Salmonella tumor colonization

Salmonella tumor colonization" refers to the phenomenon where live *Salmonella* bacteria preferentially accumulate, survive, and/or proliferate in solid tumors due to unique aspects of the tumor microenvironment such as hypoxia, necrosis, availability of certain nutrients, and depressed local immune surveillance. Engineered and attenuated strains of *Salmonella enterica* serovar Typhimurium are being explored as experimental cancer therapeutics because they selectively target tumors, induce tumor cell death via direct cytotoxic effects and immune activation, and can be further modified for delivery of anti-cancer agents. This process involves both active and passive mechanisms, including bacterial chemotaxis toward tumor-specific metabolites (e.g., aspartate, serine, ethanolamine), preferential growth in hypoxic and necrotic tumor zones, and evasion of systemic immune responses. Key genes in *Salmonella* involved include those for motility and chemotaxis (e.g., cheY, motAB), as well as metabolic adaptation[1][2][3][4]. There is ongoing debate whether tumor colonization is strictly active (chemotaxis, motility) or can occur passively via host- or bacteria-driven processes[1][3][4].

Other names

tumor-targeting SalmonellaSalmonella-based tumor colonizationtumor-homing Salmonella

Direct induction of tumor cell apoptosis and necrosis through bacterial invasion or proximity; Stimulation of anti-tumor immune responses (including TNF-α mediated mechanisms); Selective accumulation via tumor-specific microenvironment cues (e.g., hypoxia, necrosis, chemotaxis); Anti-angiogenesis (by disrupting vasculature and inducing hemorrhage through inflammatory cytokines).