Gut–Brain Axis Regulation by Bamboo-Derived Polysaccharides: Neuroprotective and Metabolic Implications of Phyllostachys nigra

Abstract

The bidirectional communication network linking the gastrointestinal tract and the central nervous system, commonly termed the gut–brain axis, constitutes a deeply integrated, multi-scale infrastructure whose dysfunction underlies a rising global burden of metabolic and neurodegenerative conditions. Within this complex system, dietary polysaccharides have emerged as potent modulators capable of recalibrating host-microbiome signaling, yet a comprehensive systems-level understanding of specific natural polysaccharide sources remains fragmentary. This paper develops a systems-oriented analysis of polysaccharides derived from Phyllostachys nigra, a black bamboo species with a long ethnopharmacological history, examining their capacity to orchestrate neuroprotective and metabolic regulation through the gut–brain axis. We conceptualize the axis as a distributed, multi-agent adaptive system characterized by structural feedback loops, path-dependent developmental trajectories, and vulnerability to cascading failure. Bamboo-derived heteropolysaccharides are interpreted not merely as biochemical inputs but as systemic interventions that reconfigure the informational architecture of the microbiome-gut-brain superorganism. Through a detailed review of molecular and ecological evidence, we elucidate how their unique monosaccharide composition, glycosidic linkages, and supramolecular assemblies translate into emergent properties such as selective prebiotic fermentation, short-chain fatty acid redirection, immunomodulatory tone resetting, and preservation of blood-brain barrier integrity. Special attention is devoted to the cascading metabolic impact on glycolipid homeostasis, insulin sensitivity, and low-grade chronic inflammation, which together form a self-reinforcing network underlying metabolic syndrome and neurodegeneration. The discussion is extended to the translational landscape, critically evaluating the challenges of scalability, standardization, and equitable deployment of polysaccharide-based interventions in heterogeneous populations. We analyze governance frameworks for functional foods and nutraceuticals, highlighting tensions between intellectual property regimes, open-source botanical knowledge, and the imperative of biocultural fairness. Sustainability of bamboo feedstock is assessed from a planetary systems perspective, weighing carbon sequestration, biodiversity impacts, and agricultural land-use trade-offs. By integrating molecular systems biology with socio-technical infrastructure thinking, this paper provides a novel architectural perspective on gut–brain axis modulation and positions Phyllostachys nigra polysaccharides as a paradigm for developing robust, ecologically embedded neuroprotective strategies.