Related Experiment Video
Updated: Aug 4, 2025

Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis
Published on: January 31, 2025
Hydroxylated cyclopamine analogues from Veratrum californicum and their hedgehog pathway inhibiting activity
Giuseppina Chianese1, Annalisa Lopatriello1, Carmina Sirignano1
1Department of Pharmacy, School of Medicine and Surgery, University of Naples Federico II, Via Montesano 49, 80131 Naples, Italy.
Abstract:
Cyclopamine (1), the teratogenic steroidal alkaloid isolated from corn lily (Veratrum californicum), has recently gained renewed interest due to its anticancer potential, that has been translated into the FDA approval of three Hedgehog (Hh) pathway inhibiting antitumor drugs. A chemical analysis of mother liquors obtained from crystallization of cyclopamine, extracted from roots and rhizomes of V. californicum, resulted in the isolation of two unprecedented cyclopamine analogues, 18-hydroxycyclopamine (2) and 24R-hydroxycyclopamine (3), the first compounds of this class to show modifications on rings D-F. The stereostructures of these new natural compounds have been established based on a detailed MS and 1D/2D NMR investigation. The isolated compounds were evaluated with the dual-luciferase bioassay for their inhibition of the hedgehog pathway in comparison to cyclopamine, providing new insights into the structure-activity relationships for this class of compounds.
More Related Videos
Related Concept Videos
Hedgehog Signaling Pathway
Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Cholinergic Antagonists: Chemistry and Structure-Activity Relationship
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
The direct-acting...
Indirect-Acting Cholinergic Agonists: Mechanism of Action
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
Drugs Acting on Autonomic Ganglia: Blockers

