scholarly journals Neuron–Glia Interactions in Tuberous Sclerosis Complex Affect the Synaptic Balance in 2D and Organoid Cultures

Cells ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 134
Author(s):  
Stephanie Dooves ◽  
Arianne J. H. van Velthoven ◽  
Linda G. Suciati ◽  
Vivi M. Heine
Keyword(s):  
Tuberous Sclerosis ◽  
Glial Cells ◽  
Tuberous Sclerosis Complex ◽  
Neuronal Development ◽  
Transmembrane Proteins ◽  
Significant Burden ◽  
Epidermal Growth ◽  
And Control ◽  
Egf Signaling ◽  
The Brain

Tuberous sclerosis complex (TSC) is a genetic disease affecting the brain. Neurological symptoms like epilepsy and neurodevelopmental issues cause a significant burden on patients. Both neurons and glial cells are affected by TSC mutations. Previous studies have shown changes in the excitation/inhibition balance (E/I balance) in TSC. Astrocytes are known to be important for neuronal development, and astrocytic dysfunction can cause changes in the E/I balance. We hypothesized that astrocytes affect the synaptic balance in TSC. TSC patient-derived stem cells were differentiated into astrocytes, which showed increased proliferation compared to control astrocytes. RNA sequencing revealed changes in gene expression, which were related to epidermal growth factor (EGF) signaling and enriched for genes that coded for secreted or transmembrane proteins. Control neurons were cultured in astrocyte-conditioned medium (ACM) of TSC and control astrocytes. After culture in TSC ACM, neurons showed an altered synaptic balance, with an increase in the percentage of VGAT+ synapses. These findings were confirmed in organoids, presenting a spontaneous 3D organization of neurons and glial cells. To conclude, this study shows that TSC astrocytes are affected and secrete factors that alter the synaptic balance. As an altered E/I balance may underlie many of the neurological TSC symptoms, astrocytes may provide new therapeutic targets.

scholarly journals A novel TSC1 variant associated with tuberous sclerosis and sacrococcygeal teratoma

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Saba Ahmad ◽  
Luis Manon ◽  
Gifty Bhat ◽  
Jerry Machado ◽  
Alice Zalan ◽  
...  
Keyword(s):  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Cellular Differentiation ◽  
Autosomal Dominant ◽  
De Novo ◽  
Autosomal Dominant Disease ◽  
Sacrococcygeal Teratoma ◽  
Dominant Disease ◽  
The Brain

AbstractTuberous sclerosis complex (TSC) is an autosomal dominant disease associated with tumors and malformed tissues in the brain and other vital organs. We report a novel de novo frameshift variant of the TSC1 gene (c.434dup;p. Ser146Valfs*8) in a child with TSC who initially presented with a sacral teratoma. This previously unreported association between TSC and teratoma has broad implications for the pathophysiology of embryonic tumors and mechanisms underlying cellular differentiation.

scholarly journals Early white matter development is abnormal in tuberous sclerosis complex patients who develop autism spectrum disorder

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Anna K. Prohl ◽  
◽  
Benoit Scherrer ◽  
Xavier Tomas-Fernandez ◽  
Peter E. Davis ◽  
...  
Keyword(s):  
Autism Spectrum Disorder ◽  
White Matter ◽  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Neural Circuits ◽  
Diffusion Tensor ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Fiber Bundles ◽  
The Brain

Abstract Background Autism spectrum disorder (ASD) is prevalent in tuberous sclerosis complex (TSC), occurring in approximately 50% of patients, and is hypothesized to be caused by disruption of neural circuits early in life. Tubers, or benign hamartomas distributed stochastically throughout the brain, are the most conspicuous of TSC neuropathology, but have not been consistently associated with ASD. Widespread neuropathology of the white matter, including deficits in myelination, neuronal migration, and axon formation, exist and may underlie ASD in TSC. We sought to identify the neural circuits associated with ASD in TSC by identifying white matter microstructural deficits in a prospectively recruited, longitudinally studied cohort of TSC infants. Methods TSC infants were recruited within their first year of life and longitudinally imaged at time of recruitment, 12 months of age, and at 24 months of age. Autism was diagnosed at 24 months of age with the ADOS-2. There were 108 subjects (62 TSC-ASD, 55% male; 46 TSC+ASD, 52% male) with at least one MRI and a 24-month ADOS, for a total of 187 MRI scans analyzed (109 TSC-ASD; 78 TSC+ASD). Diffusion tensor imaging properties of multiple white matter fiber bundles were sampled using a region of interest approach. Linear mixed effects modeling was performed to test the hypothesis that infants who develop ASD exhibit poor white matter microstructural integrity over the first 2 years of life compared to those who do not develop ASD. Results Subjects with TSC and ASD exhibited reduced fractional anisotropy in 9 of 17 white matter regions, sampled from the arcuate fasciculus, cingulum, corpus callosum, anterior limbs of the internal capsule, and the sagittal stratum, over the first 2 years of life compared to TSC subjects without ASD. Mean diffusivity trajectories did not differ between groups. Conclusions Underconnectivity across multiple white matter fiber bundles develops over the first 2 years of life in subjects with TSC and ASD. Future studies examining brain-behavior relationships are needed to determine how variation in the brain structure is associated with ASD symptoms.

Tuberous Sclerosis Complex

2017 ◽  
Author(s):  
Tanjala T. Gipson ◽  
Andrea Poretti ◽  
Rebecca McClellan ◽  
Michael V. Johnston
Keyword(s):  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Scientific Discovery ◽  
Skin Lesions ◽  
Benign Tumors ◽  
Behavioral Difficulties ◽  
Future Directions ◽  
Neurocutaneous Disorder ◽  
The Status ◽  
The Brain

Tuberous sclerosis complex (TSC) is a disease, commonly classified as a neurocutaneous disorder, which may result in benign tumors throughout the brain and body, skin lesions, epilepsy, and cognitive/behavioral difficulties. Scientific discovery in TSC has resulted in the availability of treatments designed to target the neurobiological core of TSC in children. However, research is needed to determine if these treatments are effective for multiple aspects of the TSC phenotype in children. Current pediatric research studies have focused on the effects of early treatment of epilepsy as well as identification of potential biomarkers. This chapter reviews the aspects of TSC unique to pediatric patients, the status of current research, and future directions.

scholarly journals Retracted Tuberous sclerosis complex: molecular pathogenesis and animal models

2006 ◽  
Vol 20 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Leandro R. Piedimonte ◽  
Ian K. Wailes ◽  
Howard L. Weiner
Keyword(s):  
Animal Models ◽  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Conditional Knockout ◽  
Signaling Complex ◽  
Normal Functions ◽  
Similar Disease ◽  
The Central Nervous System ◽  
Cortical Tubers ◽  
The Brain

Mutations in one of two genes, TSC1 and TSC2, result in a similar disease phenotype by disrupting the normal interaction of their protein products, hamartin and tuberin, which form a functional signaling complex. Disruption of these genes in the brain results in abnormal cellular differentiation, migration, and proliferation, giving rise to the characteristic brain lesions of tuberous sclerosis complex (TSC) called cortical tubers. The most devastating complications of TSC affect the central nervous system and include epilepsy, mental retardation, autism, and glial tumors. Relevant animal models, including conventional and conditional knockout mice, are valuable tools for studying the normal functions of tuberin and hamartin and the way in which disruption of their expression gives rise to the variety of clinical features that characterize TSC. In the future, these animals will be invaluable preclinical models for the development of highly specific and efficacious treatments for children affected with TSC.

Magnetization transfer ratio measurements of the brain in children with tuberous sclerosis complex

2005 ◽  
Vol 35 (11) ◽  
pp. 1071-1074 ◽  
Author(s):  
Anastasia Zikou ◽  
Maria-Christina Ioannidou ◽  
Meropi Tzoufi ◽  
Loukas Astrakas ◽  
Maria I. Argyropoulou
Keyword(s):  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Magnetization Transfer ◽  
Magnetization Transfer Ratio ◽  
Transfer Ratio ◽  
The Brain

scholarly journals Magnetization transfer ratio measurements of the brain in children with tuberous sclerosis complex

2005 ◽  
Vol 35 (12) ◽  
pp. 1294-1294
Author(s):  
Anastasia Zikou ◽  
Maria-Christina Ioannidou ◽  
Meropi Tzoufi ◽  
Loukas Astrakas ◽  
Maria I. Argyropoulou
Keyword(s):  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Magnetization Transfer ◽  
Magnetization Transfer Ratio ◽  
Transfer Ratio ◽  
The Brain

scholarly journals Tale of a Teenager: A Case Report of Tuberous Sclerosis

2021 ◽  
Vol 33 (1) ◽  
pp. 99-103
Author(s):  
Nawsabah Noor ◽  
Iffat Ara Jurfa ◽  
Halima Khatun ◽  
Homayra Tahseen ◽  
Quazi Tarikul Islam
Keyword(s):  
Case Report ◽  
Tuberous Sclerosis ◽  
Clinical Features ◽  
Tuberous Sclerosis Complex ◽  
Autosomal Dominant ◽  
Skin Lesions ◽  
Benign Tumors ◽  
Dominant Inheritance ◽  
Neurocutaneous Syndrome ◽  
The Brain

Tuberous sclerosis complex is an unusual neurocutaneous syndrome with autosomal-dominant inheritance. It is characterized by the development of benign tumors involving the brain, skin, retina, heart, kidneys, lungs, and liver. The classic triad of clinical features comprises learning disability, epilepsy and skin lesions but there is marked heterogeneity in clinical features. Here, we present a case report of a 17-old-year male with characteristic clinical and radiological features of tuberous sclerosis complex. Bangladesh J Medicine July 2022; 33(1) : 99-103

scholarly journals Case Report on: Tuberous Sclerosis

2021 ◽  
pp. 140-147
Author(s):  
Ruchira Ankar ◽  
Archana Dhengare ◽  
Arti Raut ◽  
Seema Singh ◽  
Samruddhi Gujar
Keyword(s):  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Genetic Disorder ◽  
Hereditary Disease ◽  
Chief Complaint ◽  
Benign Tumors ◽  
Surrounding Area ◽  
Benign Tumours ◽  
Intellectual Incapacity ◽  
The Brain

Introduction: Tuberous sclerosis is a rare hereditary disease that creates noncancerous tumours in the brain, kidneys, heart, liver, eyes, lungs, and skin. Seizures, intellectual incapacity, developmental delays, and behavioral issues are just a few of the warning symptoms. Like Skin problems, and lung and kidney problems. A hereditary mutation in one of two genes causes TSC.TSC1 and TSC2 are two distinct TSC types. The proteins hemartin and tuberin, which act as tumour suppressors and govern cell proliferation and differentiation, are produced by these genes. [1]. Background: Tuberous sclerosis complex (TSC) is a rare genetic disorder that affects 1 in every 6,000 to 1 in every 18,000 people. It's a life-threatening condition caused by the formation of benign tumors/lesions in several organs. Tumors can affect organ growth and/or function and are frequent in the brain, heart, skin, kidneys, and lungs. The number of organs affected, as well as the size of tumours inside each organ, varies greatly. As a result, the disease's symptoms are extremely variable and unexpected [2]. Case Presentation: A 35-year old female admitted to AVBRH on date 25/11/2021 with the chief complaint of fever chills, nausea, vomiting and itching and back skin over mouth and eye surrounding area since in 10 days.   History of Present Illness: Tuberous sclerosis, also known as tuberous sclerosis complex, is a rare genetic disease that causes non-cancerous (benign) tumours in the brain, skin, kidneys, heart, eyes, and lungs. A 35-yearold female admitted to hospital on date 25/11/2020 with the chief complaint was fever chills, nausea, vomiting and itching and back skin over mouth and eye surrounding area since in 4month. Interventions: The patient was treated the patient was started on Injection- Ceftriaxone, 1gm - Intravenous – BD- Antibiotic, Injection- Pan, 40mg – Intravenous- BD – Antacid, Injection- Livipril, 100mg – Intravenous- BD- Anticonvulsant, Injection- Paracetamol, 150mg – Intra muscular- SOS- Antipyretic. Conclusion: During hospital stay with the chief complaint of patient are fever chills, nausea, vomiting and itching and back skin over mouth and eye surrounding area since in 10 days. Her situation was critical, therefore she was brought to AVBR Hospital and treatment was started right away.

Forehead plaque in a child with epilepsy: A clue for tuberous sclerosis

2020 ◽  
pp. 004947552097252
Author(s):  
Bhanudeep Singanamalla ◽  
Chandana Bhagwat ◽  
Priyanka Madaan ◽  
Lokesh Saini ◽  
Dipankar De
Keyword(s):  
Tuberous Sclerosis ◽  
Tuberous Sclerosis Complex ◽  
Café Au Lait Spots ◽  
Neurocutaneous Disorder ◽  
Clonic Seizures ◽  
The Brain ◽  
Made In

Tuberous sclerosis complex is a common neurocutaneous disorder that predominantly affects the brain, skin, eyes, heart and kidneys. The management of tuberous sclerosis complex has been revolutionised with vigabatrin for spasms and everolimus for angiomyolipomas and seizures. We describe a 10-year-old girl with generalised tonic-clonic seizures whose diagnosis of tuberous sclerosis complex was made in view of the presence of a forehead plaque. Certain clinical pointers such as ashleaf macules, café-au-lait spots, shagreen patches and forehead plaques must therefore be looked for in a child with unprovoked seizures.

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