Endocrine - Pancreas Development
|Embryology - 26 Feb 2017 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 Gastrointestinal Tract - Pancreas Development.
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 pancratic 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 to secrete insulin and glucagon which together regulate blood glucose levels and also somaostatin.
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
- Exocrine function - begins after birth
- Endocrine function - from 10 to 15 weeks onward hormone release
- exact roles of hormones in regulating fetal growth?
|Endocrine Links: Introduction | BGD Lecture | Science Lecture | Pineal | Hypothalamus | Pituitary | Thyroid | Parathyroid | Thymus | Pancreas | Adrenal | Gonad | Placenta | Other Tissues | Stage 22 | Abnormalities | Hormones | Category:Endocrine|
Some Recent Findings
|More recent papers|
This table shows an automated computer PubMed search using the listed sub-heading term.
References listed on the rest of the content page and the associated discussion page (listed under the publication year sub-headings) do include some editorial selection based upon both relevance and availability.
Clarice Machado-Santos, Júlio Cesar Fraulob Aquino, Patrício Adriano da Rocha, Marcelo Abidu-Figueiredo, Lycia de Brito-Gitirana, Armando Sales Influence of feeding habits in the endocrine pancreas of insectivore bat Pteronotus personatus and nectarivore bat Anoura geoffroyi: A comparative stereological and immunohistochemical study. Tissue Cell: 2017; PubMed 28109546
Daphne Yau, Elisa De Franco, Sarah E Flanagan, Sian Ellard, Miriam Blumenkrantz, John J Mitchell Case report: maternal mosaicism resulting in inheritance of a novel GATA6 mutation causing pancreatic agenesis and neonatal diabetes mellitus. Diagn Pathol: 2017, 12(1);1 PubMed 28049534
Lei Wang, Jianwei Xu, Dong Sun, Zongli Zhang Aberrant hepatic arteries running through pancreatic parenchyma encountered during pancreatoduodenectomy: Two rare case reports and strategies for surgical treatment. Medicine (Baltimore): 2016, 95(49);e3867 PubMed 27930504
Magdalena Kowalska, Mateusz Hermyt, Weronika Rupik Three-dimensional reconstruction of the embryonic pancreas in the grass snake Natrix natrix L. (Lepidosauria, Serpentes) based on histological studies. Zoology (Jena): 2016; PubMed 27889104
Rekha Lalwani, Sunita Athavale, Sheetal Kotgirwar A Rare Anomaly of Duodenum: A Case Report. Acta Med Iran: 2016, 54(10);686-689 PubMed 27888599
- 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
- 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 in a recent paper by Kim etal., 2009.
- 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.
|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
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.
- Raphaël Scharfmann, Xiangwei Xiao, Harry Heimberg, Jacques Mallet, Philippe Ravassard Beta cells within single human islets originate from multiple progenitors. PLoS ONE: 2008, 3(10);e3559 PubMed 18958289 | PLoS ONE
- Yaron Suissa, Judith Magenheim, Miri Stolovich-Rain, Ayat Hija, Patrick Collombat, Ahmed Mansouri, Lori Sussel, Beatriz Sosa-Pineda, Kyle McCracken, James M Wells, R Scott Heller, Yuval Dor, Benjamin Glaser Gastrin: a distinct fate of neurogenin3 positive progenitor cells in the embryonic pancreas. PLoS ONE: 2013, 8(8);e70397 PubMed 23940571 | PLoS One.
- Meritxell Rovira, Wei Huang, Shamila Yusuff, Joong Sup Shim, Anthony A Ferrante, Jun O Liu, Michael J Parsons Chemical screen identifies FDA-approved drugs and target pathways that induce precocious pancreatic endocrine differentiation. Proc. Natl. Acad. Sci. U.S.A.: 2011, 108(48);19264-9 PubMed 22084084 | Proc Natl Acad Sci U S A.
- Limor Landsman, Amar Nijagal, Theresa J Whitchurch, Renee L Vanderlaan, Warren E Zimmer, Tippi C Mackenzie, Matthias Hebrok Pancreatic mesenchyme regulates epithelial organogenesis throughout development. PLoS Biol.: 2011, 9(9);e1001143 PubMed 21909240 | PLoS Biol.
- Petra Dames, Ramona Puff, Michaela Weise, Klaus G Parhofer, Burkhard Göke, Magdalena Götz, Jochen Graw, Jack Favor, Andreas Lechner Relative roles of the different Pax6 domains for pancreatic alpha cell development. BMC Dev. Biol.: 2010, 10;39 PubMed 20377917
- Zhe Wu Jin, Hee Chul Yu, Baik Hwan Cho, Hyoung Tae Kim, Wataru Kimura, Mineko Fujimiya, Gen Murakami Fetal topographical anatomy of the pancreatic head and duodenum with special reference to courses of the pancreaticoduodenal arteries. Yonsei Med. J.: 2010, 51(3);398-406 PubMed 20376893 | Yonsei Med J.
- Domenico Bosco, Mathieu Armanet, Philippe Morel, Nadja Niclauss, Antonino Sgroi, Yannick D Muller, Laurianne Giovannoni, Géraldine Parnaud, Thierry Berney Unique arrangement of alpha- and beta-cells in human islets of Langerhans. Diabetes: 2010, 59(5);1202-10 PubMed 20185817 | PMC2857900 | Diabetes.
- Siraam Cabrera-Vásquez, Víctor Navarro-Tableros, Carmen Sánchez-Soto, Gabriel Gutiérrez-Ospina, Marcia Hiriart Remodelling sympathetic innervation in rat pancreatic islets ontogeny. BMC Dev. Biol.: 2009, 9;34 PubMed 19534767
- Abraham Kim, Kevin Miller, Junghyo Jo, German Kilimnik, Pawel Wojcik, Manami Hara Islet architecture: A comparative study. Islets: 2010, 1(2);129-36 PubMed 20606719
- K Holemans, L Aerts, F A Van Assche Lifetime consequences of abnormal fetal pancreatic development. J. Physiol. (Lond.): 2003, 547(Pt 1);11-20 PubMed 12562919
- 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
Developmental Biology (6th ed) Gilbert, Scott F. Sunderland (MA): Sinauer Associates, Inc.; c2000.
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
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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. 2017 Embryology Endocrine - Pancreas Development. Retrieved February 26, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Endocrine_-_Pancreas_Development
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