Dendritiska

Dendritiska is an adjective used in Swedish to describe structures or cells that have dendrites or are dendrite-like. The term is commonly used in two fields: neurobiology and immunology.

In neurobiology, dendrites are the branched extensions of neurons that receive synaptic inputs. The dendritic arbor influences how inputs are integrated and how signals propagate within neurons. Dendritic spines, small protrusions on dendrites, host many excitatory synapses and are key sites for synaptic plasticity. The morphology of dendrites and their spines changes during development, learning, and in response to experience.

In immunology, dendritic cells are antigen-presenting cells that bridge innate and adaptive immunity. They originate from bone marrow precursors and migrate from peripheral tissues to lymphoid organs upon antigen uptake. Immature dendritic cells capture antigens; upon maturation they upregulate MHC class II and costimulatory molecules (CD80, CD86, CD40) and secrete cytokines. They travel to lymph nodes via CCR7, where they present processed antigens to T cells. DCs can activate CD4+ T helper cells via MHC II and, through cross-presentation, CD8+ cytotoxic T cells via MHC I. Subtypes include conventional (myeloid) DCs, plasmacytoid DCs, and tissue-resident Langerhans cells. Dendritic cells also contribute to tolerance under steady-state conditions. Their function is modulated by pattern recognition receptors, cytokines, and the tissue microenvironment. In clinical contexts, dendritic cells are explored in immunotherapies, including cancer vaccines and strategies to enhance anti-tumor immunity.