Interstitial Fluid Dynamics in Tumor Microenvironments

In solid tumours, interstitial fluid dynamics emerge from a complex interplay between leaky tumour vasculature, impaired lymphatic drainage and a dense extracellular matrix. Elevated interstitial fluid pressure (IFP) develops as plasma filters from blood vessels into the interstitium, encountering restricted hydraulic conductivity that hinders bulk flow. The resulting pressure gradients and convective currents modulate drug delivery, nutrient transport and mechanotransduction pathways in resident cells. Fluid shear stress within the matrix can activate cytokine signalling, alter cell–cell and cell–matrix adhesions, and trigger epithelial–mesenchymal transition, thereby promoting invasive phenotypes. Quantitative measurements of IFP and interstitial flow have been enabled by advanced imaging and computational modelling, offering non-invasive biomarkers for therapy response. Understanding these fluid forces is critical for the design of stroma-targeted anticancer strategies, optimisation of drug penetration and the development of engineered microenvironments that recapitulate in vivo biomechanics for preclinical testing.

Research from Nature Portfolio

Recent studies have employed three-dimensional microfluidic tumour spheroids embedded in collagen matrices with defined interstitial flows. These models demonstrate that physiologically relevant flow rates downregulate E-cadherin on non-tumorigenic cells, shifting the force balance between cell–cell and cell–matrix adhesion and thereby enhancing collective invasion of metastatic cells. By integrating real-time imaging with perfusion, this work dissects the mechanobiological regulation of invasion and underscores the importance of biophysical parameters in constructing realistic tumour microenvironments.

Research from all publishers

A hybrid experimental–computational study measured human tumour hydraulic conductivity values on the order of 10⁻¹⁵ to 10⁻¹⁴ m² Pa⁻¹ s⁻¹ and found an inverse relationship with collagen fibre density. Computational fluid dynamics models revealed that higher conductivity reduces IFP and facilitates deeper drug penetration. In a 3D-microfluidic lung cancer spheroid platform, interstitial flow was shown to potentiate exogenous TGF-β-induced Smad signalling and upregulate mesenchymal markers, driving increased spheroid motility. A recent review of breast and brain cancer models highlighted common physical motifs—such as elevated interstitial pressure and directional flow—that guide invasion via structural cues and heterotypic interactions; it also emphasised the value of engineered systems for measuring, modelling and normalising the physical tumour milieu to improve therapeutic outcomes.

Interstitial Fluid Dynamics in Tumor Microenvironments publication trend

The graph below shows the total number of articles in interstitial fluid dynamics in tumor microenvironments across all publications each year (not limited to Nature Index journals).

Technical terms

Interstitial fluid pressure: Pressure exerted by fluid within the tumour interstitium arising from vascular leakage and lymphatic dysfunction.

Hydraulic conductivity: Quantitative measure of the ease with which fluid traverses the interstitial matrix under a pressure gradient.

Extracellular matrix: Three-dimensional network of proteins and polysaccharides surrounding tumour cells that governs tissue mechanics and fluid movement.

Mechanotransduction: Process by which cells convert mechanical stimuli, such as fluid shear stress, into intracellular biochemical signals.

References

1. Hydraulic conductivity of human cancer tissue: A hybrid study. Bioengineering & Translational Medicine (2023).
2. Interstitial flow potentiates TGF-β/Smad-signaling activity in lung cancer spheroids in a 3D-microfluidic chip. Lab on a Chip (2024).
3. Tumor spheroids under perfusion within a 3D microfluidic platform reveal critical roles of cell-cell adhesion in tumor invasion. Scientific Reports (2020).
4. Regulation of Tumor Invasion by the Physical Microenvironment: Lessons from Breast and Brain Cancer. Annual Review of Biomedical Engineering (2022).