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Qin T, Hu S, Smink AM, de Haan BJ, Silva-Lagos LA, Lakey JR, de Vos P. Inclusion of extracellular matrix molecules and necrostatin-1 in the intracapsular environment of alginate-based microcapsules synergistically protects pancreatic β cells against cytokine-induced inflammatory stress. Acta Biomater 2022; 146:434-449. [PMID: 35500812 DOI: 10.1016/j.actbio.2022.04.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/22/2022] [Accepted: 04/26/2022] [Indexed: 11/01/2022]
Abstract
Immunoisolation of pancreatic islets in alginate-based microcapsules is a promising approach for grafting of islets in absence of immunosuppression. However, loss and damage to the extracellular matrix (ECM) during islet isolation enhance susceptibility of islets for inflammatory stress. In this study, a combined strategy was applied to reduce this stress by incorporating ECM components (collagen type IV/RGD) and necroptosis inhibitor, necrostatin-1 (Nec-1) in alginate-based microcapsules in vitro. To demonstrate efficacy, viability and function of MIN6 β-cells and human islets in capsules with collagen type IV/RGD and/or Nec-1 was investigated in presence and absence of IL-1β, IFN-γ and TNF-α. The combination of collagen type IV/RGD and Nec-1 had higher protective effects than the molecules alone. Presence of collagen type IV/RGD and Nec-1 in the intracapsular environment reduced cytokine-induced overproduction of free radical species and unfavorable shifts in mitochondrial dynamics. In addition, the ECM components collagen type IV/RGD prevented a cytokine induced suppression of the FAK/Akt pathway. Our data indicate that the inclusion of collagen type IV/RGD and Nec-1 in the intracapsular environment prevents islet-cell loss when exposed to inflammatory stress, which might contribute to higher survival of β-cells in the immediate period after transplantation. This approach of inclusion of stress reducing agents in the intracapsular environment of immunoisolating devices may be an effective way to enhance the longevity of encapsulated islet grafts. STATEMENT OF SIGNIFICANCE: Islet-cells in immunoisolated alginate-based microcapsules are very susceptible to inflammatory stress which impacts long-term survival of islet grafts. Here we show that incorporation of ECM components (collagen type IV/RGD) and necrostatin-1 (Nec-1) in the intracapsular environment of alginate-based capsules attenuates this susceptibility and promotes islet-cell survival. This effect induced by collagen type IV/RGD and Nec-1 was probably due to lowering free radical production, preventing mitochondrial dysfunction and by maintaining ECM/integrin/FAK/Akt signaling and Nec-1/RIP1/RIP3 signaling. Our study provides an effective strategy to extend longevity of islet grafts which might be of great potential for future clinical application of immunoisolated cells.
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Hawthorne WJ, Fuller E, Thomas A, Rao JS, Burlak C. Updateon xenotransplantation for May/June 2021. Xenotransplantation 2021; 28:e12710. [PMID: 34617623 DOI: 10.1111/xen.12710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 09/02/2021] [Indexed: 11/30/2022]
Affiliation(s)
- Wayne J Hawthorne
- Centre for Transplant & Renal Research, Westmead Institute for Medical Research, Westmead, New South Wales, Australia.,Department of Surgery, Westmead Clinical School, Westmead Hospital, University of Sydney, Westmead, New South Wales, Australia
| | - Erin Fuller
- Centre for Transplant & Renal Research, Westmead Institute for Medical Research, Westmead, New South Wales, Australia
| | - Adwin Thomas
- Centre for Transplant & Renal Research, Westmead Institute for Medical Research, Westmead, New South Wales, Australia
| | - Joseph Sushil Rao
- Schulze Diabetes Institute, Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA.,Solid Organ Transplantation, Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - Christopher Burlak
- Schulze Diabetes Institute, Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA
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Lau H, Li S, Corrales N, Rodriguez S, Mohammadi M, Alexander M, de Vos P, Lakey JRT. Necrostatin-1 Supplementation to Islet Tissue Culture Enhances the In-Vitro Development and Graft Function of Young Porcine Islets. Int J Mol Sci 2021; 22:8367. [PMID: 34445075 PMCID: PMC8394857 DOI: 10.3390/ijms22168367] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/27/2021] [Accepted: 07/29/2021] [Indexed: 11/20/2022] Open
Abstract
Pre-weaned porcine islets (PPIs) represent an unlimited source for islet transplantation but are functionally immature. We previously showed that necrostatin-1 (Nec-1) immediately after islet isolation enhanced the in vitro development of PPIs. Here, we examined the impact of Nec-1 on the in vivo function of PPIs after transplantation in diabetic mice. PPIs were isolated from pancreata of 8-15-day-old, pre-weaned pigs and cultured in media alone, or supplemented with Nec-1 (100 µM) on day 0 or on day 3 of culture (n = 5 for each group). On day 7, islet recovery, viability, oxygen consumption rate, insulin content, cellular composition, insulin secretion capacity, and transplant outcomes were evaluated. While islet viability and oxygen consumption rate remained high throughout 7-day tissue culture, Nec-1 supplementation on day 3 significantly improved islet recovery, insulin content, endocrine composition, GLUT2 expression, differentiation potential, proliferation capacity of endocrine cells, and insulin secretion. Adding Nec-1 on day 3 of tissue culture enhanced the islet recovery, proportion of delta cells, beta-cell differentiation and proliferation, and stimulation index. In vivo, this leads to shorter times to normoglycemia, better glycemic control, and higher circulating insulin. Our findings identify the novel time-dependent effects of Nec-1 supplementation on porcine islet quantity and quality prior to transplantation.
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Affiliation(s)
- Hien Lau
- Department of Surgery, University of California Irvine, Irvine, CA 92868, USA; (H.L.); (N.C.); (S.R.); (M.A.)
| | - Shiri Li
- Weill Cornell Medical College, Cornell University, Ithaca, NY 14850, USA;
| | - Nicole Corrales
- Department of Surgery, University of California Irvine, Irvine, CA 92868, USA; (H.L.); (N.C.); (S.R.); (M.A.)
| | - Samuel Rodriguez
- Department of Surgery, University of California Irvine, Irvine, CA 92868, USA; (H.L.); (N.C.); (S.R.); (M.A.)
| | - Mohammadreza Mohammadi
- Sue and Bill Gross Stem Cell Research Center, Department of Materials Science and Engineering, University of California Irvine, Irvine, CA 92697, USA;
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA 92697, USA
| | - Michael Alexander
- Department of Surgery, University of California Irvine, Irvine, CA 92868, USA; (H.L.); (N.C.); (S.R.); (M.A.)
| | - Paul de Vos
- University Medical Center Groningen, Department of Pathology and Medical Biology, University of Groningen, 9713 GZ Groningen, The Netherlands;
| | - Jonathan RT Lakey
- Department of Surgery, University of California Irvine, Irvine, CA 92868, USA; (H.L.); (N.C.); (S.R.); (M.A.)
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA 92697, USA
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Hu S, Martinez-Garcia FD, Moeun BN, Burgess JK, Harmsen MC, Hoesli C, de Vos P. An immune regulatory 3D-printed alginate-pectin construct for immunoisolation of insulin producing β-cells. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 123:112009. [PMID: 33812628 DOI: 10.1016/j.msec.2021.112009] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/04/2021] [Accepted: 02/27/2021] [Indexed: 12/12/2022]
Abstract
Different bioinks have been used to produce cell-laden alginate-based hydrogel constructs for cell replacement therapy but some of these approaches suffer from issues with print quality, long-term mechanical instability, and bioincompatibility. In this study, new alginate-based bioinks were developed to produce cell-laden grid-shaped hydrogel constructs with stable integrity and immunomodulating capacity. Integrity and printability were improved by including the co-block-polymer Pluronic F127 in alginate solutions. To reduce inflammatory responses, pectin with a low degree of methylation was included and tested for inhibition of Toll-Like Receptor 2/1 (TLR2/1) dimerization and activation and tissue responses under the skin of mice. The viscoelastic properties of alginate-Pluronic constructs were unaffected by pectin incorporation. The tested pectin protected printed insulin-producing MIN6 cells from inflammatory stress as evidenced by higher numbers of surviving cells within the pectin-containing construct following exposure to a cocktail of the pro-inflammatory cytokines namely, IL-1β, IFN-γ, and TNF-α. The results suggested that the cell-laden construct bioprinted with pectin-alginate-Pluronic bioink reduced tissue responses via inhibiting TLR2/1 and support insulin-producing β-cell survival under inflammatory stress. Our study provides a potential novel strategy to improve long-term survival of pancreatic islet grafts for Type 1 Diabetes (T1D) treatment.
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Affiliation(s)
- Shuxian Hu
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, EA 11, 9713 GZ Groningen, the Netherlands.
| | - Francisco Drusso Martinez-Garcia
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, EA 11, 9713 GZ Groningen, the Netherlands
| | - Brenden N Moeun
- Department of Chemical Engineering, McGill University, 3610 rue University, Montreal, QC, Canada
| | - Janette Kay Burgess
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, EA 11, 9713 GZ Groningen, the Netherlands
| | - Martin Conrad Harmsen
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, EA 11, 9713 GZ Groningen, the Netherlands
| | - Corinne Hoesli
- Department of Chemical Engineering, McGill University, 3610 rue University, Montreal, QC, Canada; Department of Biological and Biomedical Engineering, McGill University, 3775 rue University, Montreal, QC, Canada
| | - Paul de Vos
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, EA 11, 9713 GZ Groningen, the Netherlands
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