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Artificial endocrine pancreas

Huajun Yu, Yunzhi Chen, Hongru Kong, Qikuan He, Hongwei Sun, Pravin Avinash Bhugul, Qiyu Zhang, Bicheng Chen, Mengtao Zhou
Background: Regenerative medicine and tissue engineering are promising approaches for organ transplantation. Extracellular matrix (ECM) based scaffolds obtained through the decellularization of natural organs have become the preferred platform for organ bioengineering. In the field of pancreas bioengineering, acellular scaffolds from different animals approximate the biochemical, spatial and vascular relationships of the native extracellular matrix and have been proven to be a good platform for recellularization and in vitro culture...
2018: Journal of Biological Engineering
Clifford J Bailey
This overview considers the opportunities and challenges that face the use of gluco-regulatory peptides to treat type 2 diabetes. New insulin analogues and formulations are being developed with pharmacokinetic properties to speed-up or prolong transfer from a subcutaneous injection site to the target tissues, or to selectively favour effects on the liver. Alternative routes of insulin administration continue to attract attention, and advances in the integration of glucose monitoring with insulin pump devices are improving miniaturised 'closed loop' artificial pancreas systems...
February 2018: Peptides
Koji Kawahito, Hirotaka Sato, Mamoru Kadosaki, Atsushi Egawa, Yoshio Misawa
OBJECTIVES: Although strict blood glucose control during cardiovascular surgery is essential to avoid postoperative complications, the various changes in glucose levels that occur during surgery have not been investigated in detail. In this study, we continuously monitored blood glucose changes during aortic surgery using the STG-55Ⓡ artificial endocrine pancreas (Nikkiso Inc., Tokyo). METHODS: Between December 2015 and 2016, we performed continuous blood glucose monitoring in 22 patients (14 men and 8 women, 72 ± 11 years old), who required hypothermic circulatory arrest during an ascending/aortic arch surgery, at the Jichi Medical University Hospital...
March 2018: General Thoracic and Cardiovascular Surgery
Alfonso Galderisi, Elise Schlissel, Eda Cengiz
PURPOSE OF REVIEW: Decades after the invention of insulin pump, diabetes management has encountered a technology revolution with the introduction of continuous glucose monitoring, sensor-augmented insulin pump therapy and closed-loop/artificial pancreas systems. In this review, we discuss the significance of the 2016 Endocrine Society Guidelines for insulin pump therapy and continuous glucose monitoring and summarize findings from relevant diabetes technology studies that were conducted after the publication of the 2016 Endocrine Society Guidelines...
September 23, 2017: Current Diabetes Reports
Pau Herrero, Jorge Bondia, Nick Oliver, Pantelis Georgiou
Type 1 diabetes is an autoimmune condition characterised by a pancreatic insulin secretion deficit, resulting in high blood glucose concentrations, which can lead to micro- and macrovascular complications. Type 1 diabetes also leads to impaired glucagon production by the pancreatic α-cells, which acts as a counter-regulatory hormone to insulin. A closed-loop system for automatic insulin and glucagon delivery, also referred to as an artificial pancreas, has the potential to reduce the self-management burden of type 1 diabetes and reduce the risk of hypo- and hyperglycemia...
October 2017: Computer Methods in Biomechanics and Biomedical Engineering
Clara V Alvarez, Fernando Oroz-Gonjar, Montserrat Garcia-Lavandeira
No abstract text is available yet for this article.
April 15, 2017: Molecular and Cellular Endocrinology
Naoji Mita, Shinji Kawahito, Tomohiro Soga, Kazumi Takaishi, Hiroshi Kitahata, Munehide Matsuhisa, Mitsuo Shimada, Hiroyuki Kinoshita, Yasuo M Tsutsumi, Katsuya Tanaka
The aim of the present study was to evaluate the usefulness of a closed-loop system (STG-55; Nikkiso, Tokyo, Japan), a type of artificial endocrine pancreas for the continuous monitoring and control of intraoperative blood glucose, for preventing postoperative acute kidney injury (AKI) in patients undergoing hepatectomy. Thirty-eight patients were enrolled in this study. Glucose concentrations were controlled with either a manual injection of insulin based on a commonly used sliding scale (manual insulin group, n = 19) or the programmed infusion of insulin determined by the control algorithm of the artificial endocrine pancreas (programmed insulin group, n = 19)...
March 2017: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
Peter G Jacobs, Navid Resalat, Joseph El Youssef, Ravi Reddy, Deborah Branigan, Nicholas Preiser, John Condon, Jessica Castle
In this article, we present several important contributions necessary for enabling an artificial endocrine pancreas (AP) system to better respond to exercise events. First, we show how exercise can be automatically detected using body-worn accelerometer and heart rate sensors. During a 22 hour overnight inpatient study, 13 subjects with type 1 diabetes wearing a Zephyr accelerometer and heart rate monitor underwent 45 minutes of mild aerobic treadmill exercise while controlling their glucose levels using sensor-augmented pump therapy...
October 5, 2015: Journal of Diabetes Science and Technology
Nadiah Ghazalli, Alborz Mahdavi, Tao Feng, Liang Jin, Mark T Kozlowski, Jasper Hsu, Arthur D Riggs, David A Tirrell, H Teresa Ku
Postnatal pancreas is a potential source for progenitor cells to generate endocrine β-cells for treating type 1 diabetes. However, it remains unclear whether young (1-week-old) pancreas harbors multipotent progenitors capable of differentiating into duct, acinar, and endocrine cells. Laminin is an extracellular matrix (ECM) protein important for β-cells' survival and function. We established an artificial extracellular matrix (aECM) protein that contains the functional IKVAV (Ile-Lys-Val-Ala-Val) sequence derived from laminin (designated aECM-lam)...
September 1, 2015: Stem Cells and Development
Noriko Kambe, Shinji Kawahito, Naoji Mita, Kazumi Takaishi, Toshiko Katayama, Yoko Sakai, Tomohiro Soga, Hiroaki Kawano, Munehide Matsuhisa, Mitsuo Shimada, Tetsuya Kitagawa, Hiroshi Kitahata
BACKGROUND: Recent studies have shown that strict perioperative blood glucose management may reduce mortality and morbidity in critically ill adult patients. The purpose of this study was to assess the accuracy and efficacy of the intraoperative application of a newly developed, next-generation artificial endocrine pancreas (STG-55, Nikkiso Co., Ltd., Tokyo, Japan). METHODS: Twenty patients scheduled to undergo surgery were enrolled in this study. The STG-55 is designed to be more user-friendly than its conventional counterpart (STG-22) while maintaining the latter's fundamental functions, such as a closed-loop system using algorithms for insulin and glucose infusion...
2015: Journal of Medical Investigation: JMI
Matilde Otero-Losada, Gabriel Cao, Julián González, Angélica Muller, Graciela Ottaviano, Christopher Lillig, Francisco Capani, Giuseppe Ambrosio, José Milei
AIM: We report the effects of long-term cola beverage drinking on glucose homeostasis, endocrine pancreas function and morphology in rats. METHODS: Wistar rats drank: water (group W), regular cola beverage (group C, sucrose sweetened) or "light" cola beverage (group L, artificially sweetened). After 6 months, 50% of the animals in each group were euthanized and the remaining animals consumed water for the next 6 months when euthanasia was performed. Biochemical assays, insulinemia determination, estimation of insulin resistance (HOMA-IR), morphometry and immunohistochemistry evaluations were performed in pancreas...
2015: PloS One
Chao Fang, Bo Ning, Ahmed Bilal Waqar, Manabu Niimi, Shen Li, Kaneo Satoh, Masashi Shiomi, Ting Ye, Sijun Dong, Jianglin Fan
Bisphenol A (BPA) is an artificial environmental endocrine disrupter. Excess exposure to BPA may induce many disorders in the metabolism and cardiovascular system. However, the underlying toxicological mechanisms remain largely unknown. In this study, we administered genetically hyperlipidemic Watanabe heritable hyperlipidemic (WHHL-MI) rabbits (male, 14 week old), which have more common features with humans than the mouse and rat especially in the metabolism and cardiovascular system, with BPA at 40 mg kg(-1)  day(-1) for 8 weeks by gavage and compared their plasma lipids, glucose and insulin response with those of the vehicle group...
September 2015: Journal of Applied Toxicology: JAT
Kayo Hirose, Shinji Kawahito, Naoji Mita, Kazumi Takaishi, Tomiya Kawahara, Tomohiro Soga, Toshiko Katayama, Satoru Imura, Yuji Morine, Tetsuya Ikemoto, Mitsuo Shimada, Munehide Matsuhisa, Hiroshi Kitahata
A 71-year-old woman had an episode of syncope due to hypoglycemia of 27 mg/dl. She was diagnosed with insulinoma and scheduled for laparoscopic enucleation along with the use of an artificial endocrine pancreas (STG-22, Nikkiso Co., Ltd., Tokyo, Japan). Anesthesia was maintained with sevoflurane and remifentanil. Her blood glucose level was controlled using the artificial endocrine pancreas, which enabled continuous blood glucose monitoring and computer-operated glucose and insulin infusion to maintain the blood glucose level at a steady state...
2014: Journal of Medical Investigation: JMI
Ling Hinshaw, Michele Schiavon, Ashwini Mallad, Chiara Dalla Man, Rita Basu, Adil E Bharucha, Claudio Cobelli, Rickey E Carter, Ananda Basu, Yogish C Kudva
Controlling meal-related glucose excursions continues to be a therapeutic challenge in diabetes mellitus. Mechanistic reasons for this need to be understood better to develop appropriate therapies. To investigate delayed gastric emptying effects on postprandial glucose turnover, insulin sensitivity, and β-cell responsivity and function, as a feasibility study prior to studying patients with type 1 diabetes, we used the triple tracer technique C-peptide and oral minimal model approach in healthy subjects. A single dose of 30 μg of pramlintide administered at the start of a mixed meal was used to delay gastric emptying rates...
September 15, 2014: American Journal of Physiology. Endocrinology and Metabolism
Nicholas Caputo, Melanie A Jackson, Jessica R Castle, Joseph El Youssef, Parkash A Bakhtiani, Colin P Bergstrom, Julie M Carroll, Matthew E Breen, Gerald L Leonard, Larry L David, Charles T Roberts, W Kenneth Ward
BACKGROUND: For patients with type 1 diabetes mellitus, a bihormonal artificial endocrine pancreas system utilizing glucagon and insulin has been found to stabilize glycemic control. However, commercially available formulations of glucagon cannot currently be used in such systems because of physical instability characterized by aggregation and chemical degradation. Storing glucagon at pH 10 blocks protein aggregation but results in chemical degradation. Reductions in pH minimize chemical degradation, but even small reductions increase protein aggregation...
November 2014: Diabetes Technology & Therapeutics
Kazuhiro Hanazaki, Hiroyuki Kitagawa, Tomoaki Yatabe, Masaya Munekage, Ken Dabanaka, Yuka Takezaki, Yuuki Tsukamoto, Takuji Asano, Yoshihiko Kinoshita, Tsutomu Namikawa
BACKGROUND: We examined whether perioperative intensive insulin therapy (IIT) using an artificial pancreas (AP) with a closed-loop glycemic control system can be used to prevent hypoglycemia in surgical patients. METHODS: Between 2006 and 2012, perioperative glycemic control using an AP was performed in 427 patients undergoing general surgery. A total of 305 patients undergoing IIT using an AP in the target blood glucose range of 80 to 110 mg/dL were enrolled in the study...
June 2014: American Journal of Surgery
Tsuyoshi Okada, Shinji Kawahito, Naoji Mita, Munehide Matsuhisa, Hiroshi Kitahata, Mitsuo Shimada, Shuzo Oshita
BACKGROUND: The purpose of this study was to evaluate the usefulness of the closed-loop system (STG-22; Nikkiso, Tokyo, Japan), a type of artificial endocrine pancreas for the continuous monitoring and control of intraoperative blood glucose in patients undergoing liver transplantation. METHODS: Sixteen patients undergoing living-donor liver transplantation were enrolled in this study. Glucose levels were controlled with either a manual injection of insulin based on a commonly used sliding scale (manual insulin group, n=8) or a programmed infusion of insulin determined by the control algorithm of the artificial endocrine pancreas (programmed insulin group, n=8)...
2013: Journal of Medical Investigation: JMI
Y H Jo, B M Nam, B Y Kim, J G Nemeno, S Lee, J E Yeo, W Yang, S H Park, Y S Kim, J I Lee
Investigators conducting diabetes-related research have focused on islet transplantation as a radical therapy for type 1 diabetes mellitus. Pancreatic islet isolation, an essential process, is a very demanding work because of the proteolytic enzymes, species, treatment time, and individual difference. Replacement of primary isolated pancreatic islets must be carried out continuously for various in vitro tests, making primary isolated islets a useful tool for cell transplantation research. Hence, we sought to develop pseudoislets from commercial pancreas-derived cell lines...
October 2013: Transplantation Proceedings
Kazuhiro Hanazaki, Tsutomu Namikawa
It is well known that tight glycemic control (TGC) in patients with diabetes mellitus is the most important to reduce complications, such as nephropathy, neuropathy, and retinopathy. Also, surgical stress induced hyperglycemia leading to glucose toxicity is the main cause of infectious complications after surgery. Recently perioperative TGC has been proven an effective method to reduce postoperative infectious complications and accelerate enhanced recovery after surgery (ERAS), with the main purpose of short staying hospital...
2013: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Shinji Kawahito, Seiichi Higuchi, Naoji Mita, Tetsuya Kitagawa, Hiroshi Kitahata
We tried to perform continuous blood glucose monitoring during cardiovascular surgery involving cardiopulmonary bypass using an artificial endocrine pancreas (STG-22 or -55; Nikkiso, Tokyo, Japan); however, we often encountered problems during these procedures because insufficient blood was obtained for monitoring. Thus, we started performing the blood sampling via the venous side of the cardiopulmonary bypass circuit. As a result, continuous blood glucose monitoring using an artificial endocrine pancreas was proven to be stable and reliable during cardiovascular surgery involving cardiopulmonary bypass...
December 2013: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
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