Heterogeneities Shape Passive Intracellular Transport

TL;DR

This study investigates how heterogeneities within the cytoplasm influence passive intracellular transport, revealing that cytoplasmic heterogeneities cause non-Gaussian displacement distributions, independent of cytoskeleton conditions.

Contribution

The paper introduces a novel model linking cytoplasmic heterogeneities to non-Gaussian transport, advancing understanding of passive intracellular dynamics.

Findings

Cytoplasmic heterogeneities cause non-Gaussian displacement distributions.

Non-Gaussian features are independent of cytoskeleton conditions.

Anomalous scaling of mean-squared displacement is regulated by cytoskeleton.

Abstract

A living cell's interior is one of the most complex and intrinsically dynamic systems, providing an elaborate interplay between cytosolic crowding and ATP-driven motion, which controls cellular functionality. Here, we investigated two distinct fundamental features of the merely passive, not-bio-motor shuttled material transport within the cytoplasm of Dictyostelium discoideum cells: the anomalous non-linear scaling of the mean-squared displacement of a 150nm-diameter particle and non-Gaussian distribution of increments. Relying on single-particle tracking data of 320,000 data points, we performed a systematic analysis of four possible origins for non-Gaussian transport: (1) sample-based variability, (2) rare occurring strong motion events, (3) ergodicity breaking/ageing, and (4) spatio-temporal heterogeneities of the intracellular medium. After excluding the first three reasons, we investigated the remaining hypothesis of a heterogeneous cytoplasm as cause for non-Gaussian transport. A novel fit model with randomly distributed diffusivities implementing medium heterogeneities suits the experimental data. Strikingly, the non-Gaussian feature is independent of the cytoskeleton condition and lag time. This reveals that efficiency and consistency of passive intracellular transport and the related anomalous scaling of the mean-squared displacement are regulated by cytoskeleton components, while cytoplasmic heterogeneities are responsible for the generic, non-Gaussian distribution of increments.