used in determining the lineages, not both endocrine and exocrine cells derive from a common precursor.
Identification of pancreas cell lineages
Molecular Development of Endocrine Pancreas Cells
- Links: Molecular Development
- Pancreas Histology Links: overview (label) | exocrine (label) | endocrine (label) | blood vessels (label) | insulin (label) | overview | exocrine | endocrine | blood vessels | insulin | Islet labeled for insulin and Glucagon | Insulin (Fl) | Glucagon (Fl) | GIT Histology
Diabetes is a condition where pancreatic insulin is no longer produced in sufficient required amounts (or at all) meaning that glucose cannot be converted into energy, resulting in health issues related to blood sugar levels. There are two main types:
- Type 1 diabetes - (10% of all cases) most common chronic childhood condition. An auto-immune condition, where the immune system is activated to destroy the beta cells in the pancreas which produce insulin. Type 1 diabetes is not linked to modifiable lifestyle factors.
- Type 2 diabetes - (85–90% of all cases) most common in adults. A progressive condition in which the body becomes resistant to the normal effects of insulin and/or gradually loses the capacity to produce enough insulin in the pancreas. Type 2 diabetes is associated with modifiable lifestyle risk factors and has strong genetic and family related risk factors.
Secondary Health Issues:
- Diabetic retinopathy - is a leading cause of preventable blindness.
- Diabetic ketoacidosis (DKA) occurs among children and young people with type 1 diabetes and is 1.4 times higher in females.
Listed below are a number of pancreatic developmental abnormalities, see also the 2003 article "Lifetime consequences of abnormal fetal pancreatic development".
Accessory Pancreatic Tissue - pancreatic tissue located in associated gastrointestinal tract tissues/organs such as the wall of the stomach, duodenum, jejunum or Meckel's diverticulum.
Annular Pancreas - (1 in 7,000 people) pancreas forms as a "ring" of tissue surrounding the duodenum which is subsequently narrowed.
Diabetes Mellitus - Maternal diabetes (and hyperglycaemia) have been shown to lead to increased fetal islet hyperplasia of the insulin producing beta cells and insulin secretion.
Intrauterine growth restriction - can lead to a delayed development of the insulin producing beta cells and low insulin secretion.
Tumours - Serous Cystadenoma (endocrine tumour), Somatostatinoma (tumour of delta cell origin), intraductal papillary-mucinous neoplasm
Diabetic ketoacidosis (DKA) occurs among children and young people with type 1 diabetes and is 1.4 times higher in females.
- Scharfmann R, Xiao X, Heimberg H, Mallet J & Ravassard P. (2008). Beta cells within single human islets originate from multiple progenitors. PLoS ONE , 3, e3559. PMID: 18958289 DOI.
- Suissa Y, Magenheim J, Stolovich-Rain M, Hija A, Collombat P, Mansouri A, Sussel L, Sosa-Pineda B, McCracken K, Wells JM, Heller RS, Dor Y & Glaser B. (2013). Gastrin: a distinct fate of neurogenin3 positive progenitor cells in the embryonic pancreas. PLoS ONE , 8, e70397. PMID: 23940571 DOI.
- Ryu GR, Lee E, Kim JJ, Moon SD, Ko SH, Ahn YB & Song KH. (2018). Comparison of enteroendocrine cells and pancreatic β-cells using gene expression profiling and insulin gene methylation. PLoS ONE , 13, e0206401. PMID: 30379923 DOI.
- Scavuzzo MA, Hill MC, Chmielowiec J, Yang D, Teaw J, Sheng K, Kong Y, Bettini M, Zong C, Martin JF & Borowiak M. (2018). Endocrine lineage biases arise in temporally distinct endocrine progenitors during pancreatic morphogenesis. Nat Commun , 9, 3356. PMID: 30135482 DOI.
- Vieira A, Vergoni B, Courtney M, Druelle N, Gjernes E, Hadzic B, Avolio F, Napolitano T, Navarro Sanz S, Mansouri A & Collombat P. (2018). Neurog3 misexpression unravels mouse pancreatic ductal cell plasticity. PLoS ONE , 13, e0201536. PMID: 30092080 DOI.
- Rovira M, Huang W, Yusuff S, Shim JS, Ferrante AA, Liu JO & Parsons MJ. (2011). Chemical screen identifies FDA-approved drugs and target pathways that induce precocious pancreatic endocrine differentiation. Proc. Natl. Acad. Sci. U.S.A. , 108, 19264-9. PMID: 22084084 DOI.
- Landsman L, Nijagal A, Whitchurch TJ, Vanderlaan RL, Zimmer WE, Mackenzie TC & Hebrok M. (2011). Pancreatic mesenchyme regulates epithelial organogenesis throughout development. PLoS Biol. , 9, e1001143. PMID: 21909240 DOI.
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- Suckale J & Solimena M. (2008). Pancreas islets in metabolic signaling--focus on the beta-cell. Front. Biosci. , 13, 7156-71. PMID: 18508724
- Jennings RE, Berry AA, Kirkwood-Wilson R, Roberts NA, Hearn T, Salisbury RJ, Blaylock J, Piper Hanley K & Hanley NA. (2013). Development of the human pancreas from foregut to endocrine commitment. Diabetes , 62, 3514-22. PMID: 23630303 DOI.
- Jin ZW, Yu HC, Cho BH, Kim HT, Kimura W, Fujimiya M & Murakami G. (2010). Fetal topographical anatomy of the pancreatic head and duodenum with special reference to courses of the pancreaticoduodenal arteries. Yonsei Med. J. , 51, 398-406. PMID: 20376893 DOI.
- Bosco D, Armanet M, Morel P, Niclauss N, Sgroi A, Muller YD, Giovannoni L, Parnaud G & Berney T. (2010). Unique arrangement of alpha- and beta-cells in human islets of Langerhans. Diabetes , 59, 1202-10. PMID: 20185817 DOI.
- Cabrera-Vásquez S, Navarro-Tableros V, Sánchez-Soto C, Gutiérrez-Ospina G & Hiriart M. (2009). Remodelling sympathetic innervation in rat pancreatic islets ontogeny. BMC Dev. Biol. , 9, 34. PMID: 19534767 DOI.
- Kim A, Miller K, Jo J, Kilimnik G, Wojcik P & Hara M. (2009). Islet architecture: A comparative study. Islets , 1, 129-36. PMID: 20606719 DOI.
- Benitez CM, Qu K, Sugiyama T, Pauerstein PT, Liu Y, Tsai J, Gu X, Ghodasara A, Arda HE, Zhang J, Dekker JD, Tucker HO, Chang HY & Kim SK. (2014). An integrated cell purification and genomics strategy reveals multiple regulators of pancreas development. PLoS Genet. , 10, e1004645. PMID: 25330008 DOI.
- Holemans K, Aerts L & Van Assche FA. (2003). Lifetime consequences of abnormal fetal pancreatic development. J. Physiol. (Lond.) , 547, 11-20. PMID: 12562919 DOI.
- Pancreas The official journal of the American Pancreatic Association and the Japan Pancreas Society | PubMed
- Pancreatology Official Journal of the International Association of Pancreatology (IAP); European Pancreatic Club (EPC)and 16 other societies and study groups.
- Journal of the Pancreas electronic journal of pancreatology
- Diabetologia | PubMed
Endocrinology: An Integrated Approach Nussey, S.S. and Whitehead, S.A. Oxford, UK: BIOS Scientific Publishers, Ltd; 2001. table of Contents
NIH Genes & Disease Chapter 41 - Endocrine
Pathophysiology of the Endocrine System The Endocrine Pancreas
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Molecular Biology of the Cell (4th Edn) Alberts, Bruce; Johnson, Alexander; Lewis, Julian; Raff, Martin; Roberts, Keith; Walter, Peter. New York: Garland Publishing; 2002. table 15-1. Some Hormone-induced Cell Responses Mediated by Cyclic AMP
Health Services/Technology Assessment Text (HSTAT) Bethesda (MD): National Library of Medicine (US), 2003 Oct.
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Honoré C, Rescan C, Hald J, McGrath PS, Petersen MB, Hansson M, Klein T, Østergaard S, Wells JM & Madsen OD. (2016). Revisiting the immunocytochemical detection of Neurogenin 3 expression in mouse and man. Diabetes Obes Metab , 18 Suppl 1, 10-22. PMID: 27615127 DOI.
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Search April 2010
- Endocrine Development - All (14277) Review (4620) Free Full Text (3140)
Search Pubmed: pancreas development
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- F1000 Reports - Recent advances in pancreas development
- Howard Hughes Medical Institute - Seung Kim Lab
- Australian Institute of Health and Welfare - [Factsheet - Diabetic ketoacidosis (DKA) among children and young people with type 1 diabetes]
- Diabetes Australia - Type 1 Diabetes | Type 2 Diabetes
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Cite this page: Hill, M.A. (2019, May 19) Embryology Endocrine - Pancreas Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Endocrine_-_Pancreas_Development
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