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Platycodin D-induced apoptosis through nuclear factor-kappaB activation in immortalized keratinocytes
Kwang Seok Ahn1, Bum-Soo Hahn, Kyubum Kwack
1Natural Products Research Institute, College of Pharmacy, Seoul National University, 28 Yeonkun-Dong, Seoul 110-460, Korea.
European Journal of Pharmacology
|April 25, 2006
Summary
Platycodin D from Platycodi Radix induces apoptosis in human keratinocytes by activating the nuclear factor-kappaB (NF-kappaB) pathway. This leads to increased expression of Fas receptor and Fas ligand, crucial for programmed cell death.
Area of Science:
- Pharmacology
- Cell Biology
- Molecular Biology
Background:
- Platycodi Radix is traditionally used for respiratory ailments.
- Platycodin D is a key saponin in Platycodi Radix.
- Understanding its mechanism in skin cells is important.
Purpose of the Study:
- To investigate the mechanism of apoptosis induced by Platycodin D in HaCaT cells.
- To explore the role of nuclear factor-kappaB (NF-kappaB) signaling in Platycodin D-induced apoptosis.
- To examine the involvement of death receptors like Fas in this process.
Main Methods:
- Assessing apoptosis markers: DNA fragmentation, caspase-3, and caspase-8 activation.
- Investigating NF-kappaB pathway activation using IKK-beta and NF-kappaB inhibitors (TPCK).
- Analyzing Fas receptor and Fas ligand (FasL) expression and their promoter activity.
Main Results:
- Platycodin D induced apoptosis in HaCaT cells.
- Apoptosis was mediated by activation of inhibitor of nuclear factor-kappaB kinase (IKK)-beta and NF-kappaB.
- NF-kappaB activation upregulated Fas receptor and FasL expression, essential for apoptosis.
Conclusions:
- Platycodin D triggers apoptosis in human keratinocytes via the NF-kappaB pathway.
- The NF-kappaB pathway's transcriptional activation of Fas receptor and FasL is key.
- This study elucidates a novel mechanism for Platycodin D's action in HaCaT cells.