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Bolton JL, Dunlap TL, Hajirahimkhan A, Mbachu O, Chen SN, Chadwick L, Nikolic D, van Breemen RB, Pauli GF, Dietz BM. The Multiple Biological Targets of Hops and Bioactive Compounds. Chem Res Toxicol 2019; 32:222-233. [PMID: 30608650 PMCID: PMC6643004 DOI: 10.1021/acs.chemrestox.8b00345] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Botanical dietary supplements for women's health are increasingly popular. Older women tend to take botanical supplements such as hops as natural alternatives to traditional hormone therapy to relieve menopausal symptoms. Especially extracts from spent hops, the plant material remaining after beer brewing, are enriched in bioactive prenylated flavonoids that correlate with the health benefits of the plant. The chalcone xanthohumol (XH) is the major prenylated flavonoid in spent hops. Other less abundant but important bioactive prenylated flavonoids are isoxanthohumol (IX), 8-prenylnaringenin (8-PN), and 6-prenylnaringenin (6-PN). Pharmacokinetic studies revealed that these flavonoids are conjugated rapidly with glucuronic acid. XH also undergoes phase I metabolism in vivo to form IX, 8-PN, and 6-PN. Several hop constituents are responsible for distinct effects linked to multiple biological targets, including hormonal, metabolic, inflammatory, and epigenetic pathways. 8-PN is one of the most potent phytoestrogens and is responsible for hops' estrogenic activities. Hops also inhibit aromatase activity, which is linked to 8-PN. The weak electrophile, XH, can activate the Keap1-Nrf2 pathway and turn on the synthesis of detoxification enzymes such as NAD(P)H-quinone oxidoreductase 1 and glutathione S-transferase. XH also alkylates IKK and NF-κB, resulting in anti-inflammatory activity. Antiobesity activities have been described for XH and XH-rich hop extracts likely through activation of AMP-activated protein kinase signaling pathways. Hop extracts modulate the estrogen chemical carcinogenesis pathway by enhancing P450 1A1 detoxification. The mechanism appears to involve activation of the aryl hydrocarbon receptor (AhR) by the AhR agonist, 6-PN, leading to degradation of the estrogen receptor. Finally, prenylated phenols from hops are known inhibitors of P450 1A1/2; P450 1B1; and P450 2C8, 2C9, and 2C19. Understanding the biological targets of hop dietary supplements and their phytoconstituents will ultimately lead to standardized botanical products with higher efficacy, safety, and chemopreventive properties.
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Affiliation(s)
- Judy L. Bolton
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Tareisha L. Dunlap
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Atieh Hajirahimkhan
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Obinna Mbachu
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Shao-Nong Chen
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
- Center for Natural Product Technologies, Department of Medicinal Chemistry and Pharmacognosy (M/C 781), College of Pharmacy, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Luke Chadwick
- Bell’s Brewery, 8938 Krum Avenue, Galesburg, Michigan 49053, United States
| | - Dejan Nikolic
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Richard B. van Breemen
- Linus Pauling Institute, Oregon State University, 305 Linus Pauling Science Center, Corvallis, Oregon 97331, United States
| | - Guido F. Pauli
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
- Center for Natural Product Technologies, Department of Medicinal Chemistry and Pharmacognosy (M/C 781), College of Pharmacy, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Birgit M. Dietz
- UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois at Chicago, 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
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Hajirahimkhan A, Mbachu O, Simmler C, Ellis SG, Dong H, Nikolic D, Lankin DC, van Breemen RB, Chen SN, Pauli GF, Dietz BM, Bolton JL. Estrogen Receptor (ER) Subtype Selectivity Identifies 8-Prenylapigenin as an ERβ Agonist from Glycyrrhiza inflata and Highlights the Importance of Chemical and Biological Authentication. J Nat Prod 2018; 81:966-975. [PMID: 29641206 PMCID: PMC5928484 DOI: 10.1021/acs.jnatprod.7b01070] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Postmenopausal women are increasingly using botanicals for menopausal symptom relief due to the increased breast cancer risk associated with traditional estrogen therapy. The deleterious effects of estrogens are associated with estrogen receptor (ER)α-dependent proliferation, while ERβ activation could enhance safety by opposing ERα effects. Three medicinal licorice species, Glycyrrhiza glabra ( G. glabra), G. uralensis, and G. inflata, were studied for their differential estrogenic efficacy. The data showed higher estrogenic potency for G. inflata in an alkaline phosphatase induction assay in Ishikawa cells (ERα) and an estrogen responsive element (ERE)-luciferase assay in MDA-MB-231/β41 breast cancer cells (ERβ). Bioassay-guided fractionation of G. inflata led to the isolation of 8-prenylapigenin (3). Surprisingly, a commercial batch of 3 was devoid of estrogenic activity. Quality control by MS and qNMR revealed an incorrect compound, 4'- O-methylbroussochalcone B (10), illustrating the importance of both structural and purity verification prior to any biological investigations. Authentic and pure 3 displayed 14-fold preferential ERβ agonist activity. Quantitative analyses revealed that 3 was 33 times more concentrated in G. inflata compared to the other medicinal licorice extracts. These data suggest that standardization of G. inflata to 3 might enhance the safety and efficacy of G. inflata supplements used for postmenopausal women's health.
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Affiliation(s)
- Atieh Hajirahimkhan
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Obinna Mbachu
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Charlotte Simmler
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Sarah G. Ellis
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Huali Dong
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Dejan Nikolic
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - David C. Lankin
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Richard B. van Breemen
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Shao-Nong Chen
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Guido F. Pauli
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Birgit M. Dietz
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
| | - Judy L. Bolton
- UIC/NIH
Center for Botanical Dietary Supplements Research and Center for Natural
Product Technologies (CENAPT), Department of Medicinal Chemistry and
Pharmacognosy, College of Pharmacy, M/C 781, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231, United States
- E-mail (J. L. Bolton): . Tel: +1 (312) 996-5280. Fax: +1 (312) 996-7107
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Puppala B, Awan I, Briyal S, Mbachu O, Leonard M, Gulati A. Ontogeny of endothelin receptors in the brain, heart, and kidneys of neonatal rats. Brain Dev 2015; 37:206-15. [PMID: 24815227 DOI: 10.1016/j.braindev.2014.04.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 04/16/2014] [Accepted: 04/17/2014] [Indexed: 01/15/2023]
Abstract
BACKGROUND Endothelin (ET) plays an important role in many physiological functions. It has been demonstrated that endogenous ET-1 concentration in the central nervous system (CNS) changes with age; however the ontogeny of ETA and ETB receptors in the brain, heart, and kidneys during postnatal development has not been studied. METHODS Brains, hearts and kidneys of rats at postnatal days 1, 7, 14 and 28 were evaluated for the expression of ETA and ETB receptors via Western blot. ETB receptors within the developing brain were further accessed via immunofluorescence. RESULTS The mean organ and body weights increased proportionally with advancing age demonstrating normal growth. The expression of ETA receptors in the brain, heart, and kidneys and ETB receptor expression in the heart and kidneys was similar in these rats at postnatal ages 1, 7, 14 and 28days. However, brain ETB receptor expression significantly (P<0.001) decreased by 72% on day 28 compared to the levels on postnatal day 1. Upon immunofluorescent analysis, the intensity of ETB staining in the cerebral cortex and subventricular zones of the developing rat brain decreased significantly from day 1 to day 7 (P<0.001) and from day 7 to day 14 (P<0.0001). There was no further decrease in ETB intensity noted in the cerebral cortex and subventricular zones between day 14 and day 28 of postnatal age. The intensity of ETB receptor staining within the cerebrovasculature, on the other hand, increased significantly (P<0.05) from days 1 and 7 to day 14. CONCLUSIONS These results demonstrate that expression of ETA receptors does not change with postnatal development. On the other hand ETB receptors in the cerebral cortex and subventricular zones of the brain decrease with age, while ETB receptors in the cerebrovasculature increase with age, implicating ETB receptor involvement in the structural maturity and development of the CNS.
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Affiliation(s)
- Bhagya Puppala
- Department of Pediatrics, Division of Neonatology, Advocate Lutheran General Children's Hospital, Park Ridge, IL, USA; Advocate Medical Group, Park Ridge, IL, USA.
| | - Imran Awan
- Department of Pediatrics, Division of Neonatology, Advocate Lutheran General Children's Hospital, Park Ridge, IL, USA.
| | - Seema Briyal
- Department of Pharmaceutical Sciences, Midwestern University Chicago College of Pharmacy, Downers Grove, IL, USA.
| | - Obinna Mbachu
- Department of Pharmaceutical Sciences, Midwestern University Chicago College of Pharmacy, Downers Grove, IL, USA.
| | - Mary Leonard
- Department of Pharmaceutical Sciences, Midwestern University Chicago College of Pharmacy, Downers Grove, IL, USA.
| | - Anil Gulati
- Department of Pharmaceutical Sciences, Midwestern University Chicago College of Pharmacy, Downers Grove, IL, USA.
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