Differential effects of the steaming time and frequency for manufactured red Liriope platyphylla on nerve growth factor secretion ability, nerve growth factor receptor signaling pathway and regulation of calcium concentration

Choi,Sun  Il; Goo,Jun  Seo; Kim,Ji  Eun; Nam,So   Hee; Hwang,In  Sik; Lee,Hye  Ryun; Lee,Young  Ju; Son,Hong  Joo; Lee,Hee   Seob; Lee,Jong   Sup; Kim,Hak   Jin; Hwang,Dae  Youn

doi:10.3892/mmr.2012.1024

Differential effects of the steaming time and frequency for manufactured red Liriope platyphylla on nerve growth factor secretion ability, nerve growth factor receptor signaling pathway and regulation of calcium concentration

Authors:
- Sun Il Choi
- Jun Seo Goo
- Ji Eun Kim
- So Hee Nam
- In Sik Hwang
- Hye Ryun Lee
- Young Ju Lee
- Hong Joo Son
- Hee Seob Lee
- Jong Sup Lee
- Hak Jin Kim
- Dae Youn Hwang
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Affiliations: College of Natural Resources and Life Science, Pusan National University, Miryang 627-706, Republic of Korea, College of Human Ecology, Pusan National University, Busan 609-735, Republic of Korea, Nonghyup Sandong Processing Plant, Miryang 627-706, Republic of Korea, School of Biosystem and Biomaterial Science and Engineering, Seoul National University, Seoul 151-921, Republic of Korea
Published online on: August 8, 2012 https://doi.org/10.3892/mmr.2012.1024
Pages: 1160-1170

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Abstract

The herb Liriope platyphylla (LP) has been considered to have curative properties for diabetes, asthma and neurodegenerative disorders. To examine the effects of steaming time and frequency of manufactured red LP (RLP) on the nerve growth factor (NGF) secretion ability and NGF receptor signaling pathway, the NGF concentration, cell differentiation, NGF signaling pathway and calcium concentration were analyzed in neuronal cells treated with several types of LPs manufactured under different conditions. The maximum NGF secretion was observed in B35 cells treated with 50 µg/ml LP extract steamed for 9 h (9-SLP) and with two repeated steps (3 h steaming and 24 h air-dried) carried out 7 times (7-SALP). No significant changes in viability were detected in any of the cells treated with the various LPs, with the exception of 0-SLP and 0-SALP. In addition, PC12 cell differentiation was induced by treatment with the NGF-containing conditional medium (CM) collected from the RLP-treated cells. The levels of TrkA and extracellular signal-regulated kinase (ERK) phosphorylation in the high affinity NGF receptor signaling pathway were significantly higher in the cells treated with 3-SLP or 1-SALP/3-SALP CM compared with those treated with the vehicle CM. In the low affinity NGF receptor pathway, the expression levels of most components were higher in the 9-, 15- and 24-SALP CM-treated cells compared with the vehicle CM-treated cells. However, this level was significantly altered in cells treated with 3-SALP CM. Furthermore, an examination of the RLP function on calcium regulation revealed that only the LP- or RLP-treated cells exhibited changes in intracellular and extracellular calcium levels. RLP induced a significant decrease in the intracellular calcium levels and an increase in the extracellular calcium levels. These results suggest the possibility that steaming-processed LP may aid in the relief of neurodegenerative diseases through the NGF secretion ability and NGF signaling pathway.

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