Quantifying Spatiotemporal Parameters of Cellular Exocytosis in Micropatterned Cells

Hugo Lachuer; Pallavi Mathur; Kevin Bleakley; Kristine Schauer

doi:10.3791/60801

Quantificazione dei parametri Spatiotemporal dell'esocitosi cellulare nelle cellule micromodellate

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Quantifying Spatiotemporal Parameters of Cellular Exocytosis in Micropatterned Cells

Quantificazione dei parametri Spatiotemporal dell'esocitosi cellulare nelle cellule micromodellate

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10:21 min

September 16, 2020

DOI: 10.3791/60801-v

Hugo Lachuer^1,2,3, Pallavi Mathur^1,2,3, Kevin Bleakley⁴, Kristine Schauer^1,2,3

¹Unité Mixte de Recherche 144 CNRS, Molecular Mechanisms of Intracellular Transport group,Institut Curie, 75005 Paris, France, ²PSL Research University, Paris, France, ³Sorbonne Université, Paris, France, ⁴INRIA, Université Paris-Sud, PSL

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Overview

This study investigates lysosomal exocytosis in retinal pigment epithelial cells using TOF microscopy on micropatterned surfaces. The approach allows for spatial quantification of secretion events, thereby enhancing our understanding of macromolecule release in immune regulation and cancer.

Key Study Components

Research Area

Cell Biology
Cancer Biology
Microscopy Techniques

Background

Lysosomal exocytosis plays a critical role in secretory functions.
Deregulated secretion may affect cancer progression.
A micropatterning approach normalizes cell morphology for improved analysis.

Methods Used

Live imaging by TOF microscopy
Retinal pigment epithelial cells
Microfabrication of coverslips for micropatterning

Main Results

Spatial quantification of exocytosis events was achieved.
Normalizing cell division enhanced the accuracy of secretory event detection.
Data analysis allowed for detailed tracking of exocytosis spatial distribution.

Conclusions

This study provides insights into the spatial dynamics of lysosomal secretion.
The findings are relevant for understanding cellular processes in cancer and immune responses.

Frequently Asked Questions

What is lysosomal exocytosis?

Lysosomal exocytosis is the process by which lysosomes release their contents into the extracellular space, which is crucial for various cellular functions and responses.

How does micropatterning help in this study?

Micropatterning helps standardize cell morphology, allowing more consistent and spatially resolved measurements of secretion events.

What role do retinal pigment epithelial cells play?

These cells are important for visual function and serve as a model system for studying lysosomal exocytosis and its implications in diseases like cancer.

What technologies are utilized in this study?

The study employs TOF microscopy for live imaging and advanced spatial statistical tools for data analysis.

Why is the quantification of secretion important?

Quantification enables better understanding of cellular dynamics in health and disease contexts, particularly in cancer research.

What are the applications of this research?

The outcomes can inform therapeutic strategies for cancer by elucidating deregulated secretion pathways.

How does this study contribute to the field of cell biology?

It provides a novel method for analyzing cellular secretion processes, enhancing our understanding of fundamental biological functions.

L'imaging vivo dell'esocitosi lisosomica sulle cellule micromodelle consente una quantificazione spaziale di questo processo. La normalizzazione della morfologia tramite micromodelli è uno strumento eccezionale per scoprire le regole generali sulla distribuzione spaziale dei processi cellulari.

Questo protocollo illustra come analizzare la secrezione di cellule utilizzando l'imaging dal vivo mediante microscopia TOF e fornisce strumenti per rilevare eventi di clustering o aree ad alta attività. Utilizzando questo protocollo, possiamo generare colture cellulari su superfici micropattern che normalizzano la divisione cellulare e quindi facilitano le gamme speciali di eventi secretori. Le cellule secernono una varietà di macromolecole che svolgono ruoli importanti nella regolazione immunitaria.

Nel cancro, la secrezione deregolamentata influisce sul rilascio di enzimi proteolitici che facilitano l'invasione. La quantificazione della secrezione ci permetterà di comprendere meglio la secrezione degradata nel cancro e in altri processi dinamici come la presentazione dell'antigene. Sebbene il nostro protocollo di imaging e analisi sia semplice, richiede la generazione di singole cellule che sono ben distribuite su un pezzo di micropattern.

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