Differences in Neuritogenic Activity and Signaling Activation of Madecassoside, Asiaticoside, and Their Aglycones in Neuro-2a cells
Abstract
Abstract Madecassoside (MS) and asiaticoside (AS) along with their aglycones, madecassic acid (MA) and asiatic acid (AA), are considered the major neuroactive triterpenoid constituents of Centella asiatica. In this study, we aimed to compare MS, AS, MA, and AA for their neurite outgrowth activities and mechanisms in Neuro-2a cells. Immunofluorescent cell staining showed MS and AS significantly increased the percentage of neurite-bearing cells (%NBC) and the neurite length with higher potency than MA and AA. The triterpenoid glycosides induced sustained extracellular signal-regulated protein kinases 1 and 2 (ERK1/2) phosphorylation, while their aglycones activated only transient signaling of ERK1/2. Suppression of ERK1/2 activation significantly abolished not only cAMP response element-binding protein (CREB) phosphorylation but also the increment of %NBC and neurite length in MS- and AS-treated cells. Inhibition of ERK phosphorylation did not produce similar blockage of CREB activation and neurite outgrowth in MA- and AA-treated cells. On the other hand, inactivation of protein kinase B (Akt) resulted in a suppression of neurite lengthening in all studied triterpenoids. This is the first study discerning the different signaling pathways of neurite outgrowth activity induced by C. asiatica triterpenoid glycosides and aglycones. Neurite outgrowth activity of the glycosides MS and AS was found to involve the activation of sustained ERK phosphorylation leading to CREB activation, while ERK activation was not associated with MA- and AA-induced neurite outgrowth. In addition, Akt activation was evident to be more involved in neurite elongation process.
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In vitro studies show CAW whole extract and isolated compounds facilitate neurite outgrowth and elicit neuroprotection.
“Previously, in vitro studies have shown that both CAW whole extract and isolated compounds (detailed in a review [32]) facilitate neurite outgrowth [6,28,106], and elicit neuroprotection [107,108,109,110,111].”
From Centella Asiatica Improves Memory and Promotes Antioxidative Signaling in 5XFAD Mice (2019) · cites this paper as [106]
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- Authors
- Nalinratana, N., Meksuriyen, D., & Ongpipattanakul, B.
- Affiliations
- Chulalongkorn University (TH)
- Rangsit University (TH)
- Venue
- Planta Medica
- Publisher
- Georg Thieme Verlag KG
- Published
- 2018-05-02
- Volume
- 84
- Issue
- 16
- Pages
- 1165-1173
- ISSN
- 0032-0943 (ISSN-L)
- 1439-0221
- OpenAlex
- W2802940337
- Cited by
- 22
- References
- 44
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 4 · 2020: 3 · 2019: 3 · 2018: 2
- FWCI
- 4.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Planta Medica (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Chulalongkorn University
- Topics
- Health Sciences › Medicine › Complementary and alternative medicine › Medicinal Plants and Neuroprotection
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Natural product bioactivities and synthesis
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
- Keywords
- madecassoside, asiaticoside, madecassic acid, asiatic acid, Centella asiatica, triterpenoid saponins, neurite outgrowth, N2a cells, ERK1/2 phosphorylation, CREB phosphorylation, Akt signaling, neuritogenic activity, signaling pathways
- MeSH terms
- Animals, Cell Survival, Phosphorylation, Triterpenes, Neurites, Cyclic AMP Response Element-Binding Protein, Mitogen-Activated Protein Kinase 1, Centella, Cell Line, Tumor, Mice, Pentacyclic Triterpenes
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