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Showing posts from June, 2024

Intracranial EEG Reveals the Hidden Neural Architecture of Human Empathy: A New Perspective on Brain Network Dynamics

Dr. Rishabh Pathak
  Research Paper: Intracranial EEG Signals Disentangle Multi-Areal Neural Dynamics of Vicarious Pain Perception Authors: Huixin Tan, Xiaoyu Zeng, Jun Ni, Kun Liang, and colleagues Published: 2024 Journal: Nature Communications, Volume 15, Article 5203 DOI: https://doi.org/10.1038/s41467-024-49541-1 Introduction: How Does the Brain Experience Someone Else's Pain? Have you ever wondered why watching another person experience pain can generate an emotional response within your own brain? Why do we sometimes feel discomfort, sadness, or even pain when witnessing someone else's suffering? This phenomenon is known as empathy for pain , or vicarious pain perception. Empathy is one of the most sophisticated functions of the human nervous system. It involves the integration of sensory information, emotional processing, cognitive interpretation, and motivational responses. Although previous neuroimaging studies identified several brain regions associated with empathy, unders...
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The Role of Polysialylation in Brain Development

Dr. Rishabh Pathak
Polysialylation, the addition of polysialic acid chains to glycoproteins like the Neural Cell Adhesion Molecule (NCAM), plays a crucial role in brain development. Here are key points outlining the significance of polysialylation in brain development: 1.       Neuronal Migration : o Polysialylation of NCAM is essential for neuronal migration during brain development. o Polysialic acid chains on NCAM reduce cell adhesion, allowing migrating neurons to detach from neighboring cells and move to their appropriate locations in the developing brain. 2.      Axon Guidance : o Polysialylation of NCAM is involved in axon guidance, the process by which growing axons navigate to their target regions to establish neural circuits. o Polysialic acid on NCAM modulates axon growth cone behavior, facilitating the extension of axons and their pathfinding to specific target areas. 3.      Synaptic Plasticity : o Polysialylation of NCAM contri...
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The Polysialylation Of NCAM

Dr. Rishabh Pathak
Polysialylation of NCAM refers to the post-translational modification of the Neural Cell Adhesion Molecule (NCAM) with polysialic acid chains. Here is an overview of polysialylation of NCAM: 1.       Polysialic Acid (PSA) : o    Polysialic acid is a linear homopolymer of α-2,8-linked sialic acid residues. o     PSA is a large, negatively charged carbohydrate polymer that can be attached to glycoproteins, with NCAM being one of the major carriers of polysialic acid in the nervous system. 2.      Function of Polysialylation : o     Regulation of Cell Adhesion : Polysialylation of NCAM reduces its adhesive properties, leading to decreased cell-cell adhesion and increased cell motility. o   Neuronal Plasticity : Polysialylation of NCAM is involved in modulating neuronal plasticity, axon guidance, and synaptic remodeling during development and in response to environmental cues. o     Neur...
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Presentation Of the Structure Of NCAM

Dr. Rishabh Pathak
The Neural Cell Adhesion Molecule (NCAM) is a glycoprotein that plays a crucial role in cell-cell adhesion, neurite outgrowth, and synaptic plasticity in the nervous system. Here is a brief overview of the structure of NCAM: 1.       General Structure : o   NCAM is a transmembrane protein that belongs to the immunoglobulin superfamily. o     It consists of five immunoglobulin-like domains (Ig domains) in the extracellular region, followed by two fibronectin type III repeats and a transmembrane domain. o   The cytoplasmic domain of NCAM interacts with intracellular signaling molecules to mediate cellular responses. 2.      Ig-Like Domains : o     The extracellular region of NCAM contains five Ig-like domains (Ig1 to Ig5) that are involved in cell adhesion and recognition. o   These Ig domains mediate homophilic interactions between NCAM molecules on adjacent cells, promoting cell adhesion and signal...
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Role of NCAM in Health and Disease

Dr. Rishabh Pathak
The Neural Cell Adhesion Molecule (NCAM) plays a crucial role in various physiological and pathological processes in the nervous system. Here are some key points regarding the role of NCAM in health and disease: 1.       Cell Adhesion and Neural Development : o Cell-Cell Interactions : NCAM is involved in mediating cell-cell adhesion and interactions between neurons, glial cells, and other cell types in the nervous system, contributing to neural development, synaptogenesis, and neural circuit formation. o Neurite Outgrowth : NCAM promotes neurite outgrowth, axon guidance, and neuronal migration during brain development, facilitating the establishment of neural connections and the wiring of the nervous system. 2.      Plasticity and Learning : o Synaptic Plasticity : NCAM is implicated in synaptic plasticity, including long-term potentiation (LTP) and long-term depression (LTD), which are cellular mechanisms underlying learning and memory proc...
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Mapping Lineage in The Developing Nervous System with Brainbow Multicolour Transgenes

Dr. Rishabh Pathak
Mapping lineage in the developing nervous system with Brainbow multicolour transgenes involves a powerful genetic tool that enables the visualization and tracking of individual cells and their progeny with distinct fluorescent colors. Here are some key points related to mapping lineage in the developing nervous system using Brainbow multicolour transgenes: 1.       Principle of Brainbow Technology : o    Genetic Mosaicism : Brainbow transgenes utilize combinatorial expression of fluorescent proteins to create a diverse color palette within individual cells, resulting in a unique color identity for each cell and its descendants. o     Random Recombination : By incorporating multiple fluorescent protein variants and employing stochastic Cre-lox recombination events, Brainbow transgenes generate a spectrum of colors that can be used to label and trace cell lineages in a spatially and temporally controlled manner. 2.     ...
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