Cited by 342Pancreatic function and diabetesDiabetes and associated disordersPluripotent Stem Cells Research

Implanted pluripotent stem-cell-derived pancreatic endoderm cells secrete glucose-responsive C-peptide in patients with type 1 diabetes

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Ramzy, Adam, Thompson, David M., Ward-Hartstonge, Kirsten A., Ivison, Sabine, Cook, Laura, Garcia, Rosa V., Loyal, Jackson, Kim, Peter T.W. +3 more·2021·Cell Stem Cell

Abstract

An open-label, first-in-human phase 1/2 study is being conducted to evaluate the safety and efficacy of pancreatic endoderm cells (PECs) implanted in non-immunoprotective macroencapsulation devices for the treatment of type 1 diabetes. We report an analysis on 1 year of data from the first cohort of 15 patients from a single trial site that received subcutaneous implantation of cell products combined with an immunosuppressive regimen. Implants were well tolerated with no teratoma formation or severe graft-related adverse events. After implantation, patients had increased fasting C-peptide levels and increased glucose-responsive C-peptide levels and developed mixed meal-stimulated C-peptide secretion. There were immunosuppression-related transient increases in circulating regulatory T cells, PD1 high T cells, and IL17A+CD4+ T cells. Explanted grafts contained cells with a mature β cell phenotype that were immunoreactive for insulin, islet amyloid polypeptide, and MAFA. These data, and associated findings (Shapiro et al., 2021), are the first reported evidence of meal-regulated insulin secretion by differentiated stem cells in patients.

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Crossref · 10.1016/j.stem.2021.10.003

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  • Upon graft removal, a majority of graft-derived cells immunostained for the general endocrine marker chromogranin A (CHGA).

    “Upon graft removal, a majority of these graft-derived cells immunostained for the general endocrine marker chromogranin A (CHGA).”

    From Developments in stem cell-derived islet replacement therapy for treating type 1 diabetes (2023) · cites this paper as [33]

    The Results (page unavailable) report abundant synaptophysin-positive endocrine cell populations in explanted grafts. They do not report chromogranin A (CHGA) staining or establish that a majority of graft-derived cells stained for CHGA. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Facilitating host-derived vascularization into the graft promoted long-term endocrine cell survival and function in humans.

    “While the observed circulating C-peptide levels in these studies were too low to induce a measurable clinical benefit attributable to the transplanted cells, these clinical trials have demonstrated that facilitating host-derived vascularization into the graft promoted long-term endocrine cell survival and function in humans.”

    From Developments in stem cell-derived islet replacement therapy for treating type 1 diabetes (2023) · cites this paper as [33]

    The Introduction (page unavailable) describes devices designed to admit capillaries and reports that implanted cells survived and became functional in patients; the Results (page unavailable) confirm vascularization within the devices. The paper does not establish that vascularization itself promoted those outcomes: its limitations passage (labeled Abstract in our copy; page unavailable) says the uncontrolled trial cannot decisively determine the causal role of individual study components. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • In other regions of the device, host fibroblasts were the predominant cell type, resulting in deposition of fibrotic tissue rather than host-derived vasculature.

    “In other regions of the device, however, host fibroblasts were the predominant cell type, resulting in the deposition of fibrotic tissue rather than host-derived vasculature.”

    From Developments in stem cell-derived islet replacement therapy for treating type 1 diabetes (2023) · cites this paper as [33]

    The Results (page unavailable) report a background of fibrous tissue in all devices and substantial variation in graft cellularity. They do not identify host fibroblasts as the predominant cell type in particular regions or say that fibrosis developed there instead of host-derived vasculature; the Results also report blood vessels and direct vascularization into devices. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Observed circulating C-peptide levels in these studies were too low to induce a measurable clinical benefit attributable to the transplanted cells.

    “While the observed circulating C-peptide levels in these studies were too low to induce a measurable clinical benefit attributable to the transplanted cells, these clinical trials have demonstrated that facilitating host-derived vascularization into the graft promoted long-term endocrine cell survival and function in humans.”

    From Developments in stem cell-derived islet replacement therapy for treating type 1 diabetes (2023) · cites this paper as [33]

    The Discussion (page unavailable) says clinical improvements could not be clearly attributed to graft-derived C-peptide: outcomes did not differ between patients with higher and lower levels, and C-peptide secretion was likely not the major cause of improvement. But it does not establish that the levels were too low to produce any benefit; it suggests that some patients’ levels may be adequate for some clinical benefit. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The porous design promoted the growth of host-derived blood vessels inside the device, and this phenomenon was more prominent in regions containing the graft-derived cells.

    “As intended, the porous design promoted the growth of host-derived blood vessels inside the device, and this phenomenon was more prominent in regions containing the graft-derived cells.”

    From Developments in stem cell-derived islet replacement therapy for treating type 1 diabetes (2023) · cites this paper as [33]

    The Introduction describes portals designed to let capillaries enter the device, and the Results report blood vessels in explanted devices and endothelial staining adjacent to insulin-positive graft cells. The paper does not report that vascular growth was more prominent in regions containing graft-derived cells than elsewhere in the device. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Authors
Ramzy, A., Thompson, D. M., Ward-Hartstonge, K. A., Ivison, S., Cook, L., Garcia, R. V., Loyal, J., Kim, P. T. W., Warnock, G. L., Levings, M. K., & Kieffer, T. J.
Affiliations
University of British Columbia (CA)
Corresponding author
Kieffer, Timothy J.
Venue
Cell Stem Cell
Publisher
Elsevier BV
Published
2021-12
Volume
28
Issue
12
Pages
2047-2061.e5
ISSN
  • 1875-9777 (ISSN-L)
  • 1934-5909
OpenAlex
W3214753991
Cited by
342
References
55
Citations by year
2026: 46 · 2025: 75 · 2024: 75 · 2023: 66 · 2022: 76 · 2021: 3 · 2012: 1
FWCI
51.66
Type
journal article
Language
en
Open access
Locations
  • Cell stem cell (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Canadian Institutes of Health Research
  • Stem Cell Network
  • California Institute for Regenerative Medicine
  • Juvenile Diabetes Research Foundation United States of America
  • BC Children’s Hospital
  • Juvenile Diabetes Research Foundation Canada
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pluripotent Stem Cells Research
Keywords
type 1 diabetes, pluripotent stem cells, cell therapy, macroencapsulation, C-peptide secretion, glucose-dependent insulin secretion, beta cell differentiation, regulatory T cells, immunosuppression, graft safety, amylin, MafA
MeSH terms
C-Peptide, Cell Differentiation, Diabetes Mellitus, Type 1, Endoderm, Glucose, Humans, Insulin, Insulin-Secreting Cells

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