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ORIGINAL ARTICLE
Year : 2020  |  Volume : 16  |  Issue : 68  |  Page : 81-86  

Regulation of pro-inflammatory enzymes by the dragon fruits from Hylocereus undatus (Haworth) and squalene - its major volatile constituents


1 Institute of Marine Biotechnology, University Malaysia Terengganu, Kuala Terengganu, Malaysia; Department of Silviculture, Faculty of Forestry, University of Khartoum, Khartoum, Sudan
2 School of Chemical Sciences, University Sains Malaysia, Minden, Penang, Malaysia
3 Institute of Marine Biotechnology, University Malaysia Terengganu, Kuala Terengganu, Malaysia

Date of Submission25-Jun-2019
Date of Decision22-Aug-2019
Date of Web Publication31-Mar-2020

Correspondence Address:
Ibrahim M S. Eldeen
Institute of Marine Biotechnology, University Malaysia Terengganu, 21030 Kuala Terengganu

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/pm.pm_271_19

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   Abstract 


Background: Hylocereus undatus produces fruits known as dragon fruit (Pitaya). The fruit and other parts of Hylocereus species are used for the treatment of diuretic, gastritis, kidney problems, and wound healing. Objectives: To investigate anti-inflammatory properties of the flesh and peel of Pitaya and to identify the major bioactive constituent(s). Materials and Methods: The flesh and the peel of the fruit were blended separately with water, vacuum-distilled, freeze-dried, and then used for the bioassay tests against the 5-Lipoxygenase (5-Lipox), Cyclooxygenase-2 (COX-2), and Acetylcholinesterase (AChE) enzymes. Results: Squalene appeared to be the dominant constituent (13.2%) in the flesh of the fruit. The crude flesh extract and the squalene showed strong activities against AChE with inhibition percentage >80% (IC50 <43 μg/mL). The peel was active against 5-Lipox with inhibition of 81%. Inhibition percentages recorded for the positive controls used were 77% for Zileuton against 5-Lipox (IC5028 μg/mL), 85% for the Galantamine against AChE (IC50 16 μg/mL), and 86% for the Celecoxib against COX-2 (IC5032 μg/mL). For maximum efficacy against the three enzymes, squalene showed the best performance with EC50values ranging between 46 and 47 μg/mL. Conclusion: The findings showed that Pitaya has a significant potential for the management of inflammatory conditions through different mechanisms including, leukotriene, prostaglandins, and cholinergic pathways. To the best of our knowledge, identification of squalene in the dragon fruit flesh and the validated biological activities were not reported previously and therefore accounted for the novelty of the study.

Keywords: Anti-inflammatory, cholinergic, cyclooxygenase, dragon fruit, leukotriene, nutraceuticals


How to cite this article:
S. Eldeen IM, Foong SY, Ismail N, Wong KC. Regulation of pro-inflammatory enzymes by the dragon fruits from Hylocereus undatus (Haworth) and squalene - its major volatile constituents. Phcog Mag 2020;16, Suppl S1:81-6

How to cite this URL:
S. Eldeen IM, Foong SY, Ismail N, Wong KC. Regulation of pro-inflammatory enzymes by the dragon fruits from Hylocereus undatus (Haworth) and squalene - its major volatile constituents. Phcog Mag [serial online] 2020 [cited 2020 May 27];16, Suppl S1:81-6. Available from: http://www.phcog.com/text.asp?2020/16/68/81/281689



SUMMARY

  • Pitaya has a significant potential for the management of inflammatory conditions through different mechanisms including, leukotriene, prostaglandins, and cholinergic pathways. The study also confirmed the presence of squalene in the flesh of the dragon fruit H.undatus. This indicates the health promoting properties of the dragon fruit as a nutraceutical diet. These properties in addition to the chemical contents known for the peel as a source of phenolic compounds will lead to various applications in food related industry and health




Abbreviations used: ATCl: Acetylcholine iodide; AChE: Acetylcholinesterase enzyme; DTNB: 5,5-dithiobis-2-nitrobenzoic acid; BSA: Bovine serum albumin; HFLS: Human fibroblast like synoviocytes; GC-MS: Gas chromatography-mass spectrometry; COX-2: Cyclooxygenase-2; 5-Lipox: 5-Lipoxygenase; MTT: Abbreviation for the dye compound 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium


   Introduction Top


Hylocereus undatus is a fruit plant indigenous to tropical and subtropical America. It produces fruits known as dragon fruit and Pitaya. The fruit comes in a number of varieties including Red Pitaya from H. undatus (red skin-white flesh) and Hylocereus polyrhizus (red skin-red flesh), and Yellow Pitaya (yellow skin-white flesh) form Hylocereus megalanthus.[1]

Pitaya received worldwide recognition especially in Asian countries such as Vietnam, Taiwan, Malaysia, and the Philippines, as an ornamental plant for its large, scented, night-blooming flowers and multipurpose uses which enable it to be of high economic potential.[2] Pitaya fruit juice contains wide range of chemical constituents such as citric and ascorbic acids, proteins, riboflavin, niacin, and several minerals such as Ca, P, Fe, in addition to phenolic compounds including gallic acid and catechins.[3] The seeds of the fruits of Hylocereus fruits were also reported to be rich in polyunsaturated fatty acids and linoleic acid.[4] However, no detailed data made available on the volatile constituents of Hylocereus fruits flesh.

Different parts of Hylocereus species were reported to be used for medicinal purposes. The leaves and flowers of H. undatus were used by the old Mayas for hypoglycemic purposes, as a diuretic and healing agent.[5] The fruits and flowers used for gastritis and kidney problems.[6] Perez et al.,[7] studied the wound healing properties of aqueous extracts from different parts of H. undatus including fruit pulp. Based on their observation, they stated that a topical application of H. undatus caused a remarkable increase in hydroxyproline, tensile strength, and improved epithelialization. Effects of extracts from some cacti were also linked with the central nervous system (CNS) stimulants and regulators of blood pressure, sleep, hunger, and thirst.[8] Pitaya seeds were also reported to contain oil with high level of functional lipids in addition to their biological properties.[1],[4],[9]

Phytochemical analysis of the peel of Hylocereus species indicated that the peel is rich of betalains which comprises the red-violet betacyanins and yellow betaxanthins. Betacyanins are known to possess some biological properties with potential application in pharmaceutical industry. Luo et al.,[10] reported results of a phytochemical analysis and in vitro evaluation of extracts of pitaya (dragon fruit) peels from H. undatus and H. polyrhizus, in which the main components of H. undatus were found to be β-amyrin, γ-sitosterol, and octadecane. According to the authors, these compounds were responsible for the observed cytotoxic activities of the extracts. This was similar to a previously reported antiproliferative activity of red Pitaya peel in melanoma cells.[11]

Due to the popularity and wide usage of the dragon fruits and the reputable medicinal properties, we attempt to investigate the potential anti-inflammatory properties of extracts from the flesh and peel of H. undatus. This report highlights phytochemical analysis, and bio-efficacy of extracts from the dragon fruit of H. undatus against the pro-inflammatory enzymes 5-Lipoxygenase (5-Lipox), Cyclooxygenase-2 (COX-2), and Acetylcholinesterase (AChE). The report also highlights inhibitory effects of squalene, as a major constituent identified in the flesh extract, against the three enzymes.


   Materials and Methods Top


The name H. undatus (Haw.) Britton and Rose has been checked with http://www.theplantlist.org/tpl1.1/record/kew-2856879 (accessed on May 2018). This name is the accepted name of this species in the genus Hylocereus (data supplied on March 23, 2012). The plant materials were purchased from a local fruit hypermarket in Kuala Terengganu, Malaysia (GPS coordination: 5o22'52.93”N, 103o04'57.58”E). The sample was authenticated by Dr. Suliman Eldeen, a curator in the institute and a voucher specimen (Eldeen 39-D) was deposited. All the fruits were first washed with distilled water and the peel removed. The flesh (300 g) and the peel (180 g) were blended separately with 300 mL water and then immediately vacuum-distilled for 5 h, yielding approximately 220 mL and 150 mL of distillate from the flesh and peel respectively. Only the flesh distillate was used for phytochemical analysis by extraction with dichloromethane (5 mL × 25 mL). The extract was then concentrated using a Kuderna-Danish concentrator at a bath temperature 50°C and reduced to a final volume of 0.1 mL under a gentle stream of N2 gas at room temperature before gas chromatography (GC) analysis. The vacuum distillation was performed in duplicate by adding heptadecane (2.4 mg) and dotriacontane (2.3 mg) to the macerated fruits to estimate the efficiency of the vacuum distillation.

Gas chromatography-mass spectrometry

The GC flame ionization detection (GC FID) analysis was carried out using a Thermo Finnigan instrument (San Jose, CA, USA). Briefly, two fused-silica capillary columns SPB-1 and Supelcowax 10 were used. The initial oven temperature for both the columns was set at 40°C for 5 min, then to 220°C at 5°C/min and held for 15 min. Injector port and detector temperatures were set at 250°C. The percentages of the peak area of each components [Table 1] were the average values of two injections of the isolated volatiles. The absolute amounts of the major components were calculated from the peak area percentages using the predetermined response factors, and the mean values from the two injections. The retention indices (RI) relative to those of n alkanes (C5-C-32) were calculated.
Table 1: The volatile constituents identified in the flesh of Pitaya from Hylocereus undatus

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With the implementation of the same capillary GC conditions as described above, the GC/mass spectrometry (MS) analysis was performed using a Perkin-Elmer Clarus 600T (Waltham, MA, USA). The compounds were identified by the comparison of their mass spectra with the data of authentic compounds or with reference spectra recorded in the library. The findings were further analyzed against the RI obtained with those of authentic compounds or with data in the literature.[12]

Biological tests and in vitro bioassay models used

Fifty milliliter of each of the distillated flesh and peel were subjected to a water evaporator and concentrated to dryness. The concentrated solution was then freeze-dried to yield 11 and 7 mg for flesh and peel, respectively. The dried materials were used for the bioassay tests. Squalene appeared to be the major constituents as indicated by the GC-MS analysis. Thus, a pure squalene compound (≥98%) liquid with molecular weight of 410.72, CAS Number: 111-02-4, was purchased from Sigma Aldrich (Catalogue no. S3626) and subjected for the biological tests.

5-Lipoxygenase inhibitor screening assay

The biological performances of the extracts and the squalene against the 5-Lipox enzyme inhibitory effects were evaluated using the 5-Lipox inhibitor screening assay kit (Item No. 760700; Cayman Chemical, USA). A detailed description about the method is available in our previous reports.[13],[14] The test materials were dissolved in methanol to the concentration of 100 μg/mL, while the positive control used (Zileuton) was dissolved to a concentration of 50 μg/mL. The arachidonic acid (10 μL) was added to each well of the 96-well plate used to initiate the reaction. The plate was placed on a shaker for 5 min after which the chromogen was added to stop the reaction. The Graph pad prism was used to calculate the IC50 values, and the results presented are the means of three separate tests.

Cyclooxygenase inhibitor screening assay

The inhibition of prostaglandin biosynthesis by the extracts and the squalene was assessed using the COX inhibitor screening assay kit (No. 560131; Cayman Chemical, USA) based on the manufacturer's protocol provided with the kit. The method of the test was fully described in our earlier reports.[13],[14] The drug celecoxib was used as a positive control.

Acetylcholinesterase enzyme inhibitory activity

The assessment of the inhibitory effects on AChE biosynthesis by the extracts, and squalene was carried out using the microplate assays. A detailed description of the bioassay can be found in our previous reports.[13],[14],[15]


   Results Top


Gas chromatography-mass spectrometry analysis and identification of the major constituents

On low-temperature vacuum distillation, the Pitaya fruit from H. undatus afforded essences which possessed the aroma characteristic of the fruits. The identified volatile constituents, together with the GC-FID peaks areas, are presented in [Table 1]. Fifty-nine compounds (constituting 99.5% of the sample by peak area per cent) were identified. A total of 23 alcohols were detected accounted for about 37% of the volatiles, of which 1-hexanol, 1-octadecanol, 1-hexadecanol, and 1-tetradecanol were clearly dominant. Carboxylic acids were the second most abundant constituents with the linoleic acid, oleic acid, and palmitic acid being the main derivatives. From an aroma standpoint, aldehydes are important flavor contributors. Eight aldehydes, accounting for 1.2% of the isolate, were detected. Hexanal, (E)-2-hexenal, nonanal, decanal, (E, E)-2, 4-decadienal together with hexanol and the unsaturated C6 alcohols, (E)-3-hexen-1-ol, (Z)-3-hexen-1-ol and (E)-2-hexen-1-ol, presumably contributed to the fatty-green odor of the fruit. Squalene appeared to be the most dominant constituents in the Pitaya flesh with a high proportion of 13.2% of the peak area. Squalene is a polyunsaturated hydrocarbon with a formula of C30H50 and formed by six isoprene units. It has gained attraction after being identified in the shark liver extract and therefore considered as the main source of the compound in addition to some other natural sources such as olive oil.[16],[17] The occurrence of squalene at such high concentration in the flesh of the dragon fruit in this study was noteworthy, and to the best of our knowledge, this triterpene has not been reported as a fruit volatile in the flesh of H. undatus. However, squalene was reported presence in a lower concentration in the peel extracts of both H. undatus and H. polyrhizus.[10]

Biological activities observed by the extracts and the squalene compound

Inhibition of the pro-inflammatory enzymes 5-Lipox, COX-2, and AChE enzymes by the dragon fruit flesh and peel extracts, squalene, and the positive standard drugs (Zileuton, Celecoxib, and Galanthamine) were obtained using the bioassay models as described earlier. The obtained results are presented in [Table 2]. The dragon flesh extract possessed high inhibitory effects against AChE with inhibition percentage of 87% and IC50 value of 35 μg/mL. The extract, however, showed moderate performance against both COX-2 and 5-Lipox. Interestingly, similar effects were also observed by the squalene compound against AChE, and with slightly higher activities against COX-2 and 5-Lipox. Extract of the peel appeared more active against 5-Lipox with inhibition of 81% but was found weaker against AChE and COX-2. Inhibition percentages recorded for the positive controls used were 77% for Zileuton against 5-Lipox (IC50 28 μg/mL), 85% for the Galanthamine against AChE (IC50 16 μg/mL), and 86% for the Celecoxib against COX-2 (IC5032 μg/mL).
Table 2: Inhibition of 5-lipoxygenase, cyclooxygenase-2 and Acetylcholinesterase enzymes by the dragon fruit flesh and peel extract, and squalene compound as detected using the in vitro biological models

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The concentration responses of the tested materials and the standard drugs against the three enzymes were assessed using the relevant in vitro bioassay models for each test as mentioned earlier. Five different concentrations (25, 50, 75, 100, and 150 μg/mL) were used in three replicates [Figure 1]. Results were analyzed using graph pad prism to obtain the response curves and the maximum efficacy (Emax) for each sample.
Figure 1: Concentration response of the flesh, peel extracts of the dragon fruit, the squalene and the standard drugs (positive controls) against: (a) 5-Lipoxygenase enzyme; (b) Cyclooxygenase enzyme; and (c) Acetylcholinesterase enzyme

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The Emax (%) obtained against 5-Lipox by the tested samples at a concentration of 150 μg/mL were 89 (peel extract), 70 (flesh extract), 75 (squalene), and 100 (zileuton). EC50 obtained were 43, 69, 47, and 41 for the peel, flesh, squalene, and zileuton, respectively.

Emax obtained by the peel, flesh, and squalene at a concentration of 150 μg/mL against COX-2 were 66% (EC50 = 74), 71% (EC50 = 58), and 78% (EC50 = 46), respectively. Emax of 100% was recorded for the Celecoxib at a concentration of 100 μg/mL with an EC50 value of 11 μg/mL.

For AChE enzymes, the flesh extract and squalene showed relatively similar performance when tested at concentration of 100 μg/mL with an Emax of 87% (flesh extract, EC50 = 34 μg/mL) and 83% (squalene, EC50 = 46 μg/mL). The peel extract, however, at this concentration showed Emax of 69% with an EC50 of 46 μg/mL. Emax observed for the galanthamine at concentration of 100 μg/mL was 96% with an EC50 value of 17 μg/mL [Figure 1]. The flesh of the dragon fruit in this study showed the best performance against AChE followed by the peel against 5-Lipox. As per assessment of the overall performance against the three enzymes, squalene appeared to be the best performer with EC50 values ranging between 46 and 47 μg/mL. This was followed by the peel extract against 5-Lipox and AChE.


   Discussion Top


In this study, we investigated phytochemical analysis and anti-inflammatory properties of the dragon fruit (Pitaya) from H. undatus against three pro-inflammatory enzymes using in vitro models to reveal part of the possible underlying mechanism of actions. Both Lipox and COX pathways are found to be involved in the inflammatory actions. Discovery of molecules that inhibit both enzymes (COX-2 and 5-Lipox) would be an advantageous by targeting both proteins.[13] In addition to this, there are other mechanisms that contribute to the regulation of inflammatory response through the immunomodulatory circuit termed the cholinergic anti-inflammatory pathway. These mechanisms indicating the role of acetylcholine in macrophage deactivation and the involvement of the vagus and cholinergic receptors in the process.[18] Although it is argued that acetylcholine necessary for the cholinergic anti-inflammatory pathway are synthesized by T lymphocytes and not neural in origin, suppression of AChE enzyme will decrease the rapid hydrolysis of acetylcholine leading to enhancement of vagal stimulation and inhibition of localized pro-inflammatory factors.[19],[20] Extract from the flesh of dragon fruit in this study showed remarkable activities against the three enzymes, with stronger inhibition toward acetylcholinesterase enzyme. This indicates that the fruit can play a role on alleviation of inflammatory symptoms through mechanism related to cholinergic anti-inflammatory pathway. Moreover, the effects on both Lipox and COX enzymes observed in the flesh extract are interesting as it indicates its high potentiality for dual COX/Lipox effects which lead to blockage of both prostaglandins and Leukotrienes pathways. This indication of anti-inflammatory properties observed here is in agreement with a number of previous reports highlighted the medicinal properties of dragon fruits.[21],[22] Perez et al.[7] reported anti-inflammatory effects of aqueous extracts of different parts of H. undatus including rind and fruit pulp. They concluded that topical applications of H. undatus can increase the production of hydroxyproline, tensile strength, and total proteins and therefore facilitate the healing process.

Squalene was appeared to be the major constituents of the dragon fruit flesh; therefore, it may be responsible of the activities observed by the flesh extract in this study. This assumption is supported by the activities recorded for the squalene compound against the three enzymes tested which possessed relatively similar performance to that recorded for the flesh extract.

Squalene is a natural lipid belonging to the terpenoid family. Various classes of plant terpenoids have found to be effective as anti-inflammatory agents. Anti-inflammatory properties of squalene were previously indicated through different mechanisms including its role as an antioxidant agent which can protect the skin surfaces from lipid peroxidation.[23] It was also reported to ameliorate atherosclerotic lesions through the reduction of CD36 scavenger receptor expression in macrophages.[24],[25],[26] Cárdeno et al.[22] investigated effects of squalene against pro-inflammatory mediators and pathways modulating overactivation of neutrophils, monocytes, and macrophages. The authors revealed that squalene downregulated gene expression of COX-2 among other genes in lipopolysaccharide-activated human neutrophils and monocytes. They concluded that squalene has a significant role for the management of inflammatory conditions. These findings are in agreement with our results obtained for squalene against COX-2 enzyme. Moreover, our results showed high effect of squalene against AChE enzyme. This may suggest that the compound also regulates inflammation through the cholinergic pathway.[13],[14],[15] The remarkable inhibition of AChE activity by both squalene and the flesh extract in this study indicated their potential for therapeutic uses in the treatment of cognitive functions with relation to CNS disorders. Aguilera et al.[16] studied effects of squalene on a fetal alcohol syndrome, a disorders of the CNS associated with growth retardation. The authors concluded that squalene can be used to prevent the neuronal and glial damages. These findings support our current results obtained for squalene compound against AChE enzyme as one of the key players in CNS actions and inflammation process.

Dragon fruit peels are reported to contain higher concentration of betalains and can therefore be used as a source for pigment extraction. Betalains are plant colorants composed of a nitrogenous core structure betalamic acid. They are responsible for the cyanic colors of flower petals and fruits. Several studies confirmed the high radical scavenging activity of betalains.[27],[28] The peel of the dragon fruit in this study possessed higher activity against 5-Lipox enzyme followed by acetylcholinesterase but was weaker against COX-2. This may suggest that the anti-inflammatory effects of the peel act through mechanism other than prostaglandin pathway. However, inhibition of COX enzyme by betalains was previously suggested as one of the mechanisms for its anti-inflammatory properties.[29] The low inhibitory effect against COX-2 observed in this study may be due to the low concentration of the betalains in the extract used. Variation in chemical composition and structure of betalains from different sources may also lead to a different biological hits. Nonetheless, Rodriguez et al.[30] investigated anti-inflammatory properties of dragon fruit peel and revealed that its health-promoting properties attributed to its betalain content. Red beetroot betalains were also found to exert strong anti-inflammatory activity on carrageenan-induced paw edema with underlying mechanisms believed to be through inhibition of pro-inflammatory cytokines tumor necrosis factor-alpha and interleukin.[31] These findings support our current results indicating anti-inflammatory properties of the peel of the dragon fruits. The activities observed here may be due to the presence of betalain in the extract, with similar scenario for underlying mechanism of actions.


   Conclusion Top


Our results in this study confirmed the presence of squalene in the flesh of the dragon fruit from H. undatus and showed the potential anti-inflammatory properties of the flesh and the squalene. These findings indicate the health promoting properties of the dragon fruit as a nutraceutical diet to prevent some of neuronal and inflammatory related disorders. To the best of our knowledge, identification of squalene among the volatile constituents in the dragon fruit flesh and the assessed biological functions observed in this study were not reported elsewhere and therefore indicating the novelty of this work. The biological activities recorded for the dragon fruit peel are noteworthy as the peel is a waste material from consumption of the fruit. The obtained results suggest that the peel has significant potential for management of inflammatory-related conditions characterized by regulation of 5-Lipox and AChE enzymes. These properties in addition to the chemical contents known for the peel as a source of phenolic compounds will lead to various sophisticated applications in food-related industry and health. The obtained results represent a reference point for further research on the role of dragon fruit flesh and peel extracts on diseases associated with prolong inflammatory conditions. Currently, we are focusing on the effects of the extracts on rheumatoid arthritis using 3-dimensional pannus model.

Financial support and sponsorship

This work was supported by the Fundamental Research Grants (FRGS grant vot: 59321) from the Ministry of Higher Education, Malaysia, and the Research Grant RU1001/PKIMIA/811050 offered by University Sains Malaysia (USM)-Penang, Malaysia.

Conflicts of interest

There are no conflicts of interest.



 
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    Figures

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    Tables

  [Table 1], [Table 2]



 

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