Naturally occurring Piper plant amides potential in agricultural and pharmaceutical industries: perspectives of piperine and piperlongumine
Applied Biological Chemistry volume 62, Article number: 63 (2019)
Piperaceae plants consist of about 3600 species, of which about 2000 are Piper plants. Their habitat is distributed across pantropical regions. The representative plant is Piper nigrum, known as black pepper. These plants have been widely used in folk medicine in Korean traditional medicine. This review collected papers identifying and separating the amides obtained from these Piper plants, with a focus on Piper amides potential to control the production and growth of fungal strains that cause plant disease and their insecticidal properties against agricultural pests. Piper amide benefits include antiaflatoxigenic activities, antiparasitic activities, anticancer properties, antiplatelet activities, and anti-inflammatory activities, among other therapeutic properties for the treatment of human diseases. In addition, this review paper provides a total synthesis study on the mass production of Piper amides and their derivatives, with a formulation study for industrial use. This review paper is designed to help inform future studies on Piper amide applications.
Piperaceae plants produce natural substances called Piper amides, and extracts of these plants have long been used to treat human diseases in traditional medicine fields in India, China, and Korea. Current research is focused on finding the active ingredients in these extracts. These extracts are also used as insecticides or fungicides in agricultural fields to secure human food productivity. In addition, black pepper is a common table spice and is closely associated with human activity across cultures and regions.
In this review paper, the characteristic amides of each Piper plant were classified based on research papers detailing the separation and purification of these compounds. The biological activities of these amides are briefly introduced, and their inhibitory action and related enzymatic activity are also discussed. These biological activities were then divided into agricultural and human disease treatment areas. This review focuses on insecticidal effects, fungicidal effects, effects on diseases mediated by insects such as mosquitoes and flies, anticancer effects in human disease treatment, and anti-inflammatory and anti-thrombotic properties of Piper amides. Among them, piperlongumine was selected to describe in more detail because of its potent biological activity compared to other amides.
Isolation and identification of amides from Piper plants using HPLC
Qualitative and quantitative analyses of Piper amides are mainly confirmed using the high-performance liquid chromatography (HPLC) method. The active ingredients and plant extracts that have effects as GABAA receptor modulators were verified with a fluorometric imaging plate reader (FLIPR) assay using Chinese hamster ovary cells transfected with the α1β2ρ2 subunit of GABAA receptor, designed to test multiple plant extracts and active compounds  (Fig. 1). Piperine (1) was separated by HPLC from the 0.4–1.2 mg of Piper nigrum extract and showed an EC50 value of 5.76 ± 0.7 µM as GABAA receptor modulator.
Recently, a study on the metabolic processes of piperine, piperlongumine (2), and pellitorine (3), the major pharmaceutical ingredients of Piper longum, was conducted using HPLC-LTQ-Orbitrap MS . Authors compared and confirmed metabolites of the three natural Piper amides using liver microsomes of humans, rhesus monkeys, beagles, rats, and mice. Piperine was degraded, and three metabolites were identified, two types of piperlongumine, and one type of pellitorine. Major metabolites were derived through demethylation and oxidation reactions on the methylenedioxy group in the amide molecular structures, and differences among species were revealed therein.
The permeability of GABAA modulators in naturally occurring compounds enabling passage through the blood–brain barrier (BBB) was evaluated using three different types of experimental BBB models, immortalized hBMEC cells, an endothelial cell model similar to a human brain, and primary cell models with co-cultures of bovine endothelial cells and rat astrocytes . Evidence suggested that piperine could enter the brain through the BBB, as determined by UHPLC-MS/MS, in the range of 5 to 500 ng/mL levels in the matrix.
Another study reported on qualitative and quantitative analyses of 18 major alkaloids found in Piper longum using UHPLC-DAD-MS . In this study, 25 amide alkaloids were analyzed, and researchers confirmed that piperine, pipernonaline (4), guineensine (5), and N-isobutyl-2-E,4E-octadecadienamide (6) could be used as representative markers of P. longum amides. These four amide alkaloids were assessed and quantified as 57.7 mg/g for piperine, 65.6 mg/g for pipernonaline, 17.7 mg/g for guineensine, and 23.9 mg/g for N-isobutyl-2-E,4E-octadecadienamide in the alkaloid fraction of P. longum. Their results also indicated that HPLC could accurately quantify amides contained in the solvent fraction of the Piper plant and could be used to promote standardization in herbal medicine.
A study was also conducted on Thai traditional medicines referred to as Benjakul, which include five plant extracts: P. chaba, P. sarmentosum, P. interruptum, Plumbago indica, and Zingiber officinale . Among them, naturally occurring substances with high cytotoxicity against the human small lung cancer cell line NCI-HI 688 were isolated by HPLC from the hexane solvent fraction of Benjakul ethanol extract. The compound with the highest content was piperine, and that with the highest cytotoxicity was plumbagin, with an IC50 value of 1.41 ± 0.01 µg/mL.
As described above, qualitative and quantitative analyses of Piper amide frequently employ HPLC for a range of purposes, predominantly to identify the types of amide in each plant and define their chemical fingerprints. This includes a study that analyzed the amides produced by different components of the P. ovatum plant . P. ovatum has been used in traditional medicine to relieve inflammation and provide analgesia, and the study reported how much of the amide compounds were distributed among hydroethanolic fractions of the leaves, stems, and roots of the plant. Piperlongumine was used as a standard material, and method validation was conducted to establish optimal experimental conditions. Under these analytical conditions, piperlongumine and piperovatine (7) were each identified in all of the components of P. ovatum using HPLC, indicating it is suitable for routine quantitative analysis of amides in plant extracts.
Insecticidal amides from Piper plants
The amides derived from Piper plants have been reported to have many insecticidal properties that could be applied to control insect pests on agricultural fields. This section introduces certain amides possessing insecticidal capacity and the Piper plants in which they are found.
Recently, larvae from the diamondback moth (Plutella xylostella) were exposed to two newly isolated amide compounds from P. nigrum, piperolein B (8) and piperchabamide D (9); these compounds demonstrated 96.7% and 79.2% mortality, respectively, at a concentration of 0.1 mg/mL . The duration of exposure to the material under these experimental conditions was 4 days. On the basis of these results, these compounds were suggested as potential alternatives to synthetic pesticides currently in use.
In another study, pellitorine and 4,5-dihydropiperlonguminine (10) were isolated from P. tuberculatum to assess their control of the velvetbean caterpillar (Anticarsia gemmatalis). These compounds were potent at 200 and 700 µg/insect for pellitorine and 4,5-dihydropiperlonguminine, respectively . LD50 values were then obtained for the two amides and found to be 31.3 and 122.3 µg/insect for pellitorine and 4,5-dihydropiperlonguminine, respectively.
Another study exposed Musca domestica and Drosophila melanogaster to the ethyl acetate fraction of P. nigrum containing insecticidal amides and assessed differential gene expression in D. melanogaster after the treatment to uncover genes whose expression levels varied by at least a factor of two using cDNA microarray analysis . Among them, cytochrome P450 isozymes, including Cyp 6a8, Cyp 9b2, and Cyp 12d1, were at least two-fold up-regulated in the P. nigrum-treated groups. Based on these results, cytochrome P450 was proposed as an enzyme that participated in the decomposition of amides .
Similarly, P. nigrum plants have been reported to have many amide-based substances with insecticidal effects, including wisanine (11) and piptigrine, which exhibited pesticidal activity at the 30 ppm and 15 ppm levels, respectively, on the fourth instar of Anopheles aegypti [11, 12]. As mentioned above, Piper amides have strong insecticidal capacities, which can lead to larvae mortality of mosquitoes, a significant disease vector to humans. Below, we provide a list of studies demonstrating insecticidal effects on mosquito larvae. In recent years, insect pests have developed comprehensive resistance to currently used insecticides, causing breakdowns in insect control. This common phenomenon occurs in mosquitoes and many other insect pests, and the studies detail the results of using natural amides to control mosquitoes possessing resistance to conventional insecticides.
Samuel et al.  reported that piperine, a representative amide in P. nigrum, had been used to control insecticide-resistant and susceptible strains of Anopheles mosquitoes. Strains of Anopheles spp. were An. arabiensis, An. coluzzii, An. gambiae, An. quadriannulatus, and An. funestus. Anopheles strains resistant and susceptible to insecticides were found to be susceptible to black pepper and piperine, suggesting these compounds could be an alternative to currently used larvicides to control mosquito larvae.
Insecticidal effects on Culex pipiens pallens and Aedes aegypti female adults were examined using piperine and the isobutylamides pellitorin, guineensine, pipercide (12), and retrofractamide A (13) from P. nigrum . Among them, pellitorine was the most toxic compound, at 0.4 µg/female C. pipiens adult, followed by guineensine, retrofractamide A, and pipercide. The positive insecticide, chlorpyrifos, was potent at 0.03 µg/female insect, about 10 times lower than currently used insecticides, suggesting natural amides could be potent insecticides in the field. Another important Piper plant, P. longum, produces pipyahyine, which was isolated and purified as a new mosquito larvicidal amide . Its LC50 and LC90 values were 1.03 and 2.04 ppm, respectively, against fourth instar larvae of C. quinquefasciatus.
Antifungal and antiparasitic amides from Piper plants
Sixteen natural substances have been successfully isolated from the roots of P. sarmentosum, of which sarmentamide A, B, and C were the first to be reported. Sarmentine and sarmentosine showed strong inhibitory effects against Plasmodium falciparum (K1 type, a multidrug resistant strain) with EC50 values of 4.5 and 3.9 µg/mL, respectively . Among them, brachyamide B and sarmentosine exhibited potent antifungal activities against Candia albicans as evaluated by formazan assay method, with EC50 values of 41.82 and 32.82 µg/mL, respectively.
Piper amides have been shown to inhibit the growth of mycotoxin-producing fungi and their production of mycotoxins, especially aflatoxin and ochratoxin. Aflatoxin is mainly produced by Aspergillus flavus and A. parasiticus, and ochratoxin by Aspergillus ochraceus. The Piper amides that inhibited the growth of A. flavus (WRRC-3-90-42-12) included piperine, piperlongumine, pipernonaline, and piperoctadecalidine . These amides are mainly found in P. longum and P. nigrum. Piperlongumine demonstrated a potent inhibitory effect on the growth of A. flavus at a concentration of 0.2%, and antiaflatoxigenic activity at a concentration of 0.1%. Similarly, piperine and piperlongumine completely inhibited the production of ochratoxin A, ochratoxin B, and citrinin at a concentration of only 0.001% in A. auricomus, A. sclerotiorum, and A. alliaceus. When curcumin was used in combination with these compounds, growth of A. alliaceus was inhibited by approximately 70% at a concentration of 0.1%, while the production of ochratoxin A was inhibited at a concentration of 0.01% .
New isobutyl amides were isolated from two other Piper plants, P. scutifolium and P. hoffmanseggianum, identified as scutifoliamide A and scutifoliamide B, respectively. Ten substances isolated from these two plants were assessed for their antifungal activities by thin-layer chromatographic plate method against Cladosporium cladosporioides and C. sphaerospermum; among them, isopiperlongumine demonstrated antifungal activity at a concentration of 0.25 µg . Antifungal amides were also isolated from the Piper plants Piper flaviflorum and Piper sarmentosum, three of which were new, piperflaviflorine A, piperflaviflorine B, and sarmentamide D. Antifungal activity IC50 values for these substances ranged from 4.7 to 20.0 mg/mL .
Many studies have introduced natural substances from Piper species demonstrating antifungal activities, and among them, piperlongumine has been reviewed for several biological activities, especially as an antifungal [20,21,22]. Papers describe antiparasitic activities, including leishmanicidal, trypanocidal, and schistosomicidal activities, among Piper amides. Of these, Leishmania is a type of parasite in the paraphyletic group that enters the body of human or rodent hosts via sandflies. Infection can lead to the development of the difficult-to-treat leishmaniasis.
Leishmanicidal amides isolated from P. longum include piperlongumine, 1-(3,4-methylenedioxyphenyl)-1E tetradecene, piperlongumine A, 2E,4E-N-isobutyl-octadecenamide, piperlongumine B, 2E,4E-N-isobutyl-dodecenamide, 2E,4E,12E,13-(3,4-methylenedioxyphenyl)-tridecatrienoic acid isobutyl amide, and piperine. Among them, piperine has an IC50 value of 3.15 µg/mL, showing strong leishmanicidal effect. This effect was stronger than that of miltefosine (IC50 value, 8.20 µg/mL) used as a positive control . The strong leishmanicidal activity of piperlongumine has been reported in many of the review papers mentioned above , and recently, piperlongumine showed IC50 values against promastigote forms of Leishmania infantum and L. amazonensis of 7.9 and 3.3 μM, respectively. For the amastigote form of L. amazonensis, the IC50 value of piperlongumine was 0.4 μM . Recently, a study was conducted to measure the synergistic effects of piperine and capsaicin with meglumine antimoniate towards promastigote and amastigote stages of Leishmania infantum . These experiments found even stronger EC50 values (4.31 ± 0.44 µg/mL for promastigote form; 7.25 ± 4.84 µg/mL for amastigote form) and the authors recommended combining them with currently used prescription drugs.
Pharmaceutical activities of amides from Piper plants to treat human diseases
Anticancer amides from Piper plants
Piper amides have demonstrated strong cytotoxic effects on many cancer cells, and may be used as primary substances to treat cancer in the future; these will be discussed in detail in this review. In particular, the effects of piperlongumine are unusual, with anticancer properties at low concentrations. Recently, 32 substances with cytotoxic effects among many natural products from Piper plants have been introduced. Of these, 53% were amides, with piperlongumine showing the most potent effects . Piperlongumine anticancer activity in prostate cancer cells included the inhibition of NF-κB activity , leading to the reduction of translocation of p50 and p65 subunits into the nucleus. The expression levels of various cytokines were also affected by increased concentrations of piperlongumine.
Piperlongumine is known for its unique mechanism of action, generating reactive oxygen species (ROS) to kill cancer cells. Among newly synthesized derivatives, CG-6 exhibited the strongest cytotoxic effect on human prostate cancer DU-145 cells via inhibition of the phosphorylation of STAT2 and IL-6-induced STAT3 phosphorylation . Similarly, another study also reported that piperlongumine induces the production of ROS, resulting in autophagy of biliary cancer cells. Induction of ROS by piperlongumine purportedly occurs by activation of the Erk signaling pathway, and has been shown to induce cell cycle arrest in cholangiocarcinoma cells (HuCCT-1) and gallbladder cancer cells (OCUG 1). Piperlongumine also caused G2/M cell cycle arrest in HuCCT 1 cells and G0/G1 cell cycle arrest in OCUG 1 cells . Still another study showed an increase in the sensitivity of colorectal cancer cells in association with changes to ROS homeostasis due to inhibition of glutathione production and thioredoxin function by treatment with piperlongumine .
The main anti-cancer Piper amides are present in P. nigrum. Pellitorine derived from P. nigrum possesses potent cytotoxic activities against the HL60 human promyelocytic leukemia cell line, with an IC50 value of 13.0 µg/mL . Alkaloids from P. nigrum increase the effect of paclitaxel on cervical cancer cell lines that were resistant to this drug by alkaloid down-regulation of Mcl-1 . Piperine combined with paclitaxel decreased Mcl-1 expression by about 30% compared to the control cell lines. The anticancer effect of piperine was further confirmed in a human melanoma cell line, wherein piperine increased the expression of BCL2-associated X, BAX, cleaved ADP-ribose polymerase, and phospho-p38; BCL-2 and ERK1/2 phosphorylation were thereby inhibited . Piperine was found to inhibit human ovarian tumor growth by activating the JNK/p38 MAPK-mediated intrinsic apoptotic pathway . These effects resulted in increased release of cytochrome c into the cytosol and activation of caspase-3 and -9, all of which are apoptotic facilitators.
The combination of piperine with capsaicin was also potent against doxorubicin-resistant cancer cell lines . Further study is needed to explore how to combine piperine with other natural materials to treat cancer cells that have developed resistance to conventional anticancer drugs. Interestingly, piperine-free P. nigrum extracts were prepared to study their effects on N-nitrosomethylurea-induced mammary tumorigenesis in rats . Recently, a review paper was published that collected results from several studies on the anticancer effects of piperine towards cancerous and normal cells .
Antiplatelet activities of Piper amides
Antiplatelet effects by solvent extracts of Piper plants have been suggested, and a study on the antiplatelet mechanisms in these extracts was undertaken to assess their inhibition of prostaglandin and leukotriene biosynthesis via the reduction of 5-lipoxygenase and cyclooxygenase activity . Among them, extracts from Piper boehmeriifolium var. tonkinense possessed the strongest anti-platelet activity; the active compounds in the extracts were identified as pellitorine, piperlongumine, and piperine, among others.
Antiplatelet effects of piperlongumine have been reported by many research groups. Their results indicated that piperlongumine suppressed platelet aggregation in rabbits as a thromboxane A2 receptor antagonist . Another study reported on inhibiting aggregation by treating with piperlongumine after generating platelet aggregation using collagen, arachidonic acid, and platelet-activating factor . The antiplatelet effects of synthesized piperlongumine derivatives were also measured; among these derivatives, 1-(3,5-dimethylpiperidin-1-yl)-3-(3,4,5-trimethoxyphenyl) prop-2-en-1-one was identified as the most potent.
A proteomics study was conducted wherein piperlongumine was administered to collagen-treated, aggregated rabbit platelet cells . After piperlongumine treatment of the platelet cells, the levels of 33 proteins in the aggregated cells decreased, and those of 24 proteins increased. Antithrombogenic effects of piperlongumine were measured using mice after intravenous (IV) injection of a combination of collagen and epinephrine, and protection by piperlongumine was evaluated at 47.9%, 8.6% higher than the aspirin used as a positive control.
Other therapeutic activities of Piper amides
P. chaba contains several amide compounds, and of these, four newly isolated amides (piperchabamides A, B, C, and D) were identified. These four amides, along with other previously identified amides, showed therapeutic effects on ethanol-induced gastric lesions . Anti-inflammatory properties of amides derived from P. ovatum have been reported in croton oil-induced ear edema in mice, using a combinatorial mixture of piperovatine and piperlongumine at doses of 2.5, 1.25, and 0.625 mg/ear; these treatments dramatically controlled levels of ear edema . Another amide of P. longum, methylpiperate, is a potent inhibitor of monoamine oxidase (MAO). MAO exists in two isozymes, and inhibitors for MAO-A have been used as anti-depressants. MAO-B inhibitors have been used in the treatment of Alzheimer’s disease. Methylpiperate exhibited dramatic MAO inhibitory activity, with an IC50 value of 3.6 µM, and demonstrated competitive inhibition against both MAO-A and MAO-B as assessed with Lineweaver–Burk plots . Two other Piper amides (piperlongumine and retrofractamide A) have shown inhibitory effects on histone deacetylase activity, and a hydroxamic acid moiety is needed to show their potent inhibition of HDAC activity .
Other biological activities of piperlongumine include the inhibition of atherosclerotic plaque formation and suppression of the proliferation of vascular smooth muscle cells . These effects on atherosclerosis by piperlongumine are related to its ability to inhibit platelet-derived growth factor BB-induced proliferation, conferring down-regulation of downstream signaling molecules. Studies have also shown that piperlongumine postpones the activation of NF-κB. Another important physiological activity of piperlongumine is as an activator for the phosphorylation of AMP-activated protein kinase . After oral administration, piperlongumine markedly enhanced object recognition and building behavior in aged mice, suggesting therapeutic effects on hippocampal function and cognitive decline . Similarly, liposaccharide (LPS)-induced amyloidogenesis is caused by NF-kB activity. Piperlongumine can inhibit amyloidogenesis by inhibiting NF-κB activity. Evidence also suggests that piperlongumine injections inhibited LPS-induced memory .
These multiple biological effects led to a study undertaking formulations of piperlongumine to prepare it for use as a medicinal therapeutic  (Fig. 2). The solubility of piperlongumine increased 27-fold when 10% polysorbate 80 was used as a surfactant. The solution was unstable at pH 7 and above, but favorably stable at pH 4 and below. Another study confirmed that it takes about 17 weeks to decompose about 10% of the piperlongumine formulation at pH 4 in 25 °C conditions. Finally, piperlongumine formulated into ROS-sensitive nanofibers was found to suppress the growth of cholangiocarcinoma cells .
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This study was supported by Kyungpook National University Research Fund (2017).
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Jeon, HJ., Kim, K., Kim, YD. et al. Naturally occurring Piper plant amides potential in agricultural and pharmaceutical industries: perspectives of piperine and piperlongumine. Appl Biol Chem 62, 63 (2019). https://doi.org/10.1186/s13765-019-0471-z