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Academics

College of Life Science and Bioengineering

With the specialization of biology, brain science, medical science, and IT/NT, KAIST has accumulated academic capability in the area of biology. The College of Life Science and Bioengineering was founded to efficiently support the fusion research environment of KI for Biocentury at KAIST.

The College of Life Science and Bioengineering is composed of the Department of Biological Sciences, Department of Bio & Brain Engineering, and Graduate School of Medical Science & Engineering. The college pursues multidisciplinary education & research in the area of biology and the development of modern science through the fusion of the IT & NT foundation techniques for the development of the nation’s biological science and technology.

The Department of Biological Sciences fosters scientists and engineers of life science and biotechnology equipped with creative research skills to lead in the development of science and technology in the area of biological sciences and excellent scientists equipped with future oriented thinking and a holistic personality.

The multidisciplinary Department of Bio & Brain Engineering fosters a creative workforce that is capable of creating new knowledge and techniques in the fusion areas of electronics, computers, and nanotechnology based on biomedical science.

The Graduate School of Medical Science & Engineering is catered to doctors (specialists), graduates from medical schools, dental schools, and schools of oriental medicine for the development of new medicine and medical devices. The Graduate School of Medical Science & Engineering was established with the purpose of developing life sciences and medical technology and fostering a high-quality workforce equipped with a multidisciplinary knowledge in basic medicine, life science, and biomedical engineering, as well as research experience.

Academic Degree Curriculum
Academic Degree Curriculum
Department/Major Bachelor's Courses Master's Courses Doctoral Courses Office of Academic Affairs Website
Department of Biological Sciences
042-350-2602(F.2610) Homepage go
Graduate School of Medical Science and Engineering
  042-350-4232(F.4240) Homepage go
Interdisciplinary Majors and Educational Programs
Education Program
College
(Department/Major)
Interdisciplinary Majors and Educational Programs Bachelor's Courses Master's Courses Doctoral Courses Office of Academic Affairs Website
Graduate School of Medical Science and Engineering
Biomedical Science and Engineering
Interdisciplinary Program
  042-350-4232(F.4240) Homepage go
※ Department of Bio and Brain Engineering is changed of affiliation from College of Life Science and Bioengineering to College of Engineering on March 1st, 2015.
KAIST COMPASS in Life Science & Bioengineering
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News
 
A Single, Master Switch for Sugar Levels?


PWhen a fly eats sugar, a single brain cell sends simultaneous messages to stimulate one hormone and inhibit another to control glucose levels in the body. Further research into this control system with remarkable precision could shed light on the neural mechanisms of diabetes and obesity in humans .

A single neuron appears to monitor and control sugar levels in the fly body, according to research published this week in Nature. This new insight into the mechanisms in the fly brain that maintain a balance of two key hormones controlling glucose levels, insulin and glucagon, can provide a framework for understanding diabetes and obesity in humans.

Neurons that sense and respond to glucose were identified more than 50 years ago, but what they do in our body has remained unclear. Researchers at the Korea Advanced Institute of Science and Technology (KAIST) and New York University School of Medicine have now found a single “glucose-sensing neuron” that appears to be the master controller in Drosophila, the vinegar fly, for maintaining an ideal glucose balance, called homeostasis.

Professor Greg Seong-Bae Suh, Dr. Yangkyun Oh and colleagues identified a key neuron that is excited by glucose, which they called CN neuron. This CN neuron has a unique shape – it has an axon (which is used to transmit information to downstream cells) that is bifurcated. One branch projects to insulin-producing cells, and sends a signal triggering the secretion of the insulin equivalent in flies. The other branch projects to glucagon-producing cells and sends a signal inhibiting the secretion of the glucagon equivalent.

When flies consume food, the levels of glucose in their body increase; this excites the CN neuron, which fires the simultaneous signals to stimulate insulin and inhibit glucagon secretion, thereby maintaining the appropriate balance between the hormones and sugar in the blood. The researchers were able to see this happening in the brain in real time by using a combination of cutting-edge fluorescent calcium imaging technology, as well as measuring hormone and sugar levels and applying highly sophisticated molecular genetic techniques.

When flies were not fed, however, the researchers observed a reduction in the activity of CN neuron, a reduction in insulin secretion and an increase in glucagon secretion. These findings indicate that these key hormones are under the direct control of the glucose-sensing neuron. Furthermore, when they silenced the CN neuron rendering dysfunctional CN neuron in flies, these animals experienced an imbalance, resulting in hyperglycemia – high levels of sugars in the blood, similar to what is observed in diabetes in humans. This further suggests that the CN neuron is critical to maintaining glucose homeostasis in animals.

While further research is required to investigate this process in humans, Suh notes this is a significant step forward in the fields of both neurobiology and endocrinology.

“This work lays the foundation for translational research to better understand how this delicate regulatory process is affected by diabetes, obesity, excessive nutrition and diets high in sugar,” Suh said.

Profile: Greg Seong-Bae Suh
seongbaesuh@kaist.ac.kr
Professor Department of Biological Sciences
KAIST



 (Figure: A single glucose-excited CN neuron extends bifurcated axonal branches, one of which innervates insulin producing cells and stimulates their activity an the other axonal branch projects to glucagon producing cells and inhibits their activity.)


< (Figure: A single glucose-excited CN neuron extends bifurcated axonal branches, one of which innervates insulin producing cells and stimulates their activity an the other axonal branch projects to glucagon producing cells and inhibits their activity.) >



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Newsletter
Department of Biological Sciences KAIST COMPASS
Contact Information for the College of Life Science and Bioengineering: 042-350-ext.

Office of the Dean of the College of Life Science and Bioengineering: 2125
College of Life Science and Bioengineering Academic and Student Affairs Team: 1401, 1409, Fax: 1400

KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea

T. 042-350-2114 / F. 042-350-2210 (2220)

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