Dihydrochalcones in Sweet Tea: Biosynthesis, Distribution and Neuroprotection Function

Area of Science:

• Phytochemistry
• Neuropharmacology
• Metabolic Engineering

Background:

• Sweet tea, derived from *Lithocarpus litseifolius*, is a traditional herbal beverage from southwest China.
• Its characteristic sweetness is primarily due to a high concentration of dihydrochalcones.
• Dihydrochalcones are known for their potential health benefits, including neuroprotection.

Purpose of the Study:

• To review the distribution and biosynthesis of dihydrochalcones in sweet tea.
• To explore the neuroprotective effects of dihydrochalcones through in vitro and in vivo studies.
• To understand the molecular mechanisms underlying dihydrochalcone-mediated neuroprotection.

Main Methods:

• Literature review on dihydrochalcone distribution, biosynthesis, and neuroprotective properties.
• Analysis of dihydrochalcone composition, focusing on phloretin, trilobatin, and phloridzin.
• Examination of gene expression related to dihydrochalcone metabolic pathways (e.g., phenylalanine ammonia-lyase).

Main Results:

• Dihydrochalcones, primarily phloretin glycosides, are concentrated in tender leaves with geographical specificity.
• Dihydrochalone biosynthesis involves phenylpropanoid and flavonoid pathways, regulated by specific genes.
• In vitro and in vivo studies demonstrate significant neuroprotective effects of dihydrochalones.

Conclusions:

• Dihydrochalones in sweet tea possess significant neuroprotective capabilities.
• These compounds modulate key pathological pathways in neurodegenerative diseases, including Aβ deposition, tau hyperphosphorylation, oxidative stress, inflammation, and apoptosis.
• Sweet tea represents a potential natural source for compounds with therapeutic value for neurological disorders.