General immune and tissue microenvironment

The general immune and tissue microenvironment is a complex, dynamic system comprising various cell types, including immune cells (T cells, B cells, NK cells, myeloid cells), stromal cells (fibroblasts, pericytes), and endothelial cells, alongside non-cellular components like the extracellular matrix (ECM) and soluble factors (NCI, 2023). This environment plays a critical role in maintaining tissue homeostasis and regulating the immune response to pathogens and transformed cells (Binnewies et al., 2018). In diseases such as cancer, the microenvironment is often remodeled into a pro-tumorigenic and immunosuppressive state, characterized by hypoxia, nutrient deprivation, and the recruitment of regulatory T cells and myeloid-derived suppressor cells (Anderson and Simon, 2020). Therapeutic strategies targeting this environment do not usually hit a single target but rather modulate specific pathways within it, such as immune checkpoints (e.g., PD-1/PD-L1) or angiogenic signaling (e.g., VEGF), to restore anti-tumor immunity or normalize the vasculature (Nature Reviews Drug Discovery, 2021). Understanding the heterogeneity of these microenvironments is essential for the development of personalized medicine and the identification of biomarkers for treatment response (PubMed, 2022).

Other names

Tumor microenvironmentImmune microenvironmentTissue microenvironmentTMEStroma

Therapeutic strategies involve modulating the cellular composition, signaling pathways, and physical structure of the microenvironment to enhance immune surveillance or inhibit disease progression.