Research Focus of the Lab
Research Overview
As we navigate our day-to-day lives full of diverse and dynamic interactions with our environment, our brains show a remarkable capacity to change and adapt that enables us to be the best possible ‘fit’ on every occasion. This is what is known as ‘neural plasticity’ that keeps individual behavior in sync with their external environment. Underlying such malleability of the brain are subtle changes in tiny molecules deep inside the brain that ultimately translate into macroscopic changes that manifest as our behavior, such as learning new skills.
The goal of our research is to understand such molecular mechanisms underlying behavioral modifications in response to experiences. We particularly look at the molecular changes occurring at synapses, the specialized contact sites between neurons that form the core of the neural circuits. Our research focuses on the synapses that use glutamate as neurotransmitter that mediates excitatory synaptic transmission in the mammalian central nervous system, including forebrain and hippocampus. An in-depth molecular understanding of synapse function and plasticity is key to understanding the maintenance of healthy states as well as the emergence of disease states.
Synapse dysfunction is an early event that precedes the onset of clinical symptoms in neurological disorders such as Alzheimer’s disease, Parkinson’s disease, epilepsy and can be targeted to prevent or rescue behavioral deficits in such conditions. But effective therapies for slowing down or stopping synapse loss are lacking. Our understanding of the mechanisms of synapse function and modulation will lay the groundwork for the future development of novel therapeutic approaches. We combine biochemical, cell biological, molecular and physiological approaches to pursue our goals.
Molecular mechanisms of synapse function

Synapses along dendrites of cultured neurons are visualized with labeling for Synapsin (blue) and PSD-95 (red). 3D rendering of dendritic spines (red) along dendrite (green).
Through our lifespan, synapses form, disappear and change in shape/function, thereby playing a pivotal role in forming and maintaining neural circuits, underlying brain functions such as learning, memory and emotions. Aberrations in synaptic proteins is highly associated with psychiatric and neurological disorders, now considered as “synaptopathies”, and these proteins are promising targets for therapeutics development. Recent breakthroughs in spatial proteomic approaches have begun to decode the complex molecular landscape of synapses yielding a huge diversity of synaptic molecules.
This poses a formidable challenge to understand how these molecules orchestrate neuronal connectivity and functioning in response to synaptic activity and how activity, in turn, regulates them. Our lab is interested in identifying the key molecules and their interactions that control synapse function and plasticity as well as vulnerability to damage. We study the excitatory synapses of the mammalian nervous system that use glutamate as the neurotransmitter with a focus on the postsynaptic receptors (AMPARs and NMDARs) and their dynamic regulation. Currently we are looking into the role of liquid-liquid phase separation in shaping post-synaptic signaling complexes. We are also studying the synaptic mechanisms involved in glutamate excitotoxicity.
Palmitoylation of synaptic proteins in health and disease

Loss of PSD-95 palmitoylation upon chronic elevation of network activity in cultured neurons treated with GABA-R antagonist, bicuculline.
Post-translational modifications (PTMs) of synaptic proteins dynamically expand the molecular diversity of synapses and tune synapses for plasticity through signaling complexes. Over the last decade, palmitoylation has emerged as a key PTM of neuronal proteins, including ~40% of synaptic proteins, and has been associated with several neurological disorders, including epilepsy, depression, schizophrenia, addiction, Alzheimer’s Disease, Huntington’s Disease, Parkinson’s Disease and intellectual disability. It involves the attachment of fatty acid, palmitate, to proteins promoting their insertion into lipid membranes and its reversible nature allows proteins to shuttle between subcellular compartments in response to neuronal activity and thereby controls formation of local signaling complexes. Our goal is to understand how palmitoylation/depalmitoylation of key synaptic proteins is regulated during synaptic plasticity and pathological conditions. Currently we are looking into the role of PSD-95 palmitate cycling in neuronal hyperexcitability. Very little is known about how the enzymatic regulation of PSD-95 palmitoylation is tuned to synaptic activity. We are focusing on the deacylase ABHD17 to understand such activity-sensitive regulation of PSD-95 at greater depths.
Synaptic mechanisms of action of natural products with therapeutic potential
![[Image from Biodiversity Heritage Library, Missouri Botanical Garden] Plants have been used in traditional medicine to treat mental health conditions with unknown mechanisms of action.](https://i0.wp.com/chowdhuryneuro.org/wp-content/uploads/2025/02/PlantMedicineBrain.jpg?resize=800%2C312&ssl=1)
Plants have been used in traditional medicine to treat mental health conditions with unknown mechanisms of action.
Observational human studies and traditional knowledge systems inform us about natural compounds with beneficial effects on mental health. However, limited information is available about their mechanisms of action which limits their clinical use. Yet, some of the most potent compounds used in neuroscience research as well as drug development originated in the natural world. Recently, nature-derived psychoactive substances have been shown to augment neuroplasticity, and many are being evaluated clinically to combat treatment-resistant mental health conditions. Our research aims to use cellular models to identify phytochemicals with specific roles in synapse development, maturation and plasticity so as to understand the neurobiological mechanisms involved. Elucidating the underlying mechanisms of their effects will be crucial for potential clinical development.