Biosynthesis and Bioactivity of Fritillaria Alkaloids

Alkaloids derived from Fritillaria species constitute a distinctive class of steroidal alkaloids characterised by a multi-ring sterane scaffold bearing one or more nitrogen substituents. These compounds have underpinned traditional remedies for cough, asthma and phlegm elimination across East Asia and are now the focus of molecular studies that elucidate their biosynthetic pathways and pharmacological properties. Biosynthesis initiates from the mevalonate (MVA) and methylerythritol phosphate (MEP) pathways, which generate isopentenyl diphosphate units. Sequential condensation and cyclisation steps, catalysed by enzymes such as 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) and cycloartenol synthase (CAS1), form the sterol backbone. Functional modification by cytochrome P450 monooxygenases (e.g. CYP90A1, CYP71A26) and glycosyltransferases yields characteristic Fritillaria alkaloids including peimine, peiminine, hupehenine and jervine. Transcription factors of the WRKY, AP2/ERF and NAC families orchestrate tissue-specific expression of these biosynthetic genes. Accumulation of individual alkaloids varies with bulb development, reaching peaks during specific withering stages. Bioactivity studies have demonstrated antitussive effects mediated through anti-muscarinic pathways, expectorant activity via modulation of mucin secretion, anti-inflammatory actions through inhibition of pro-inflammatory cytokines, and anticancer potential achieved by induction of apoptosis and inhibition of angiogenesis. Contemporary research seeks to integrate omics approaches to optimise alkaloid yield, understand regulatory networks and validate therapeutic applications in respiratory and oncological contexts.

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Biosynthesis and Bioactivity of Fritillaria Alkaloids publication trend

The graph below shows the total number of articles in biosynthesis and bioactivity of fritillaria alkaloids across all publications each year (not limited to Nature Index journals).

Technical terms

Steroidal alkaloid: A nitrogen-containing natural product built on a sterane (four-ring) backbone.

Mevalonate pathway: A metabolic route in plants that produces isopentenyl diphosphate, the precursor for many terpenoids.

Cytochrome P450 monooxygenase: An enzyme family that catalyses oxidative modifications of organic substrates in secondary metabolism.

Transcriptome: The complete set of RNA transcripts produced by the genome under specific conditions or developmental stages.

Metabolome: The full complement of small-molecule metabolites present in a biological sample at a given time.

References

1. Transcriptomic and metabolomic analyses provide new insights into the appropriate harvest period in regenerated bulbs of Fritillaria hupehensis. Frontiers in Plant Science (2023).
2. Efficacy, chemical composition, and pharmacological effects of herbal drugs derived from Fritillaria cirrhosa D. Don and Fritillaria thunbergii Miq.. Frontiers in Pharmacology (2022).
3. Natural drug sources for respiratory diseases from Fritillaria: chemical and biological analyses. Chinese Medicine (2021).