Insulin degradation by acinar cell proteases creates a dysfunctional environment for human islets before/after transplantation

Benefits of α-1 antitrypsin treatment

Gopalakrishnan Loganathan, Rajinder Dawra, Subbiah Pugazhenthi, Zhiguang Guo, Sajjad M. Soltani, Alexander Wiseman, Mark A. Sanders, Klearchos K. Papas, Kumaravel Velayutham, Ashok Saluja, David E.R. Sutherland, Bernhard J. Hering, A. N. Balamurugan

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

BACKGROUND.: Pancreatic acinar cells are commonly cotransplanted along with islets during auto- and allotransplantations. The aims of this study were to identify how acinar cell proteases cause human islet cell loss before and after transplantation of impure islet preparations and to prevent islet loss and improve function with supplementation of α-1 antitrypsin (A1AT). METHODS.: Acinar cell protease activity, insulin levels, and percent islet loss were measured after culture of pure and impure clinical islet preparations. The effect of proteases on ultrastructure of islets and β-cell insulin granules were examined by transmission electron microscopy. The number of insulin granules and insulin-labeled immunogold particles were counted. The in vivo effect of proteases on islet function was studied by transplanting acinar cells adjacent to islet grafts in diabetic mice. The effects of A1AT culture supplementation on protease activity, insulin levels, and islet function were assessed in pure and impure islets. RESULTS.: Islet loss after culture was significantly higher in impure relative to pure preparations (30% vs. 14%, P<0.04). Lower islet purity was associated with increased protease activity and decreased insulin levels in culture supernatants. Reduced β-cell insulin granules and insulin degradation by proteases were confirmed by transmission electron microscopy. Transplantations in mice showed delayed islet graft function when acinar cells were transplanted adjacent to the islets under the kidney capsule. Supplementation of A1AT to impure islet cultures maintained islet cell mass, restored insulin levels, and preserved islet functional integrity. CONCLUSION.: Culture of impure human islet fractions in the presence of A1AT prevents insulin degradation and improves islet recovery.

Original languageEnglish (US)
Pages (from-to)1222-1230
Number of pages9
JournalTransplantation
Volume92
Issue number11
DOIs
StatePublished - Dec 15 2011
Externally publishedYes

Fingerprint

Acinar Cells
Peptide Hydrolases
Transplantation
Insulin
Insulysin
Islets of Langerhans
Transmission Electron Microscopy
Therapeutics
Delayed Graft Function
Islets of Langerhans Transplantation
Autologous Transplantation
Capsules
Transplants
Kidney

Keywords

  • α-1 antitrypsin
  • Acinar cell protease
  • Impure islet culture
  • Insulin degradation
  • Islet cell transplantation
  • Protease inhibitor

ASJC Scopus subject areas

  • Transplantation

Cite this

Insulin degradation by acinar cell proteases creates a dysfunctional environment for human islets before/after transplantation : Benefits of α-1 antitrypsin treatment. / Loganathan, Gopalakrishnan; Dawra, Rajinder; Pugazhenthi, Subbiah; Guo, Zhiguang; Soltani, Sajjad M.; Wiseman, Alexander; Sanders, Mark A.; Papas, Klearchos K.; Velayutham, Kumaravel; Saluja, Ashok; Sutherland, David E.R.; Hering, Bernhard J.; Balamurugan, A. N.

In: Transplantation, Vol. 92, No. 11, 15.12.2011, p. 1222-1230.

Research output: Contribution to journalArticle

Loganathan, G, Dawra, R, Pugazhenthi, S, Guo, Z, Soltani, SM, Wiseman, A, Sanders, MA, Papas, KK, Velayutham, K, Saluja, A, Sutherland, DER, Hering, BJ & Balamurugan, AN 2011, 'Insulin degradation by acinar cell proteases creates a dysfunctional environment for human islets before/after transplantation: Benefits of α-1 antitrypsin treatment', Transplantation, vol. 92, no. 11, pp. 1222-1230. https://doi.org/10.1097/TP.0b013e318237585c
Loganathan, Gopalakrishnan ; Dawra, Rajinder ; Pugazhenthi, Subbiah ; Guo, Zhiguang ; Soltani, Sajjad M. ; Wiseman, Alexander ; Sanders, Mark A. ; Papas, Klearchos K. ; Velayutham, Kumaravel ; Saluja, Ashok ; Sutherland, David E.R. ; Hering, Bernhard J. ; Balamurugan, A. N. / Insulin degradation by acinar cell proteases creates a dysfunctional environment for human islets before/after transplantation : Benefits of α-1 antitrypsin treatment. In: Transplantation. 2011 ; Vol. 92, No. 11. pp. 1222-1230.
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AU - Pugazhenthi, Subbiah

AU - Guo, Zhiguang

AU - Soltani, Sajjad M.

AU - Wiseman, Alexander

AU - Sanders, Mark A.

AU - Papas, Klearchos K.

AU - Velayutham, Kumaravel

AU - Saluja, Ashok

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N2 - BACKGROUND.: Pancreatic acinar cells are commonly cotransplanted along with islets during auto- and allotransplantations. The aims of this study were to identify how acinar cell proteases cause human islet cell loss before and after transplantation of impure islet preparations and to prevent islet loss and improve function with supplementation of α-1 antitrypsin (A1AT). METHODS.: Acinar cell protease activity, insulin levels, and percent islet loss were measured after culture of pure and impure clinical islet preparations. The effect of proteases on ultrastructure of islets and β-cell insulin granules were examined by transmission electron microscopy. The number of insulin granules and insulin-labeled immunogold particles were counted. The in vivo effect of proteases on islet function was studied by transplanting acinar cells adjacent to islet grafts in diabetic mice. The effects of A1AT culture supplementation on protease activity, insulin levels, and islet function were assessed in pure and impure islets. RESULTS.: Islet loss after culture was significantly higher in impure relative to pure preparations (30% vs. 14%, P<0.04). Lower islet purity was associated with increased protease activity and decreased insulin levels in culture supernatants. Reduced β-cell insulin granules and insulin degradation by proteases were confirmed by transmission electron microscopy. Transplantations in mice showed delayed islet graft function when acinar cells were transplanted adjacent to the islets under the kidney capsule. Supplementation of A1AT to impure islet cultures maintained islet cell mass, restored insulin levels, and preserved islet functional integrity. CONCLUSION.: Culture of impure human islet fractions in the presence of A1AT prevents insulin degradation and improves islet recovery.

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