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Molecular genetics of hereditary sensory neuropathies.

Hereditary sensory neuropathies (HSN), also known as hereditary sensory and autonomic neuropathies (HSAN), are a clinically and genetically heterogeneous group of disorders. They are caused by neuronal atrophy and degeneration, predominantly affecting peripheral sensory and autonomic neurons. Both congenital and juvenile to adulthood onset is possible. Currently, the classification of the HSN depends on the mode of inheritance, age at onset, and clinical presentation. Hallmark features are progressive sensory loss, chronic skin ulcers, and other skin abnormalities. Spontaneous fractures and ne

Трекеты (Trk-Targeting Drugs): Новинная терапия различных заболеваний.

Многие маршруты могут привести к переходу от здорового к больному фенотипу. Однако не так уж много путей, чтобы двигаться в противоположном направлении, т.е. Таким образом, остается следующий насущный вопрос: каковы патогенные пути и как можно противодействовать им в терапевтических целях? Человеческие клетки содержат >500 белковые киназы и почти 200 белковые фосфаты, действующие на тысячи белков, включая факторы роста клеток. Здесь мы обсуждаем нейтрофины с патогенными или метаботрофными способностями, в частности нейротрофический фактор, полученный из мозга, фактор нервного роста (НГФ), про-

Trafficking the NGF signal: implications for normal and degenerating neurons.

Nerve growth factor (NGF) activates TrkA to trigger signaling events that promote the survival, differentiation and maintenance of neurons. The mechanism(s) that controls the retrograde transport of the NGF signal from axon terminals to neuron cell bodies is not known. The 'signaling endosome' hypothesis stipulates that NGF, TrkA and signaling proteins are retrogradely transported on endocytic vesicles. Here, we provide evidence for the existence of signaling endosomes. Following NGF treatment, clathrin-coated vesicles (CCVs) contain NGF bound to TrkA together with activated signaling proteins

Dysregulated TRK signalling is a therapeutic target in CYLD defective tumours.

Individuals with germline mutations in the tumour-suppressor gene CYLD are at high risk of developing disfiguring cutaneous appendageal tumours, the defining tumour being the highly organised cylindroma. Here, we analysed CYLD mutant tumour genomes by array comparative genomic hybridisation and gene expression microarray analysis. CYLD mutant tumours were characterised by an absence of copy-number aberrations apart from LOH chromosome 16q, the genomic location of the CYLD gene. Gene expression profiling of CYLD mutant tumours showed dysregulated tropomyosin kinase (TRK) signalling, with overex

Oncogenic influences of neurotrophin receptors: Shedding light on Trk biology.

During critical stages of neurodevelopment, tropomyosin receptor kinase receptors, encoded by NTRK genes, exhibit temporally driven differential peaks of expression to properly guide the establishment of the peripheral and central nervous systems. In addition, these neuronal systems exhibit non-canonical regulation of surrounding tissues, impacting organogenesis, homeostasis, plasticity, and regeneration. The same processes that guide neurodevelopment, such as differentiation, plasticity, and neuronal survival, are also hijacked in cancer, making the NTRK family an ideal candidate to study. Th

NTRK Fusion in Non-Small Cell Lung Cancer: Diagnosis, Therapy, and TRK Inhibitor Resistance.

Neurotrophic tropomyosin receptor kinase (NTRK) gene fusion has been identified as an oncogenic driver of various solid tumors, and it is rare in non-smalll cell lung cancer (NSCLC) with a frequency of approximately less than 1%. Next-generation sequencing (NGS) is of priority for detecting NTRK fusions, especially RNA-based NGS. Currently, the tropomyosin receptor kinase (TRK) inhibitors have shown promising efficacy and well tolerance in patients with NTRK fusion-positive solid tumors, regardless of tumor histology. The first-generation TRK inhibitors (larotrectinib and entrectinib) are reco

New Insights into the Pathogenesis of Systemic Mastocytosis.

Mastocytosis is a type of myeloid neoplasm characterized by the clonal, neoplastic proliferation of morphologically and immunophenotypically abnormal mast cells that infiltrate one or more organ systems. Systemic mastocytosis (SM) is a more aggressive variant of mastocytosis with extracutaneous involvement, which might be associated with multi-organ dysfunction or failure and shortened survival. Over 80% of patients with SM carry the KIT D816V mutation. However, the KIT D816V mutation serves as a weak oncogene and appears to be a late event in the pathogenesis of mastocytosis. The management o

Nerve Growth Factor and Autoimmune Diseases.

NGF plays a crucial immunomodulatory role and increased levels are found in numerous tissues during autoimmune states. NGF directly modulates innate and adaptive immune responses of B and T cells and causes the release of neuropeptides and neurotransmitters controlling the immune system activation in inflamed tissues. Evidence suggests that NGF is involved in the pathogenesis of numerous immune diseases including autoimmune thyroiditis, chronic arthritis, multiple sclerosis, systemic lupus erythematosus, mastocytosis, and chronic granulomatous disease. Furthermore, as NGF levels have been link

The influence of neuro-tumor interactions on tumorigenesis and therapeutic response.

The intricate crosstalk between the nervous system and tumors has emerged as a pivotal determinant of tumorigenesis, progression, and therapeutic response. This review synthesizes current insights into neuro-tumor interactions, highlighting how neuronal networks within the tumor microenvironment (TME) modulate cancer cell proliferation, invasion, and angiogenesis by releasing neurotransmitters, growth factors, etc. The neuro-immune axis, a critical interface linking neural signaling to immune regulation, is explored in depth, elucidating how neuronal-derived molecules influence the phenotype a

Bone Pain in Cancer Patients: Mechanisms and Current Treatment.

The skeletal system is the third most common site for cancer metastases, surpassed only by the lungs and liver. Many tumors, especially those of the breast, prostate, lungs, and kidneys, have a strong predilection to metastasize to bone, which causes pain, hypercalcemia, pathological skeletal fractures, compression of the spinal cord or other nervous structures, decreased mobility, and increased mortality. Metastatic cancer-induced bone pain (CIBP) is a type of chronic pain with unique and complex pathophysiology characterized by nociceptive and neuropathic components. Its treatment should be

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… Moreover, tumor cells, stromal cells, and activated immune cells secrete several mediators (endothelin, prostaglandin, NGF, bradykinin, pro-inflammatory cytokines, chemokines, H + , and ATP), which activate appropriate receptors (endothelin receptor, prostaglandin receptor, TrkA receptor, bradykinin … NGF affects its target cells by binding to two types of membrane receptors: TrkA (exclusively specific for NGF) and p75NTR (a receptor common to all neurotrophins) [ 42 ]. …

Targeting the Cancer-Neuronal Crosstalk in the Pancreatic Cancer Microenvironment.

Pancreatic ductal adenocarcinoma (PDAC) represents one of the most aggressive solid tumors with a dismal prognosis and an increasing incidence. At the time of diagnosis, more than 85% of patients are in an unresectable stage. For these patients, chemotherapy can prolong survival by only a few months. Unfortunately, in recent decades, no groundbreaking therapies have emerged for PDAC, thus raising the question of how to identify novel therapeutic druggable targets to improve prognosis. Recently, the tumor microenvironment and especially its neural component has gained increasing interest in the

The Neuro-Bone Axis in Metastatic Progression: Innervation, Neuro-Immune-Osteoclast Crosstalk, and Therapeutic Opportunities.

Bone metastases represent a major cause of morbidity in advanced cancers, yet the neural regulation of metastatic growth within bone remains largely unexplored. The skeletal system is richly innervated by sensory and sympathetic nerve fibers that influence bone remodeling, hematopoiesis, and immune surveillance. Emerging evidence suggests that disseminated tumor cells exploit these neural circuits to create a growth-permissive microenvironment. Tumor-secreted neurotrophic factors can induce nerve sprouting, while sympathetic activation via β-adrenergic receptors promotes osteoclastogenesis, im

Blood Vessels and Peripheral Nerves as Key Players in Cancer Progression and Therapy Resistance.

Cancer cells continuously interact with the tumor microenvironment (TME), a heterogeneous milieu that surrounds the tumor mass and impinges on its phenotype. Among the components of the TME, blood vessels and peripheral nerves have been extensively studied in recent years for their prominent role in tumor development from tumor initiation. Cancer cells were shown to actively promote their own vascularization and innervation through the processes of angiogenesis and axonogenesis. Indeed, sprouting vessels and axons deliver several factors needed by cancer cells to survive and proliferate, inclu

A Randomized Placebo-Controlled Trial of the Anti-Nerve Growth Factor Antibody Tanezumab in Subjects With Cancer Pain Due to Bone Metastasis.

BackgroundThis phase III, randomized, double-blind, placebo-controlled, parallel-group study assessed the efficacy and safety of tanezumab in subjects with cancer pain predominantly due to bone metastasis receiving background opioid therapy.MethodsSubjects were randomized (stratified by (1) tumor aggressiveness and (2) presence/absence of concomitant anticancer treatment) to placebo or tanezumab 20 mg. Treatment was administered by subcutaneous injection every 8 weeks for 24 weeks (3 doses) followed by a 24-week safety follow-up period. The primary outcome was change in daily average pain in t

Mechanisms of bone pain: Progress in research from bench to bedside.

The field of research on pain originating from various bone diseases is expanding rapidly, with new mechanisms and targets asserting both peripheral and central sites of action. The scope of research is broadening from bone biology to neuroscience, neuroendocrinology, and immunology. In particular, the roles of primary sensory neurons and non-neuronal cells in the peripheral tissues as important targets for bone pain treatment are under extensive investigation in both pre-clinical and clinical settings. An understanding of the peripheral mechanisms underlying pain conditions associated with va

Mutant presenilin-1 induces apoptosis and downregulates Akt/PKB.

Most early onset cases of familial Alzheimer's disease (AD) are caused by mutations in presenilin-1 (PS1) and presenilin-2 (PS2). These mutations lead to increased beta-amyloid formation and may induce apoptosis in some model systems. Using primary cultured hippocampal neurons (HNs) and rat pheochromocytoma (PC12) cells transiently transfected with replication-defective recombinant adenoviral vectors expressing wild-type or mutant PS1, we demonstrate that mutant PS1s induce apoptosis, downregulate the survival factor Akt/PKB, and affect several Akt/PKB downstream targets, including glycogen sy

Cancer Neoaxonogenesis: Mechanisms and Factors Involved in the Recruitment of Peripheral Nerves by Cancer Tissue.

Peripheral nerves provide a direct connection between the brain and the tumor microenvironment. This connection allows the nervous system to influence processes associated with the development, progression, and metastasis of different tumor types. Therefore, tumor innervation by peripheral nerve fibers is currently emerging as a characteristic that contributes to multiple hallmarks of cancer. Several experimental studies have shown that cancer progression involves actively inducing the ingrowth of autonomic and sensory nerve fibers into tumor tissue. In this process, known as neoaxonogenesis,

Фитохимические вещества, направляемые на сигнализацию BDNF для лечения неврологических расстройств.

Неврологические расстройства определяются ухудшением или нарушением структуры и функции нервной системы. Эти заболевания, включая множественный склероз, болезнь Альцгеймера, болезнь Паркинсона, болезнь Хантингтона и шизофрению, вызваны сложными патологическими процессами, в том числе эксцитотоксичностью, нейроинфламмацией, окислительным стрессом, генетическими мутациями и скомпрометированным нейротрофическим сигналом. Несмотря на то, что в настоящее время лекарственные препараты устраняют симптомы, их долгосрочная эффективность ограничена из-за неблагоприятных побочных эффектов и слабых нейроз

Cataract Induced by Glucocorticoids.

Glucocorticoids (GCs) remain a cornerstone therapy for noninfectious uveitis and autoimmune disorders; however, chronic administration is strongly associated with sight-threatening complications, particularly glucocorticoid-induced cataracts (GIC). This comprehensive review synthesizes current evidence on the molecular pathogenesis, epidemiological patterns, and clinical management of GIC. Epidemiological analyses indicate that over 50% of patients receiving systemic corticosteroids for >60 days develop ocular complications, with cataract formation (36%) and glaucoma (16%) representing the pre

Effect of recombinant human nerve growth factor treatment on corneal nerve regeneration in patients with neurotrophic keratopathy.

IntroductionNeurotrophic Keratopathy (NK) is a neurodegenerative corneal disease that results in diminished corneal sensation. Previous studies have found that Cenegermin 0.002%, a recombinant human nerve growth factor (rhNGF), improves corneal epithelial healing in stage 2 and 3 NK patients. However, rhNGF effect on corneal sensation and nerve regeneration has not been well established. Thus, this study aims to analyze the effect of rhNGF on corneal nerve regeneration using in vivo confocal microscopy (IVCM) and on corneal sensitivity in NK patients.MethodsThis is a retrospective, longitudina