Plant cell wall polysaccharide (PCWP)

Plant cell wall polysaccharides are a heterogeneous group of complex carbohydrates, primarily including cellulose, hemicelluloses (such as xyloglucan and xylan), and pectins, which constitute the structural framework of plant tissues [1, 14]. In plants, these polymers are synthesized by various glycosyltransferases and organized into dynamic, load-bearing networks that resist turgor pressure and provide a physical barrier against environmental stress and pathogens [2, 12, 13]. While they are not classical therapeutic targets in human biology, they serve as critical therapeutic agents and dietary fiber components that modulate human health through physical and microbial interactions in the gastrointestinal tract [4, 16]. Clinically, they are used to manage metabolic disorders such as type 2 diabetes and obesity by slowing the absorption of macronutrients and promoting satiety [4, 9]. Furthermore, their fermentation by colonic bacteria produces bioactive metabolites like short-chain fatty acids (SCFAs), which exert systemic anti-inflammatory and immunomodulatory effects via host receptors [3, 16]. In industrial and agricultural contexts, these polysaccharides are primary targets for enzymatic degradation by cellulases and hemicellulases for biofuel production and plant pathology interventions [1, 15].

Other names

Dietary fiberCelluloseHemicellulosePectinNon-starch polysaccharidePlant fiberRoughageComplex plant carbohydrate

Plant cell wall polysaccharides exert their therapeutic effects through bulk-forming action in the gastrointestinal tract, which increases stool volume and transit speed [4]. They also physically sequester bile acids and slow the enzymatic digestion of starch, thereby attenuating postprandial glucose and lipid absorption [4, 16]. Additionally, they act as prebiotics that are fermented by anaerobic gut bacteria into short-chain fatty acids (SCFAs) like butyrate, which serve as ligands for G-protein coupled receptors (e.g., GPR41 and GPR43) to regulate host immune signaling and metabolic homeostasis [3, 9, 16].