Bioluminescence imaging of glucose in tissue surrounding polyurethane and glucose sensor implants.

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2010-09-01

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Abstract

BACKGROUND: The bioluminescence technique was used to quantify the local glucose concentration in the tissue surrounding subcutaneously implanted polyurethane material and surrounding glucose sensors. In addition, some implants were coated with a single layer of adipose-derived stromal cells (ASCs) because these cells improve the wound-healing response around biomaterials. METHODS: Control and ASC-coated implants were implanted subcutaneously in rats for 1 or 8 weeks (polyurethane) or for 1 week only (glucose sensors). Tissue biopsies adjacent to the implant were immediately frozen at the time of explant. Cryosections were assayed for glucose concentration profile using the bioluminescence technique. RESULTS: For the polyurethane samples, no significant differences in glucose concentration within 100 μm of the implant surface were found between bare and ASC-coated implants at 1 or 8 weeks. A glucose concentration gradient was demonstrated around the glucose sensors. For all sensors, the minimum glucose concentration of approximately 4 mM was found at the implant surface and increased with distance from the sensor surface until the glucose concentration peaked at approximately 7 mM at 100 μm. Then the glucose concentration decreased to 5.5-6.5 mM more than 100 μmm from the surface. CONCLUSIONS: The ASC attachment to polyurethane and to glucose sensors did not change the glucose profiles in the tissue surrounding the implants. Although most glucose sensors incorporate a diffusion barrier to reduce the gradient of glucose and oxygen in the tissue, it is typically assumed that there is no steep glucose gradient around the sensors. However, a glucose gradient was observed around the sensors. A more complete understanding of glucose transport and concentration gradients around sensors is critical.

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10.1177/193229681000400504

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Prichard, Heather L, Thies Schroeder, William M Reichert and Bruce Klitzman (2010). Bioluminescence imaging of glucose in tissue surrounding polyurethane and glucose sensor implants. J Diabetes Sci Technol, 4(5). pp. 1055–1062. 10.1177/193229681000400504 Retrieved from https://hdl.handle.net/10161/10337.

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Scholars@Duke

Reichert

William M. Reichert

Professor Emeritus of Biomedical Engineering

Adjunct Professor of Biomedical Sciences, Makerere University, Kampala, Uganda (pending)
Director of the Duke-Makerere BME Partnership

Dr. Reichert's research interests have included biosensors, protein mediated cell adhesion, wound healing, and biocompatibilty.  Dr. Reichert was the first member of the engineering faculty to receive the Clemson Award from the Society for Biomaterials (there have since been three others) and elected as a Fellow of the International Union of Societies for Biomaterials Science and Engineering and the American Council on Education.  He was also elected as a Fellow of the American Institute of Medical and Biological Engineering and the Biomedical Engineering Society.  Dr. Reichert also received recognition for his student mentoring, especially in the area of diversity.  The drivers of his career were more than 30 years of uninterrupted NIH support from six different institutes, sustained support from the Medtronic Corporation, and the dedication and brilliance of numerous undergraduate, graduate, postdoc, staff and faculty colleagues.  But life moves on.

Dr. Reichert spent the 2014-15 academic year as a Fulbright Scholar (also a school of engineering first) in the fledgling BME program at Makerere University in Kampala, Uganda where he taught six classes in two semesters and conducted a major curriculum revision to increase engineering content.  This exhilarating (and exhausting) experience transformed Dr. Reichert’s professional priorities from domestic biomedical research to building BME capacity at Makerere University and in Uganda.  With generous funding from the Duke BME Department, Duke University Provost’s Office, the Duke Global Health Institute, the Pratt School of Engineering, and the Duke Africa Initiative, Dr. Reichert launched the Duke-Makerere BME Partnership to accelerate the development of biomedical engineering in Uganda.  The Partnership consists of three components.

Undergraduate Education. Currently there are two initiatives.  In the fall semester BME525 Biomedical Materials and Artificial Organs is taught to both Duke and Makerere students by broadcasting lectures recorded at Duke to students in Uganda.  The students take the same exams, are assigned the same readings, and conduct similar group projects.  Real time interaction between the instructor and the Makerere students is accomplished by weekly Skype sessions.  The Duke students are encouraged to incorporate some aspect of the Uganda circumstance in their projects.  In the spring term Duke offers a class BME590 Transcontinental Design for Uganda where a limited number of Duke and Makerere students participate in mutual design activities to create solutions to healthcare issues in Uganda.  This class also includes an option for the Duke students to travel to Uganda during their spring break to meet with and interact with their Makerere design partners.  Travel scholarships are provided by the Partnership predicated on financial need.

Master’s Education.  Receiving a Master’s degree is a significant step in the professional development of aspiring academics and entrepreneurs In Uganda.  Starting in August 2016 the Partnership will be bring two Ugandans with undergraduate BME degrees or a related field to Durham to join Duke BME Master’s Program.  A key component of student selection is performance in BME525 and BME590.  These students will spend the first two semesters taking BME classes at Duke and also defining their dissertation topics.  During the following summer the students will transition back to Makerere for their third and final semester where they complete their dissertation work and possibly take a class.  Dr. Reichert will travel to Uganda to join the Makerere faculty members for the dissertation defense, while the other Duke committee members will attend via Skype.  All educational and living expenses will be paid by the Partnership except for living expenses while the students are back in Uganda.

Doctoral Training.  Unlike the Bachelor’s or Master’s degree, the PhD degree is an immersive research experience.  Admission decisions to top science and engineering PhD programs are largely predicated upon evidence of a keen aptitude and substantial commitment to research. Making this determination with non-traditional candidates can be difficult, especially when in-person interviews are not possible. The Duke-Makerere BME Partnership provides an excellent opportunity for the Duke faculty to see the Uganda Master’s students up close and personal. The students that perform at a high level in their Duke classes and on their dissertation projects, and who are committed to pursuing the PhD, will be invited to apply to the Duke BME PhD program as a regular international student.

Klitzman

Bruce Klitzman

Associate Professor Emeritus in Surgery

Our overriding interests are in the fields of tissue engineering, wound healing, biosensors, and long term improvement of medical device implantation. My basic research interests are in the area of physiological mechanisms of optimizing substrate transport to tissue. This broad topic covers studies on a whole animal, whole organ, hemorheological, microvascular, cellular, ultrastructural, and molecular level. The current projects include:
1) control of blood flow and flow distribution in the microcirculation,
2) the effects of long-term synthetic and biologic implants on substrate transport to tissues,
3) tissue engineering; combining isolated cells, especially adult stem cells, with biomaterials to form specialized composite structures for implantation, with particular emphasis on endothelial cell physiology and its alteration by isolation and seeding on biomaterials.
4) decreasing the thrombogenicity of synthetic blood vessels and other blood-contacting devices, and improving their overall performance and biocompatibility.
5) reducing tissue damage resulting from abnormal perfusion (e.g., relative ischemia, anoxia, etc.) and therapies which minimize ischemic damage.
6) biosensor function, particularly glucose sensors in normal and diabetics.
7) measurement of tissue blood flow and oxygenation as an indicator of tissue viability and functional potential.
8) development of biocompatible materials for soft tissue reconstruction or augmentation.
9) improving performance of glaucoma drainage devices by directing a more favorable foreign body reaction
10) wound healing; particularly internal healing around foreign materials and the effect and prevention of microbes around implanted devices.


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