Authors:

Ethan John

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About Paper:

Actin filament (F-actin) is a prevalent protein found in all organisms, serving as a structural regulator in multiple body systems. This protein plays a crucial role in synaptic plasticity by affecting dendritic morphology. Recent advancements in super-resolution microscopy have revolutionized imaging protocols for these smaller-scale molecules, enabling more precise visualization of biomolecule function. This study investigated F-actin regulation by exploring the function of Drebrin1, the primary regulator of F-actin, and F-actin itself at dendritic sites. The interactions between these two proteins were key to the study as Drebrin1 has unique properties that allow it to effectively bundle F-actin for regulation, while F-actin can affect Drebrin1 concentration and expression in cells as needed. Preliminary experiments were conducted using indirect immunofluorescence staining to verify the function and presence of Drebrin1 near dendrites. Confocal microscopy was employed to observe and analyze Drebrin1 behavior at dendritic sites, revealing a significant colocalization between Drebrin1 and MAP2, a protein that identifies dendrites, with about 92.5% overlap. Subsequent experiments involved the development of DNA point-accumulation-for-imaging-in-nanoscale-topography (PAINT) probes that facilitated more effective fluorophore binding to the target protein. The creation of this superior conjugate was validated through gel electrophoresis showing distinct bands around 12 and 25 kDa, indicating a successful conjugation. Future plans include introducing imager strands to these conjugates under microscopy, enabling imaging to occur at a level closer to super-resolution. These experiments will serve to improve understanding of the mechanisms involved in how F-actin regulation affects the structural homeostatic plasticity of dendrites.

Source:

Purdue University / 2023

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Co-authors:

Ethan John