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Umbilical cord blood and cord tissue banking as somatic stem cell resources to support medical cell modalities

Inflammation and Regeneration volume 43, Article number: 59 (2023) Cite this article

Abstract

Human umbilical cord blood (CB) and umbilical cord tissue (UC) are attractive sources of somatic stem cells for gene and cell therapies. CB and UC can be obtained noninvasively from donors. CB, a known source of hematopoietic stem cells for transplantation, has attracted attention as a new source of immune cells, including universal chimeric antigen receptor-T cell therapy (CAR-T) and, more recently, universal CAR-natural killer cells. UC-derived mesenchymal stromal cells (UC-MSCs) have a higher proliferation potency than those derived from adult tissues and can be used anon-HLA restrictively. UC-MSCs meet the MSC criteria outlined by the International Society of Gene and Cellular Therapy. UC-MSCs are negative for HLA-DR, CD80, and CD86 and have an immunosuppressive ability that mitigates the proliferation of activated lymphocytes through secreting indoleamine 2,3-dioxygenase 1 and prostaglandin E2, and the expression of PD-L2 and PD-L1. We established the off-the-shelf cord blood/cord bank IMSUT CORD to support novel cell therapy modalities, including the CB-derived immune cells, MSCs, MSCs-derived extracellular vesicles, biological carriers loaded with chemotherapy drugs, prodrug, oncolytic viruses, nanoparticles, human artificial chromosome, combinational products with a scaffold, bio3D printing, and so on.

Background

Human umbilical cord blood (CB) has been a well-known source of hematopoietic stem cells (HSCs) for over 25 years. In the present day, CB transplantations are implemented more than 1200 per year in Japan (http://www.jdchct.or.jp/data/report/2022/). However, the number of CB transplantations (CBT) in European countries (EU) is decreasing, instead, the HLA-haploidentical allogeneic HSC transplantation has become popular in the EU rather than CBT. The reason why HLA-haploidentical relatives have become rapidly available sources of HSCs is that prevention methods for acute graft-versus-host disease (aGVHD), mainly post-transplant cyclophosphamide administration, resulting in the removal of alloreactive T cells in the patients [1]. CB is currently the optimal source for immunotherapy using activated T cells, regulatory T cells, and natural killer (NK) cells, with or without genetic modifications. Additionally, there has been an overwhelming interest in mesenchymal stromal cells (MSCs) for immunotherapy and regenerative medicine, although CBs are limited in volume to obtain an adequate number of MSCs. MSCs can be isolated from any tissue in the body, but currently, the major sources of MSCs include the bone marrow (BM), adipose tissue (AD), and umbilical cord (UC) [2]. Among these cell sources, human UC has been rapidly utilized as an abundant source of MSCs worldwide due to its ease of collection, noninvasive collection procedure, and categorization as biological waste at birth. Moreover, it is the youngest nonsenescent human tissue except for ES cells. This review focuses on CB- and UC-derived cells as a source of sustainable material for new modalities in gene and cell therapy.

Characteristics and therapeutic potentials of CB and UC-MSCs

CB has been well-investigated and is known to include a relatively high potential of CD34-positive cells to be expanded, more naïve CD45RA-positive T cell ratios, and more potent suppressor function of regulatory T cells than adult peripheral blood [3, 4].

UC-MSCs meet the criteria of MSCs defined by The International Society for Gene and Cellular Therapy [5, 6]. First, they are plastically adherent when maintained in a standard culture medium supplemented with serum. Second, they are positive for CD105, CD73, and CD90 but negative for CD45, CD34, CD14 or CD11b, CD79α or CD19, and HLA-DR surface molecules. Third, MSCs cannot differentiate into adipocytes, chondrocytes, and osteoblasts in vitro.

Additionally, immunosuppressive abilities and tissue repair are the most important properties of MSCs for clinical use [7]. However, MSCs are activated to suppress the immune system only upon the inflammatory stimuli, including activated T cells, PHA-L, and IFN-γ. He et al. demonstrated that third-party UC-MSCs suppress the proliferation of CD4 and CD8-positive cells activated by allogeneic dendritic cells or inflammatory reagents [8]. Secreted factors such as indoleamine 2, 3-dioxygenase 1, and PGE2 are induced in UC-MSCs by the inflammatory environment and play a critical role in controlling excess immune system [9]. UC-MSCs constitutively express the PD-L2, while PD-L1 is induced in response to IFN-γ [10]. Furthermore, like BM- and AD-derived MSCs, MSCs are negative for HLA class II expression and the co-stimulatory surface antigens CD80 and CD86, which activate T cells [11]. UC-MSCs remain negative for HLA-DR even in the presence of IFN-γ, while HLA-DR on BM-MSCs can be induced upon IFN-γ stimuli [8]. As a result, these cells escape from activated T cells and are utilized in a non-HLA-restricted manner. Because of these anti-inflammatory properties, MSCs may be useful therapeutic candidates for the treatment of inflammatory disorders.

Another important characteristic of UC-MSCs is their ability to repair tissues. Kurtzberg et al. reported that autologous CB may be effective in mitigating the symptoms of cerebral palsy after birth. CD34-positive cells in the CB play a critical role in treating cerebral palsy, and clinical trials using autologous CB for hypoxic–ischemic encephalopathy (HIE) has been performed in Japan [12]. However, collecting adequate amounts of CB for therapeutic interventions is difficult. Recently, allogeneic UC-MSCs have become an attractive source to overcome the disadvantages of CB collection [13]. Causes of cerebral palsy include periventricular leukomalacia (PVL), periventricular hemorrhage, and HIE. However, a common mechanism of cerebral palsy is the early phase of inflammation caused by hypoxia, glucose depletion, and microglia dysfunction with reactive oxygen species, followed by neurogenic damage [13]. The excess inflammation and tissue damage in the pathological cascade are expected to be controlled by MSCs. We previously found that UC-MSCs migrate toward the injured site of the brain after tracking in the lungs, although MSCs do not engraft and disappear after 3 weeks of intravenous injection. UC-MSCs secrete neurotrophic factors such as brain-derived neurotrophic factor and hepatocyte growth factor, and attenuate mice brain injury [14, 15]. These characteristics of UC-MSCs described above are expected to contribute to the development of treatments in the fields of immunotherapy and regenerative medicine.

Umbilical cord blood and cord bank

Establishing a stable supply system for CB- and UC-MSCs is critical for implementing regenerative and immunotherapies. For this purpose, The Institute of Medical Science, The University of Tokyo (IMSUT), has established the cord blood/cord bank IMSUT CORD as a new type of public biobank to supply “off-the-shelf” frozen CB, UC tissues, and UC-derived cells. Briefly, the IMSUT CORD collected both CB and UC data after obtaining informed consent from the guardian of the baby (Fig. 1). In addition to obtaining informed consent, questionnaires about the medical history, genetic history of the baby donor’s family, and history of the mother’s communicable disease risk behavior were collected. CB and UC were collected, and the mother’s blood was tested for infection. These documentation and tests in CB banks can also be referred to as UC banking, although additional infection-related tests for UC banking are strictly required. The collected CB and UC are transported from the hospitals to the CB/UC bank and the IMSUT CORD cryopreserves UC tissue [16] until obtaining confirmation that the baby exhibits healthy, normal development and the mother remains free from infection within at least 6 months after delivery.

Fig. 1
figure 1

Overall flow of the off-the-shelf cord blood/cord bank, IMSUT CORD to support the clinical and research use

Full size image

The IMSUT CORD processes and freezes CB into frozen enriched cells, while freezes the UC tissue and cultures the frozen-thawed UC tissue into master cells, intermediate cell products, or final cell products, according to the physician’s or company’s requirements of cell modalities.

Clinical trials using UC-MSCs for severe acute GVHD and others

Table 1 shows the reports of clinical trials for severe acute graft-versus-host disease (aGVHD) using UC-MSCs [10, 17]. Not like BM-MSCs, there are only two studies to treat severe aGVHD using UC-MSCs including the author’s one. Here, we introduce our physician-initiated clinical trial for severe aGVHD using allogeneic UC-MSCs (IMSUT-CORD) manufactured in serum-free medium and cryoprotectant from 2018 to 2020 in Japan [10]. In a phase I dose-escalation clinical trial, IMSUT-CORD was administered 1 × 106 cells/kg or 2 × 106 cells /kg intravenously twice per week over 2 cycles. Patients with no adverse effects, partial response (PR), or mixed response (MR) underwent up to two additional cycles. No severe adverse events were observed; at 16 weeks after the initial IMSUT-CORD infusion, one patient showed no response, while one showed MR, two showed PR, and three showed a complete response (CR). The overall response was 71.4% (90% CI 34.1–94.7%), while the overall survival was 85.7% (90% CI 62.2–100%). The continuous CR/PR rate was 100% for > 28 days after CR/PR, while the survival rate was 85.7% on day 100 (90% CI 62.2–100). The overall response rate (ORR) of 70% reported by Soder RP. et al. was similar that of ours. These high ORR and less toxicity show the necessity of conducting further clinical trials. Table 1 shows the reports of clinical trials using UC-MSCs. The overall response rate (ORR) of 70% reported by Soder RP., et al. was similar that of ours. These high ORR and less toxicity show the necessity of conducting further clinical trials.

Table 1 Clinical trials using allogeneic umbilical cord-derived mesenchymal stromal cells for acute GVHD
Full size table

Other implementations of clinical trials using IMSUT-CORD include phase I clinical trial for COVID-19-related acute respiratory distress syndrome (ARDS), phase I clinical trial for cerebral palsy, and phase II clinical for post-hematopoietic transplantation non-infectious pulmonary complication in Japan. While all three clinical trials were closed, the results have not been published yet.

In our COVID-19-related ARDS study, there are six publications in the world (Table 2) [18,19,20,21,22,23]. Among three phase II clinical trials for COVID-19-related ARDS, one showed an improvement in survival rate significantly [19], while two did not [18, 20].

Table 2 Clinical trials using allogeneic umbilical cord-derived mesenchymal stromal cells for COVID-19-related ARDS and cerebral palsy
Full size table

In clinical trials for cerebral palsy, there is only one publication of phase I, a pilot study, for moderate to severe hypoxic ischemic encephalopathy (HIE) [24]. Six neonates with moderate (4) or severe (2) HIE were enrolled and received one dose of UC-MSCs during HIE and 2 received a 2nd dose 2 months later. All babies survived with average to low-average developmental assessment standards scores for ages between 12 and 17 postnatal months. No severe adverse events were reported in all papers, although 5/6 babies developed low titer anti-HLA antibodies.

As for post-hematopoietic transplantation non-infectious pulmonary complication, no report was found.

CB and UC for exploring new cell modalities

CB and UC-MSCs

Although the use of CB for hematopoietic stem cell transplantation has decreased recently in the world [1], new technologies have promoted the use of expanded CD34 + cells for HSCT [25], regulatory T cells to induce tolerance in HSCT [26, 27], universal chimeric antigen receptor-T cell therapy (CAR-T) [28], and universal CAR-NK cells [29,30,31,32] for hematological malignancies.

In addition to the clinical trials using UC-MSCs introduced in Tables 1 and 2, there are accumulating early-phase clinical trials using UC-MSCs [17, 20, 23, 33,34,35] for engraftment facilitation in HSCT for aplastic anemia [36], neurogenic injuries, diabetes mellitus (DM), heart and angioplasty, liver damage including liver cirrhosis, inflammatory bowel diseases such as Crohn’s disease and ulcerative colitis, prevention of acute rejection in renal transplantation, and collagen diseases [33]. The number of relevant clinical trials on the NIH clinical trial website (https://00m.in/HHVJP) has increased up to 95 trials, including complete, recruiting, and not-yet-recruiting status, as of the end of May 2023.

UC-MSCs-derived extracellular vesicles (EVs)

EVs derived from MSCs might be expected to have effects comparable to those of their parental cells. When parental cells exert therapeutic potency, their EVs may carry the key functional molecules by priming [37, 38]. EV therapy is an emerging type of next-generation cell therapy, but properly testing the safety and efficacy of EVs is challenging. Recently, Rohde et al. proposed clinical testing for the manufacture and characterization of EVs derived from UC-MSCs [39]. The number of preclinical proof-of-concept reports using EVs derived from UC-MSCs is increasing. Chu M. et al. reported the result of a phase 1 clinical trial of nebulization of UC-MSCs derived exosome for patients with COVID-19 pneumonia [40]. The dose of exosome was the same amount of MSCs proportional to the patient’s body weight (1 × 106 cells/kg), and the concentration of exosomes for nebulization ranged from 7.66e + 0.8 to 7.00e + 0.7 particles/ml based on NanoSight. Promoted the absorption of pulmonary lesions and reduced the duration of hospitalization for mild cases of COVID-19 pneumonia were observed with no adverse events.

Other clinical trials using exosomes from UC-MSCs listed on Clinicaltrials.gov are summarized in Table 3. Target diseases are various, such as COVID-19-related diseases, multiple organ dysfunction syndrome after surgical repair of acute type A aortic dissection liver cirrhosis, and retinitis. Out of six clinical trials, one is in a phase II/III study, and another one is in a phase II study. The exosome therapies may be developed rapidly in the near future.

Table 3 Clinical trials of exosome listed on ClinicalTrials.gov
Full size table

Other modalities

Although UC-MSCs differentiate into osteocytes less frequently than BM-MSCs, tissue engineering with scaffolds such as poly (D, L-lactide-co-glycolide) has been shown to facilitate UC-MSC osteogenesis in a mouse model [41].

Recently, Ikeguchi et al. reported the first clinical application of a Bio three-dimensional (3D) nerve conduit made from a spheroid of human fibroblasts [42] using a bio 3D printer to treat peripheral nerve injury [43], although not yet constructed with UC-MSCs.

UC-MSCs or UC-derived cells can be modified by gene transfer; however, this has not yet been achieved at the clinical level. Meshizuka et al. demonstrated that the CRISPR/Cas9- and AAV-mediated insertion of the beta2 microglobulin-HLA-G fusion gene protected UC-MSCs from allogeneic rejection in a GVHD setting in vitro [44].

MSCs migrate to the tumor microenvironment (TME) and promote tumor cell generation, mainly through the cross-talk of tumor parenchymal cells, tumor-associated fibroblasts, cytokines, and chemokines in the TME, secreting transforming growth factor-β and VEGF recruiting regulatory T cells. Owing to their accessibility, UC-MSCs may be modified and processed into effective biological carriers for loading with chemotherapy drugs, prodrugs, oncolytic viruses [45,46,47], nanoparticles, and human artificial chromosomes [48].

Many studies have been conducted to determine the efficacy of proof-of-concept in treating unmet diseases using CB and UC-MSCs, or their new modality cells.

Conclusions

Both human umbilical CB and UC can serve as effective “off-the-shelf” sustainable sources for gene and cell therapies in immunotherapies and regenerative medicine.

Availability of data and materials

The review does not include patient data; however, data and materials related to banking are made available. Requests may be sent to crc-bank@ims.u-tokyo.ac.jp.

Abbreviations

AD:

Adipose tissue

aGVHD:

Acute graft-versus-host disease

ARDS:

Acute respiratory distress syndrome

BM:

Bone marrow

CAR-T:

Chimeric antigen receptor-T cell therapy

CB:

Umbilical cord blood

CR:

Complete response

DM:

Diabetes mellitus

EVs:

Extracellular vesicles

HIE:

Hypoxic–ischemic encephalopathy

HSCs:

Hematopoietic stem cells

HSCT:

Hematopoietic stem cell transplantation

IMSUT CORD:

The Institute of Medical Science cord blood/cord bank

MR:

Mixed response

MSCs:

Mesenchymal stromal cells

NK:

Natural killer

PR:

Partial response

TME:

Tumor microenvironment UC, umbilical cord

UC:

Umbilical cord tissue

UC-MSC:

Umbilical cord-derived mesenchymal stromal cells

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Acknowledgements

We thank the IMSUT CORD staff for working on CB and UC banking. We thank Sugita M. and the staff at NTT Medical Center Hospital (Tokyo, Japan) and Yamaguchi S. and the staff at Yamaguchi Hospital for performing UC tissue and CB collection after obtaining informed consent.

Funding

This work was supported by the Japan Agency for Medical Research and Development (AMED) (Project Numbers: 21be0804004h0001, 22be0804004h0002,23be0804004h0003).

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Authors and Affiliations

  1. Department of Cell Processing and Transfusion, Research Hospital, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan

    Tokiko Nagamura-Inoue

  2. IMSUT CORD, Research Hospital, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan

    Tokiko Nagamura-Inoue & Fumitaka Nagamura

  3. Division of Advanced Medicine Promotion, The Advanced Clinical Center, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan

    Fumitaka Nagamura

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Contributions

TNI and FN wrote the review collecting the papers and references. Both authors read and approved the final manuscript.

Corresponding author

Correspondence to Tokiko Nagamura-Inoue.

Ethics declarations

Ethics approval and consent to participate

The collection, storage, and release, including safety and quality management, of CB and UC samples were approved by the Ethics Committee of the Institute of Medical Science, University of Tokyo (IMSUT) Hospital (IRB#35–2).

Consent for publication

This manuscript has not been published previously or is not under consideration for publication elsewhere. The authors have read the review manuscript and approved its submission.

Competing interests

This study was partially supported by a joint research study by the University of Tokyo and Human Life Cord Japan Inc. in the development of banking and clinical applications (September 2017). Nagamura-Inoue is a senior medical advisor at Human Life Cord Japan Inc.

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Nagamura-Inoue, T., Nagamura, F. Umbilical cord blood and cord tissue banking as somatic stem cell resources to support medical cell modalities. Inflamm Regener 43, 59 (2023). https://doi.org/10.1186/s41232-023-00311-4

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  • DOI: https://doi.org/10.1186/s41232-023-00311-4

Keywords

Inflammation and Regeneration

ISSN: 1880-8190

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