from 1552 bc to 2015 - harvard university
TRANSCRIPT
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From 1552 BC to 2015: How Science Made Diabetes Treatable
Mary Gearing Biological and Biomedical Sciences Program,
Harvard University
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Outline
1. A (Very!) Short History of Diabetes
2. Diabetes Research and Treatment Today
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Diabetes: one of the oldest diseases known to man.
First documented in 1552 BC Egyptian physician: Hesy-Ra Symptoms: Rapid weight loss Frequent urination Urine attracted ants
Hesy-Ra (public domain)
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1st century CE: Arateus
“A melting down of flesh into urine” Coined the term “diabetes mellitus”
Diabetes: siphon, passing through Mellitus: sweet (sugar)
Diabetes is a death sentence through the early 20th century! Scientific lesson: Must understand the disease biology, not just the symptoms!
Effects of insulin therapy from Geyelin 1922 (public domain)
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1889: Finding a cause for diabetes
Minkowski/von Mering Removed pancreas from dogs Rapid onset of diabetes Scientific lesson: Key discoveries are
often unexpected!
CC BY 3.0 Blausen.com staff. "Blausen gallery 2014". Wikiversity Journal of Medicine. ISSN 20018762 - Own work
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1869: Looking closely at the pancreas
Paul Langerhans – two types of pancreatic structures
CC BY 3.0 “Illustration from Anatomy & Physiology, Connexions Website” by Openstax College. http://cnx.org/content/col11496/1.6/ Jun 19, 2013.
(Digestion)
Islets (??)
Are the islets important in diabetes? Can we isolate insulin
and use it to treat patients? Diabetes = loss of an
islet protein (insulin)
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Treated diabetic dogs with pancreatic extract Some success…but lots of technical problems
C. H. Best and F. G. Banting ca. 1924 (public domain)
1921: Banting/Best and Macleod
Scientific lesson: If at first you don’t succeed,
try and try again.
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Banting/Best and Macleod/Collip
1922: Treated diabetic children
Nobel Peace Prize (public domain); Effects of insulin therapy from Geyelin 1922 (public domain)
Scientific lesson: When you find something big, run with it!
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What does insulin do?
Energy uptake and storage
Insulin (hormone)
“food signal” Breakdown of stored energy (fat, proteins)
Good Food Display - NCI Visuals Online (public domain)
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Insulin and glucose (sugar)
Effect of insulin on glucose uptake and metabolism (public domain)
bloodstream
inside of the cell
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Type 1 vs Type 2 diabetes Type I diabetes
(10%, <30 at diagnosis)
Type 2 diabetes (90%, assoc. with
obesity)
Effect of insulin on glucose uptake and metabolism (public domain), Day 94: Earplugs by Quinn Dombrowski (CC BY-SA 2.0)
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Recap Insulin is a hormone that controls glucose metabolism. Type 1 diabetes: insulin is absent Type 2 diabetes: the body doesn’t respond properly to insulin
Questions??
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Outline
1. A (Very!) Short History of Diabetes
2. Diabetes Research and Treatment Today
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Current diabetes treatments
Insulin pumps
Synthetic insulin produced by engineered bacteria or yeast
Glucose-lowering drugs
Animas Vibe - insulin pump and CGM system by Alden Chadwick (CC BY 2.0); Generic metformin (public domain) ; Insulin vial (public domain)
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What problems remain
Animas Vibe - insulin pump and CGM system by Alden Chadwick (CC BY 2.0); Blausen.com staff. "Blausen gallery 2014". Wikiversity Journal of Medicine. ISSN 20018762 - Own work (CC BY 3.0)
Today: diabetic life expectancy is 10-13 years lower than for non-diabetics. A cure has remained elusive.
does not equal
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Insulin is very complicated! GLUT-4
Insulin receptor
Insulin Glucose
“Insulin action on the cell process (Figure 1.1.2)” by The firesofedition (CC BY-SA 3.0)
bloodstream
inside of the cell
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Complications: blood vessels
Microvascular (small vessels)
Macrovascular (large vessels)
Kidney disease Nerve death Eye disease
Atherosclerosis Heart attack
Stroke
Pain/suffering Death (>65%)
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New research in type I diabetes Stem cells!
“Drawing of a grey mouse” by Jan Gilbank (CC BY 3.0); Stem cell figure adapted from Pagliuca et al., 2014
Stem cells Insulin-producing cells
Transplantation into diabetic mouse “Artificial
pancreas”
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Conclusions Diabetes: a research success story One door opens another… Research today aimed at:
Decreasing diabetic complications Stem cell therapies (type I) Preventing type 2 diabetes and pre- diabetes (~30% of population)
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What can you do? Lead a healthy lifestyle (diet and exercise) Support biomedical research
Foods from plant sources (public domain); World Diabetes Day (public domain)
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Thank you! SITN would like to acknowledge the following
organizations for their generous support of this event.