The islet of Langerhans, functioning as a "mini organ", plays a vital role in regulating endocrine activities due to its intricate structure. Dysfunction in these islets is closely associated with the development of diabetes mellitus (DM). To offer valuable insights for DM research and treatment, various approaches have been proposed to create artificial islets or islet organoids with high similarity to natural islets, under the collaborative effort of biologists, clinical physicians, and biomedical engineers. This review investigates the design and fabrication of artificial islets considering both biological and tissue engineering aspects. It begins by examining the natural structures and functions of native islets and proceeds to analyze the protocols for generating islets from stem cells. The review also outlines various techniques used in crafting artificial islets, with a specific focus on hydrogel-based ones. Additionally, it provides a concise overview of the materials and devices employed in the clinical applications of artificial islets. Throughout, the primary goal is to develop artificial islets, thereby bridging the realms of developmental biology, clinical medicine, and tissue engineering.
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http://dx.doi.org/10.1002/SMMD.20230042 | DOI Listing |
Sci Data
December 2024
Sarawak Forestry Corporation, Sarawak, 93250, Malaysia.
Photo- and video-based reidentification of green sea turtles using their natural markers is far less invasive than artificial tagging. An RGB camera mounted on a man-portable rig, was used to collect video data on Greater Talang Island (1 °54'45″N 109 °46'33″E) from September to October 2022, and September 2023. This islet is located 30 minutes offshore from the Sematan district in Southwest Sarawak, Malaysia.
View Article and Find Full Text PDFJ Pathol Inform
January 2025
Department of Pharmaceutics, Center for Pharmacometrics and Systems Pharmacology, Intelligent Critical Care Center, College of Pharmacy, University of Florida, Orlando, FL, USA.
Human islets display a high degree of heterogeneity in terms of size, number, architecture, and endocrine cell-type compositions. An ever-increasing number of immunohistochemistry-stained whole slide images (WSIs) are available through the online pathology database of the Network for Pancreatic Organ donors with Diabetes (nPOD) program at the University of Florida (UF). We aimed to develop an enhanced machine learning-assisted WSI analysis workflow to utilize the nPOD resource for analysis of endocrine cell heterogeneity in the natural history of type 1 diabetes (T1D) in comparison to donors without diabetes.
View Article and Find Full Text PDFLoss-of-function (LOF) mutations in KATP channels cause hyperexcitability and insulin hypersecretion, resulting in congenital hyperinsulinism (CHI). Paradoxically, despite the initial insulin hypersecretion, many CHI cases, as well as KATP knockout (KO) animals, eventually 'crossover' to undersecretion and even diabetes. Here we confirm that Sur1 KO islets exhibit higher intracellular [Ca2+] ([Ca2+]i) at all [glucose], but show decreased glucose-stimulated insulin secretion.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2024
Department of Bioengineering and Nano-Bioengineering, College of Life Sciences and Bioengineering, Incheon National University, Incheon 22012, Republic of Korea.
Treating type 1 diabetes (T1D) through β-cell macroencapsulation is a promising long-term solution, but it faces challenges such as immune-mediated fibrosis on the capsule surface, which impairs cell functionality and compromises longevity and effectiveness. This study presents an approach for including an anti-inflammatory molecule on the macroencapsulation device (MED) using initiated chemical vapor deposition for the surface modification of poly(tetrafluoroethylene) (PTFE) membranes. The surface-modified MEDs significantly reduced fibrosis, improved β-cell viability and functionality, and promoted M2 macrophage polarization, which is associated with anti-inflammatory effects.
View Article and Find Full Text PDFProducing a tissue-engineered pancreas based on a tissue-specific scaffold from a decellularized pancreas, imitating the natural pancreatic tissue microenvironment and the islets of Langerhans, is one of the approaches to treating patients with type 1 diabetes mellitus (T1DM). The aim of this work was to investigate the ability of a fine-dispersed tissue-specific scaffold (DP scaffold) from decellularized human pancreas fragments to support the islets' survival and insulin-producing function when injected in a streptozotocin-induced diabetic rat model. The developed decellularization protocol allows us to obtain a scaffold with a low DNA content (33 [26; 38] ng/mg of tissue, < 0.
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