Submucosal gland of respiratory tract

Submucosal glands of the respiratory tract are specialized secretory glands located beneath the epithelial lining of medium and large airways, including the trachea and bronchi. These glands include both mucous and serous cell types within a tubuloacinar structure, connected to the airway surface via ducts. They produce and secrete large amounts of mucus composed of water, electrolytes, and mucin glycoproteins—primarily MUC5B, along with hundreds of proteins for airway protection[1][3][4][6]. Their main function is to maintain airway hydration, trap inhaled particles, and mediate mucociliary clearance. Dysfunction or hyperplasia of these glands contributes to the pathology of diseases such as cystic fibrosis (due to abnormal mucus viscosity and clearance), asthma, and chronic bronchitis[1][3][4]. Although some drugs (e.g., muscarinic antagonists, mucolytics) modify gland secretion, the "mucous gland" itself is not a single molecular target, but rather an anatomical and functional unit[1][3]. Key caveat: "Mucous gland of respiratory tract" is not the name of a discrete molecular target, enzyme, receptor, or transporter, but rather refers to a tissue structure comprised of multiple cell types and molecular pathways. For queries about molecular regulation or druggable targets within these glands, focus would shift to specific molecular components such as muscarinic receptors (e.g., M3) or mucin proteins (e.g., MUC5B)[2][6], which are genuine drug or research targets.

Other names

Submucosal glandairway submucosal glandbronchial glandairway glandsubmucosal mucous gland