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Tolerogenic Cell-Based Therapy: Where We Stand 2.0?

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Immunology".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 8877

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San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy
Interests: HLA-G; vitamin D3
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Special Issue Information

Dear Colleagues,

The development of novel approaches to control unwanted immune responses represents an ambitious goal in the management of a number of clinical conditions, including autoimmunity, autoinflammatory diseases, organ and cell transplantation allergies, as well as replacement therapies, in which the T-cell response to self, allogeneic, and nonharmful antigens threatens the physiological function of tissues and organs. Current treatments for these conditions rely on the use of nonspecific immunosuppressive agents and supportive therapies, which may efficiently dampen inflammation and compensate for organ dysfunction, but require lifelong treatments that are not devoid of cumbersome side effects. These limitations induced researchers to undertake the development of definitive and specific solutions to these disorders: the underlying principle of the novel approaches relies on the idea that empowering the tolerogenic arm of the immune system would restore the balance and control the disease.

Cell-based therapies are clinically attractive for promoting or restoring tolerance in T-cell-mediated diseases, as they can theoretically control several inflammatory cells, including T and B lymphocytes, NK cells and APCs, leading to the control of unwanted immune responses. Therapies based on the adoptive transfer of regulatory cells (T, macrophages, and tolerogenic (tol)DC) entered the clinical arena in recent years, with the goal of investigating the safety and feasibility of the approach, and several studies are still ongoing.

Despite encouraging results, a number of open questions remain before regulatory-based therapies can be routinely used to prevent graft rejection and treat or cure autoimmune diseases. Several open questions remain to be tackled when designing tolerogenic-based therapies: i) their potential to mediate pan immunosuppression in vivo, due to the phenomenon of bystander immune suppression; ii) the stability of the cell product to be infused must be evaluated for limitations to in vivo side effects or disease exacerbation; iii) the overall impact of long-lasting tolerogenic cells on infections and malignancies; iv) the necessity of multiple cell infusions to allow for the induction of the self-sustained mechanisms described above will invariably lead to high manufacturing costs; iv) the expansion/generation of autologous tolerogenic cells implies the use of patient-derived cells, which may not be as functional as those isolated from healthy subjects.

The purpose of this Research Topic is to define the current advances in understanding of the tolerogenic treatments based on cell products to modulate immune tolerance or autoimmunity. For this purpose, we particularly encourage studies on animal disease models or clinical trials, which will contribute to the future development of clinical treatments using tolerogenic cells to target human diseases.

Dr. Silvia Gregori
Guest Editor

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Keywords

  • tolerance
  • cell-based therapy
  • autoimmune diseases
  • organ transplantation
  • graft-versus host disease
  • regulatory T cells
  • tolerogenic DC
  • immunoregulation

Published Papers (2 papers)

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12 pages, 1035 KiB  
Communication
IL-10-Engineered Dendritic Cells Modulate Allogeneic CD8+ T Cell Responses
by Marta Fortunato, Giada Amodio and Silvia Gregori
Int. J. Mol. Sci. 2023, 24(11), 9128; https://doi.org/10.3390/ijms24119128 - 23 May 2023
Cited by 3 | Viewed by 1410
Abstract
Tolerogenic dendritic cells (tolDC) play a central role in regulating immune homeostasis and in promoting peripheral tolerance. These features render tolDC a promising tool for cell-based approaches aimed at inducing tolerance in T-cell mediated diseases and in allogeneic transplantation. We developed a protocol [...] Read more.
Tolerogenic dendritic cells (tolDC) play a central role in regulating immune homeostasis and in promoting peripheral tolerance. These features render tolDC a promising tool for cell-based approaches aimed at inducing tolerance in T-cell mediated diseases and in allogeneic transplantation. We developed a protocol to generate genetically engineered human tolDC overexpressing IL-10 (DCIL-10) by means of a bidirectional lentiviral vector (LV) encoding for IL-10. DCIL-10 promote allo-specific T regulatory type 1 (Tr1) cells, modulate allogeneic CD4+ T cell responses in vitro and in vivo, and are stable in a pro-inflammatory milieu. In the present study, we investigated the ability of DCIL-10 to modulate cytotoxic CD8+ T cell responses. We demonstrate that DCIL-10 reduces allogeneic CD8+ T cell proliferation and activation in primary mixed lymphocyte reactions (MLR). Moreover, long-term stimulation with DCIL-10 induces allo-specific anergic CD8+ T cells without signs of exhaustion. DCIL-10-primed CD8+ T cells display limited cytotoxic activity. These findings indicate that stable over-expression of IL-10 in human DC leads to a population of cells able to modulate cytotoxic allogeneic CD8+ T cell responses, overall indicating that DCIL-10 represent a promising cellular product for clinical applications aimed at inducing tolerance after transplantation. Full article
(This article belongs to the Special Issue Tolerogenic Cell-Based Therapy: Where We Stand 2.0?)
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22 pages, 2369 KiB  
Review
Dendritic Cells and Their Immunotherapeutic Potential for Treating Type 1 Diabetes
by Farhan Ullah Khan, Puregmaa Khongorzul, Ahmed Aziz Raki, Ashwini Rajasekaran, Denis Gris and Abdelaziz Amrani
Int. J. Mol. Sci. 2022, 23(9), 4885; https://doi.org/10.3390/ijms23094885 - 28 Apr 2022
Cited by 17 | Viewed by 7160
Abstract
Type 1 diabetes (T1D) results from the destruction of pancreatic beta cells through a process that is primarily mediated by T cells. Emerging evidence suggests that dendritic cells (DCs) play a crucial role in initiating and developing this debilitating disease. DCs are professional [...] Read more.
Type 1 diabetes (T1D) results from the destruction of pancreatic beta cells through a process that is primarily mediated by T cells. Emerging evidence suggests that dendritic cells (DCs) play a crucial role in initiating and developing this debilitating disease. DCs are professional antigen-presenting cells with the ability to integrate signals arising from tissue infection or injury that present processed antigens from these sites to naïve T cells in secondary lymphoid organs, thereby triggering naïve T cells to differentiate and modulate adaptive immune responses. Recent advancements in our knowledge of the various subsets of DCs and their cellular structures and methods of orchestration over time have resulted in a better understanding of how the T cell response is shaped. DCs employ various arsenal to maintain their tolerance, including the induction of effector T cell deletion or unresponsiveness and the generation and expansion of regulatory T cell populations. Therapies that suppress the immunogenic effects of dendritic cells by blocking T cell costimulatory pathways and proinflammatory cytokine production are currently being sought. Moreover, new strategies are being developed that can regulate DC differentiation and development and harness the tolerogenic capacity of these cells. Here, in this report, we focus on recent advances in the field of DC immunology and evaluate the prospects of DC-based therapeutic strategies to treat T1D. Full article
(This article belongs to the Special Issue Tolerogenic Cell-Based Therapy: Where We Stand 2.0?)
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