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Association Between SARS-CoV-2 Infection and Immune-Mediated Myopathy in Patients Who Have Died.

IMPORTANCE: Myalgia, increased levels of creatine kinase, and persistent muscle weakness have been reported in patients with COVID-19. OBJE … of skeletal muscle tissue was assessed by quantification of immune cell infiltrates, expression of major histocompatibility complex (MHC) class I and class II antigens on the sarcolemma, and a blinded evaluation on a visual analog scale ranging from absence of pathology to the most pronounced pathology. Inflammation of cardiac muscles was assessed by quantification of immune cel …

A four-step model for the IL-6 amplifier, a regulator of chronic inflammations in tissue-specific MHC class II-associated autoimmune diseases.

It is commonly thought that autoimmune diseases are caused by the breakdown of self-tolerance, which suggests the recognition of specific antigens by autoreactive CD4+ T cells contribute to the specificity of autoimmune diseases (Marrack et al., 2001; Mathis and Benoist, 2004). In several cases, however, even for diseases associated with class II major histocompatibility complex (MHC) alleles, the causative tissue-specific antigens recognized by memory/activated CD4+ T cells have not been established (Mocci et al., 2000; Skapenko et al., 2005). Rheumatoid arthritis (RA) and arthritis in F759 k…

Induction of transient murine T cell anergy by a low molecular weight compound obtained from supernatants of human placental cultures is linked to defective phosphorylation of TCR CD3 chain.

PROBLEM: Allopregnancy induces specific transient tolerance to paternal grafts, and we know that a low molecular weight material ("filtrate") present in a human placental supernatant can do so in vitro (specific unresponsiveness) as well as in vivo, such as when preventing graft-versus-host reaction (GVH) produced by A cells injected into irradiated A x B F1s recipient. We also know by studies carried out using specific anti-V beta-specific stimulation as well as secondary and primary mixed lymphocyte reaction in major histocompatibility complex (MHC) only incompatible combinations that the ma…

Evaluation of HLA-G and Hematobiochemical levels and their association with malaria and miscarriage among pregnant women: A Ghanaian case-control study.

BACKGROUND: HLA-G (Human Leukocyte Antigen-G) is a non-classical molecule belonging to the major histocompatibility complex (MHC) class I family, located on chromosome 6 within the MHC region, which is pivotal in promoting immune tolerance. The immune-suppressive ability of Human Leukocyte Antigen (HLA-G) and its binding to fetal maternal interface predispose pregnant women to Plasmodium falciparum (Pf) infection and pregnancy loss, respectively. Alterations in hematological parameters may accelerate the severity of malaria infection. Limited data is available about the effects of malaria infe…

Analysis of antiviral functions, differences and apoptotic effects of two novel MHC-Iα genotypes in orange-spotted grouper (Epinephelus coioides).

The Major Histocompatibility Complex (MHC) is a group of tightly linked, highly polymorphic genes that play a critical role in vertebrate immune responses. MHC is closely associated with various diseases, including autoimmune disorders, antigen invasion, and inflammation. Notably, MHC class I (MHC-I) molecules exhibit extensive polymorphism and have the ability to specifically bind to a diverse array of viral antigens, which is crucial for antigen presentation and antiviral immunity. However, studies on the differential functions of different MHC-I genotypes in response to fish viral diseases …

Reinforcement of cell-mediated immunity driven by tumor-associated Epstein-Barr virus (EBV)-specific T cells during targeted B-cell therapy with rituximab.

INTRODUCTION: In immunocompromised patients, Epstein-Barr virus (EBV) infection or reactivation is associated with increased morbidity and m … athway, B-LCLs were shown to cross-present obtained exogenous ACEBV-derived antigens mainly through major histocompatibility complex (MHC) class I molecules. This mechanism is comparable to that for DCs and B cells and resulted in a strong EBV-specific CD8+ cytotoxic T-cell response. Stimulation with ACEBV-loaded APCs also led to the activation of CD4+ T helper cells, suggesting …

Increased apoptosis of immunoreactive host cells and augmented donor leukocyte chimerism, not sustained inhibition of B7 molecule expression are associated with prolonged cardiac allograft survival in mice preconditioned with immature donor dendritic cells plus anti-CD40L mAb.

BACKGROUND: We previously reported the association among donor leukocyte chimerism, apoptosis of presumedly IL-2-deficient graft-infiltratin … f anti-CD40L mAb. Donor cells were detected posttransplantation by immunohistochemical staining for major histocompatibility complex class II (I-Ab) in the cells of recipient lymphoid tissue. CM expression was determined by two-color labeling. Host responses to donor alloantigen were quantified by mixed leukocyte reaction, and cytotoxic T lymphocyte (CTL) assays. Apoptotic death …

Contributions of donor and host blood vessels in CNS allografts.

The contributions of blood vessels in various transplantation paradigms of solid CNS tissue or cell suspension allografts placed into adult host brains were investigated immunohistochemically using the PVG-RT1C and PVG-RT1U inbred rat strains and a panel of highly specific monoclonal antibodies. The monoclonal antibodies included OX-27 and U9F4 against major histocompatibility complex (MHC) class I antigens of the PVG-RT1C and PVG-RT1U rats, respectively; OX-26 against the rat transferrin receptor located on blood-brain barrier (BBB) endothelia; and OX-7 against rat neuronal Thy 1.1 for evalua…

Emerging views of mitophagy in immunity and autoimmune diseases.

Mitophagy is a vital form of autophagy for selective removal of dysfunctional or redundant mitochondria. Accumulating evidence implicates el … tochondrial antiviral signaling protein; MDV: mitochondria-derived vesicle; MFN1: mitofusin 1; MHC: major histocompatibility complex; MIF: macrophage migration inhibitory factor; mtAP: mitochondrial antigen presentation; mtDNA: mitochondrial DNA; MTOR: mechanistic target of rapamycin kinase; mtROS: mitochondrial ROS; MUL1: mitochondrial E3 ubiquitin protein ligase 1; NBR1: NBR1 a …

The magnocellular theory of developmental dyslexia.

Low literacy is termed 'developmental dyslexia' when reading is significantly behind that expected from the intelligence quotient (IQ) in th … development of magnocells throughout the brain. The best understood linkage is to the region of the Major Histocompatibility Complex (MHC) Class 1 on the short arm of chromosome 6 which helps to control the production of antibodies. The development of magnocells may be impaired by autoantibodies affecting the developing brain. Magnocells also need high amounts of polyunsaturated …

[Rudolf-Virchow Prize 1998. Award lecture. Toxoplasmosis: a model infection for studying systemic and intracerebral immune reactions].

Toxoplasmosis has gained particular attention in the AIDS era as the most common opportunistic encephalitis in HIV-infected patients. Since … N-gamma-receptor-deficient mice were unable to activate their macrophages as evidenced by a lack of major histocompatibility complex (MHC) class II antigen induction and the absence of an upregulation of tumor necrosis factor (TNF)-alpha and inducible nitric oxide synthase (iNOS) mRNA transcripts, two macrophage effector molecules. These observations prompted the investigation of …

Central administration of methotrexate reduces mechanical allodynia in an animal model of radiculopathy/sciatica.

We have recently reported that injury to a lumbar root in a rat model of radiculopathy produces spinal glial activation associated with elev … glial marker) and glial fibrillary acidic protein (GFAP: astrocytic marker) and for the presence of Major Histocompatibility Complex (MHC) Class II expression. Group C (Sham+MTX) did not demonstrate any evidence of gait disturbance or mechanical allodynia after MTX administration. The rats in group B (Surgery+Saline) demonstrated mechanical allodynia from one day postsurgery to t …

Lymphoid tissue targeting of anti-HIV drugs using liposomes.

Considering that HIV-1 accumulates and replicates actively within lymphoid tissues, any strategy that will decrease viral stores in these tissues might be beneficial to the infected host. Follicular dendritic cells (FDC), B lymphocytes, antigen-presenting cells like macrophages, and activated CD4(+) T cells are abundant in lymphoid tissues, and all express substantial levels of the HLA-DR determinant of the major histocompatibility complex class II (MHC-II). Monocyte-derived macrophages, which are also CD4(+) and express HLA-DR, are considered to be the most frequent hosts of HIV-1 in tissues …

Cutaneous T cell lymphoma: the helping hand of dendritic cells.

Since its introduction 25 years ago, cutaneous T cell lymphoma has become the preferred designation for clonal malignancies of those CD4 thy … ive signaling from dendritic cells (DCs) via presentation of antigenic peptides as part of class II major histocompatibility complexes to antigen-specific T cell receptors (TCRs), it seems likely that CTCL is a clonal proliferation of T cells responding to specific antigenic stimulation from LCs. This is supported by our recent finding that CTCL cells proliferate in vitro in resp …

HLA Class I protein expression in the human placenta.

The maternal tolerance to the semiallogeneic fetus is still a central theme in reproductive immunology. During placentation, fetally-derived … o define the antigenic status of the placental cells, in particular with respect to antigens of the Major Histocompatibility complex. The role of the highly polymorphic classical class I molecules HLA -A, -B, -C, which are expressed on almost all somatic cells, is the induction of a specific immune response by presenting peptide antigens to T cells. In contrast, the non-classical …

Hematopoietic chimerism and transplantation tolerance: a role for regulatory T cells.

The immunosuppressive regimens currently used in transplantation to prevent allograft destruction by the host's immune system have deleterious side effects and fail to control chronic rejection processes. Induction of donor-specific non-responsiveness (i.e., immunological tolerance) to transplants would solve these problems and would substantially ameliorate patients' quality of life. It has been proposed that bone marrow or hematopoietic stem-cell transplantation, and resulting (mixed) hematopoietic chimerism, lead to immunological tolerance to organs of the same donor. However, a careful ana

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… A T cell receptor V beta segment that imparts reactivity to a class II major histocompatibility complex product . Cell 49 , 263 – 271 10.1016/0092-8674(87)90567-8 3471350 Kappler J. W. Staerz U. White J. Marrack P. C. ( 1988 ). … Self-tolerance eliminates T cells specific for Mls-modified products of the major histocompatibility complex . Nature 332 , 35 – 40 10.1038/332035a0 3126396 Karim M. Feng G. Wood K. J. Bushell A. R. ( 2005 ). …

Протеомический анализ показывает, что потенциальные молекулы могут выступать посредником в кортикальной патологии и выявлять возможные биомаркеры в животной модели множественного склероза.

ВВЕДЕНИЕ: Множественный склероз (MS) представляет собой сложное нейродегенеративное заболевание, характеризующееся повторяющимися вспышками, обезвоживанием, повреждением аксона и последующей потерей функции. MS представляет широкий спектр клинических курсов, прогрессивные формы которых приводят к необратимой неврологической инвалидности. Кортикальные демиелионирующие повреждения имеют ключевое значение для патологии этих прогрессивных форм, и в последние десятилетия они приобретают решающее значение в силу их тесной связи с физической инвалидностью и когнитивным упадком. Несмотря на это, механ

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… Finally, cortical demyelination was exclusively observed in EAE-susceptible non-major histocompatibility complex (MHC)-congenic LEW rat strains and EAE rat strains with a permissive LEW[U2] [C3]. …

Increased Indoleamine 2, 3-Dioxygenase expression modulates Th1/Th17/Th22 and Treg pathway in humans with Helicobacter Pylori-Infected gastric mucosa.

Introduction and purposeIndoleamine 2, 3- dioxygenase (IDO) plays an importantrole in immunosuppressive pathway, as inhibits responsesof T cells and promotes immune tolerance. Host responsetoHelicobacter pylori (H. pylori) is involved in the infection persistenceand it is also associatedwith different clinical outcomes. The aim of this study was to investigate the role of IDO in H. pylori-infected patients with gastritis diseases and peptic ulcer diseases (PUD) through the assessment of the relationship among IDO protein expression and the numbers of T helper (Th)-1, Th17, Th22, and T regulato

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… Immunogenetics A branch of science representing the boundary between immunology and genetics and dealing with the genetic analysis of executive and regulatory molecules of the immune system (especially antigens of the major histocompatibility complex, immunoglobulins, cytokines and components and factors … Currently, there are more than 40 known members of this superfamily whose basic functions are discriminative (immunoglobulins, antigenic receptors on T cells, antigens of class I and II of the major histocompatibility complex, differentiation antigens CD2, CD3, CD4, CD8 and receptors for Fc domain of …

History of hematopoietic cell transplantation: challenges and progress.

After more than 60 years of research in allogeneic hematopoietic cell transplantation (HCT), this therapy has advanced from one that was declared dead in the 1960s to a standard treatment of otherwise fatal malignant and non-malignant blood diseases. To date, close to 1.5 million hematopoietic cell transplants have been performed in more than 1,500 transplantation centers worldwide. This review will highlight the enormous efforts by numerous investigators throughout the world who have brought the experimental field of HCT to clinical reality, examine ongoing challenges, and provide insights fo

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… The early transplants were based on observations in inbred mice, for which major histocompatibility complex (MHC) matching was not an absolute requirement. …