Honeybee immune system

The **honeybee immune system** is the collection of immune mechanisms, both cellular and humoral, that protect the honey bee (*Apis mellifera*) from pathogens and parasites. It is an **innate immune system** (lacking adaptive immunity) and consists of physical barriers (such as the exoskeleton and alimentary tract membranes), **cellular components** (including **hemocytes**, **granulocytes**, and **plasmatocytes**), and **humoral components** (such as **antimicrobial peptides**—abaecin, apidaecin, hymenoptaecin, and defensin—complement-like proteins, and cytokines)[1][3][9]. Recognition of pathogens occurs via **pattern recognition receptors (PRRs)**, which detect **pathogen-associated molecular patterns (PAMPs)** and activate signaling pathways including **Toll, Imd, JAK/STAT, and RNA interference (RNAi)**[2][3][4][9]. These pathways coordinate defenses such as phagocytosis, encapsulation, melanization, production of antimicrobial effectors, and RNAi-driven antiviral responses. Honeybees have fewer immune genes than some other insects but retain key conserved effectors. The system is crucial for colony health and highly sensitive to environmental stressors, emerging pathogens, and pesticides. This is not a single molecular target but rather a summary of immune pathways and components, so the entry "Honeybee immune system" is not a molecular target or receptor and cannot be matched to a single canonical target for structured drug development applications[1][3].

Other names

Honey bee immune systemApis mellifera immune systemApian immune system