Ryutaro Kajihara

ORCID: 0000-0003-0908-2543
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About
Contact & Profiles
Research Areas
  • Immunotherapy and Immune Responses
  • Cancer Immunotherapy and Biomarkers
  • CAR-T cell therapy research
  • Cancer Research and Treatments
  • Chemokine receptors and signaling
  • Immune cells in cancer
  • Cancer Cells and Metastasis
  • Neurogenesis and neuroplasticity mechanisms
  • Lysosomal Storage Disorders Research
  • Nerve injury and regeneration
  • Glycosylation and Glycoproteins Research
  • Immune Cell Function and Interaction
  • Stress Responses and Cortisol
  • Single-cell and spatial transcriptomics
  • Ubiquitin and proteasome pathways
  • Pluripotent Stem Cells Research
  • T-cell and B-cell Immunology
  • Phagocytosis and Immune Regulation
  • CRISPR and Genetic Engineering
  • Tryptophan and brain disorders
  • Cell death mechanisms and regulation
  • ATP Synthase and ATPases Research
  • NF-κB Signaling Pathways
  • Brain Metastases and Treatment
  • Smart Grid Security and Resilience

Kumamoto University
2010-2025

Roswell Park Comprehensive Cancer Center
2021-2025

Kyoto Institute of Technology
2018

RMIT University
2014

Kumamoto Health Science University
2010

Both the brain-derived neurotrophic factor (BDNF) and glucocorticoids (GCs) play multiple roles in various aspects of neurons, including cell survival synaptic function. BDNF its receptor TrkB are extensively expressed neurons central nervous system (CNS), contribution BDNF/TrkB to neuronal function is evident; thus, downregulation has been considered be involved pathogenesis Alzheimer’s disease (AD). GCs, stress-related molecules, glucocorticoid receptors (GRs) also associated with AD...

10.3390/ijms25031596 article EN International Journal of Molecular Sciences 2024-01-27

Background Dendritic cells (DCs) play critical roles in regulating the innate and adaptive immune responses, have long been a major focus of cancer immunotherapy. Accumulating evidence suggests that conventional type 1 DCs (cDC1s) excel cross-presentation exogenous antigens on MHC-I molecules induction antitumor CD8 + T cell immunity; however, obtaining large numbers cDC1s is difficult. The use reprogramming differentiation technology advantageous for unlimited autologous especially...

10.1136/jitc-2021-003827 article EN cc-by-nc Journal for ImmunoTherapy of Cancer 2022-01-01

Background Dendritic cells (DCs) are a promising therapeutic target in cancer immunotherapy given their ability to prime antigen-specific T cells, and initiate antitumor immune response. A major obstacle for DC-based is the difficulty obtain sufficient number of functional DCs. Theoretically, this limitation can be overcome by using induced pluripotent stem (iPSCs); however, strategies engage iPSC-derived DCs (iPSC-DCs) into remain elucidated. Accumulating evidence showing that induction...

10.1136/jitc-2021-002432 article EN cc-by-nc Journal for ImmunoTherapy of Cancer 2021-05-01

Lack of reliable predictive biomarkers is a major limitation combination therapy with chemotherapy and anti–programmed cell death protein 1/programmed death-ligand 1 (anti-PD-1/PD-L1) (chemo-immunotherapy). We previously observed that the increase peripheral blood CD8+ T cells expressing CX3CR1, marker differentiation, correlates response to anti–PD-1 therapy; however, prognostic value T-cell CX3CR1 expression during chemo-immunotherapy unknown. Here, we evaluated utility circulating...

10.1158/2767-9764.crc-22-0383 article EN cc-by Cancer Research Communications 2023-02-23

Evidence has shown that T-cell receptors (TCRs) recognize the same epitopes may not be exact TCR clonotypes but have slightly different sequences. However, changes in genomic and transcriptomic signatures of these highly homologous T cells during immunotherapy remain unknown. Here, we examined evolutionary features circulating observed tumors (tumor-infiltrating lymphocyte (TIL)-TCRs) by combining single-cell RNA/TCR sequencing longitudinal blood samples tumor tissue from a patient treated...

10.1136/jitc-2024-010092 article EN cc-by-nc-nd Journal for ImmunoTherapy of Cancer 2025-01-01

Tay–Sachs disease (TSD) is a GM2 gangliosidosis lysosomal storage caused by loss of hexosaminidase-A (HEXA) activity and characterized progressive neurodegeneration due to the massive accumulation ganglioside in brain. Here, we generated iPSCs derived from patients with TSD, found similar potential for neural differentiation between TSD-iPSCs normal iPSCs, although progenitor cells (NPCs) exhibited enlarged lysosomes upregulation marker, LAMP1, ganglioside. The NPCs also had an increased...

10.1016/j.neuroscience.2019.06.026 article EN cc-by-nc-nd Neuroscience 2019-07-05

GM1 gangliosidosis is a lysosomal storage disease caused by loss of β-galactosidase activity and characterized progressive neurodegeneration due to massive accumulation ganglioside in the brain. Here, we generated induced pluripotent stem cells (iPSCs) derived from patients with gangliosidosis, resultant neurons showed impaired neurotransmitter release as presynaptic function ganglioside. Treatment normal also disturbed function. A high-content drug-screening system was then established...

10.1016/j.stemcr.2020.03.012 article EN cc-by Stem Cell Reports 2020-04-16

Abstract Crosslinking BCR in the immature B cell line WEHI-231 causes apoptosis. We found that Bcl-xL was degraded by polyubiquitination upon crosslinking and this study explored mechanism controls degradation of Bcl-xL. Ser62 phosphorylated JNK to trigger polyubiquitination, opposed serine/threonine protein phosphatase 6 (PP6) physically associated with show decreased PP6 activity allow phosphorylation CD40 rescues BCR-induced apoptosis, we activation response CD40. Our data suggest is...

10.4049/jimmunol.1302643 article EN The Journal of Immunology 2014-05-08

Neoadjuvant immunotherapy, given before surgical resection, is a promising approach to develop systemic antitumor immunity for the treatment of high-risk resectable disease. Here, using syngeneic and orthotopic mouse models triple-negative breast cancer, we have tested hypothesis that generation tumor-specific T-cell responses by induction activation tumor-residing Batf3-dependent conventional type 1 dendritic cells (cDC1) resection improves control distant metastatic disease survival. Mice...

10.1158/0008-5472.can-21-0939 article EN Cancer Research 2021-10-19

Intralesional therapy is a promising approach for remodeling the immunosuppressive tumor microenvironment while minimizing systemic toxicities. A combinatorial in situ immunomodulation (ISIM) regimen with intratumoral administration of Fms-like tyrosine kinase 3 ligand (Flt3L), local irradiation, and TLR3/CD40 stimulation induces activates conventional type 1 dendritic cells elicits de novo adaptive T cell immunity poorly cell-inflamed tumors. However, impact ISIM on myeloid-derived...

10.4049/jimmunol.2100281 article EN The Journal of Immunology 2021-08-06

Abstract Despite recent progress in therapeutic strategies, prognosis of metastatic triple-negative breast cancer (TNBC) remains dismal. Evidence suggests that the induction and activation tumor-residing conventional type-1 dendritic cells (cDC1s) is critical for generation CD8 + T mediate regression mammary tumors potentiate anti-PD-1/PD-L1 efficacy. However, it unknown whether this strategy effective against TNBC, which poorly responsive to immunotherapy. Here, using a mouse model we...

10.1038/s41598-021-01455-4 article EN cc-by Scientific Reports 2021-11-09

In order to investigate genetic impact of a large amount radionuclides released by the Fukushima Dai-ichi Nuclear Power Plant accident in 2011, we surveyed 2,304 haploid genomes Drosophila melanogaster collected three localities 2012 and 2013 for chromosomal inversions. No unique inversion was found 298 only two 2,006 2013. The observed frequencies were even lower than long-term average frequency inversions Japan. common cosmopolitan also examined Fukushima, Kyoto, Iriomote (Okinawa) 2012....

10.1371/journal.pone.0192096 article EN cc-by PLoS ONE 2018-02-08

Sialidosis is a neuropathic lysosomal storage disease caused by deficiency in the NEU1 gene-encoding neuraminidase and characterized abnormal accumulation of undigested sialyl-oligoconjugates systemic organs including brain. Although patients exhibit neurological symptoms, underlying neuropathological mechanism remains unclear. Here, we generated induced pluripotent stem cells (iPSCs) from skin fibroblasts with sialidosis differentiation into neural progenitor (NPCs) neurons. NPCs neurons...

10.1016/j.nbd.2021.105279 article EN cc-by Neurobiology of Disease 2021-01-29

Both brain-derived neurotrophic factor (BDNF) and glucocorticoids (GCs) have multiple roles in the various aspects of neurons, including cell survival synaptic function. BDNF its receptor TrkB express central nervous system (CNS) neurons extensively, contribution BDNF/TrkB neuronal function is evident, thus, downregulation has been considered to be involved pathogenesis Alzheimer’s disease (AD). GCs, a stress-related molecule, glucocorticoid (GR) are also associated with AD, addition mental...

10.20944/preprints202312.1174.v1 preprint EN 2023-12-15

Human induced pluripotent stem cells (iPSCs) and their progeny displaying tissue-specific characteristics have paved the way for regenerative medicine research in various fields such as elucidation of pathological mechanism diseases discovery drug candidates. iPSC-derived neurons are particularly valuable it is difficult to analyze neural obtained from central nervous system humans. For neuronal induction with iPSCs, one commonly used approaches isolation expansion rosettes, following...

10.21769/bioprotoc.3914 article EN BIO-PROTOCOL 2021-01-01

Among neurotrophins, which are composed of nerve growth factor (NGF), brain-derived neurotrophic (BDNF), neurotrophin-3 (NT-3), and neurotrophin-4 (NT-4/5), BDNF has been extensively studied for its physiological role in cell survival synaptic regulation the central nervous system (CNS) neurons. binds to TrkB (a tyrosine kinase) with high affinity resulting downstream intracellular signaling cascades play crucial roles determining fate, including neuronal differentiation maturation CNS It...

10.20944/preprints202412.2413.v1 preprint EN 2024-12-30

<p>Supplementary Figure 4. Related to Fig. 2, 3 and Supplementary 5-7. 68-year-old female with bilateral lung metastases multiple mediastinal lymph node metastasis was treated chemo-immunotherapy (carboplatin, pemetrexed, pembrolizumab). PD-L1 expression in the pre-treatment tumor specimen 2%. The patient had stable disease for 621 days overall survival > years. A Contrast-enhanced cross-sectional imaging obtained at prior during treatment. B Expression of CX3CR1 peripheral blood...

10.1158/2767-9764.22358070 preprint EN cc-by 2023-03-30
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