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Hypotensive Effects and Angiotensin-Converting Enzyme Inhibitory Peptides of Reishi (Ganoderma lingzhi) Auto-Digested Extract

1
Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan
2
Beauty Care Products Division, Nagase & Co. Ltd., Nishi-ku, Kobe, 651-2241, Japan
*
Author to whom correspondence should be addressed.
Molecules 2014, 19(9), 13473-13485; https://doi.org/10.3390/molecules190913473
Received: 19 June 2014 / Revised: 14 July 2014 / Accepted: 25 August 2014 / Published: 29 August 2014
(This article belongs to the Section Natural Products Chemistry)
Reishi (Ganoderma lingzhi) has been used as a traditional medicine for millennia. However, relatively little is known about this mushroom’s proteins and their bioactivities. In this study, we used reishi’s own proteases to hydrolyze its protein and obtained auto-digested reishi (ADR) extract. The extract was subjected to in vitro assays and administered to spontaneous hypertensive rats (SHRs) to determine its potential for use as a hypotensive medication. Bioassay-guided fractionation and de novo sequencing were used for identifying the active compounds. After 4 h administration of ADR, the systolic pressure of SHRs significantly decreased to 34.3 mmHg (19.5% change) and the effect was maintained up to 8 h of administration, with the decrease reaching as low as 26.8 mmHg (15% reduction–compare to base line a decrease of 26.8 mmHg is less than a decrease of 34.3 mmHg so it should give a smaller % reduction). Eleven peptides were identified and four of them showed potent inhibition against ACE with IC50 values ranging from 73.1 μM to 162.7 μM. The results showed that ADR could be a good source of hypotensive peptides that could be used for antihypertensive medication or incorporation into functional foods. View Full-Text
Keywords: ACE inhibitors; hypotensive effects; de novo sequencing; active peptides; auto-digested; Ganodermataceae; Ganoderma lingzhi ACE inhibitors; hypotensive effects; de novo sequencing; active peptides; auto-digested; Ganodermataceae; Ganoderma lingzhi
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Tran, H.-B.; Yamamoto, A.; Matsumoto, S.; Ito, H.; Igami, K.; Miyazaki, T.; Kondo, R.; Shimizu, K. Hypotensive Effects and Angiotensin-Converting Enzyme Inhibitory Peptides of Reishi (Ganoderma lingzhi) Auto-Digested Extract. Molecules 2014, 19, 13473-13485.

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