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The Hydroxyl at Position C1 of Genipin Is the Active Inhibitory Group that Affects Mitochondrial Uncoupling Protein 2
Yang Yang1, Yifu Yang1, Jianwei Hou2
1Laboratory of Immunology and Virology, Experiment Center For Science and Technology, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
Abstract:
Genipin (GNP) effectively inhibits uncoupling protein 2 (UCP2), which regulates the leakage of protons across the inner mitochondrial membrane. UCP2 inhibition may induce pancreatic adenocarcinoma cell death by increasing reactive oxygen species (ROS) levels. In this study, the hydroxyls at positions C10 (10-OH) and C1 (1-OH) of GNP were hypothesized to be the active groups that cause these inhibitory effects. Four GNP derivatives in which the hydroxyl at position C10 or C1 was replaced with other chemical groups were synthesized and isolated. Differences in the inhibitory effects of GNP and its four derivatives on pancreatic carcinoma cell (Panc-1) proliferation were assessed. The effects of GNP and its derivatives on apoptosis, UCP2 inhibition and ROS production were also studied to explore the relationship between GNP's activity and its structure. The derivatives with 1-OH substitutions, geniposide (1-GNP1) and 1-ethyl-genipin (1-GNP2) lacked cytotoxic effects, while the other derivatives that retained 1-OH, 10-piv-genipin (10-GNP1) and 10-acetic acid-genipin (10-GNP2) exerted biological effects similar to those of GNP, even in the absence of 10-OH. Thus, 1-OH is the key functional group in the structure of GNP that is responsible for GNP's apoptotic effects. These cytotoxic effects involve the induction of Panc-1 cell apoptosis through UCP2 inhibition and subsequent ROS production.
Insights
Genipin (GNP) triggers pancreatic cancer cell death by inhibiting uncoupling protein 2 (UCP2), increasing reactive oxygen species (ROS). The 1-hydroxyl group (1-OH) on GNP is crucial for this apoptotic effect.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Uncoupling protein 2 (UCP2) regulates mitochondrial proton leakage and is implicated in cancer cell survival.
- Genipin (GNP) is known to inhibit UCP2, potentially leading to increased reactive oxygen species (ROS) and cancer cell death.
- The specific functional groups within GNP responsible for its biological activity require elucidation.
Purpose of the Study:
- To investigate the role of specific hydroxyl groups (1-OH and 10-OH) in genipin's structure regarding its inhibitory effects on pancreatic cancer cells.
- To determine the key functional group responsible for genipin's cytotoxic and apoptotic effects on pancreatic adenocarcinoma cells (Panc-1).
- To explore the structure-activity relationship of genipin in inducing apoptosis via UCP2 inhibition and ROS production.
Main Methods:
- Synthesis and isolation of four genipin derivatives with modifications at the C10 or C1 hydroxyl positions.
- Assessment of the inhibitory effects of genipin and its derivatives on Panc-1 cell proliferation.
- Evaluation of the impact of genipin and its derivatives on apoptosis, UCP2 inhibition, and ROS production.
Main Results:
- Genipin derivatives lacking the 1-OH group (geniposide and 1-ethyl-genipin) showed no cytotoxic effects on Panc-1 cells.
- Derivatives retaining the 1-OH group (10-piv-genipin and 10-acetic acid-genipin) exhibited biological effects similar to genipin, even without the 10-OH group.
- The 1-OH group was identified as the critical functional group responsible for genipin's apoptotic effects.
Conclusions:
- The 1-hydroxyl (1-OH) group is essential for genipin's cytotoxic activity against pancreatic cancer cells.
- Genipin induces Panc-1 cell apoptosis through the inhibition of UCP2, leading to increased ROS production.
- Understanding the structure-activity relationship of genipin provides insights for developing targeted cancer therapies.
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