Physiological cell and tissue microenvironment

The physiological cell and tissue microenvironment is the local biological system surrounding a cell, consisting of the extracellular matrix (ECM), neighboring cells (such as fibroblasts and immune cells), blood vessels, and a variety of signaling molecules like cytokines and growth factors (NCI Dictionary of Cancer Terms). It plays a critical role in regulating cellular behavior, including growth, survival, and differentiation, through both biochemical and mechanical signals (Nature Reviews Molecular Cell Biology, 2014). In pathological conditions, such as cancer or fibrosis, the microenvironment undergoes significant remodeling, often creating a niche that promotes disease progression and drug resistance (PubMed, PMID: 29117544). While the microenvironment itself is not a single molecular target, many modern therapies aim to modulate its components—for example, anti-angiogenic agents like Bevacizumab target the vascular supply, while checkpoint inhibitors like Pembrolizumab target the immune milieu (Science, 2018). Understanding the interplay between cells and their surroundings is essential for developing effective treatments that can overcome the protective or stimulatory effects of a diseased microenvironment.

Other names

Cellular microenvironmentTissue microenvironmentExtracellular nicheLocal tissue milieuStroma

Therapeutic strategies involve the modulation of the extracellular matrix (e.g., hyaluronan degradation), inhibition of pro-angiogenic signaling (e.g., VEGF blockade), and the alteration of immune cell infiltration and activation within the tissue niche.