Safety, efficacy and anti-inflammatory activity of rho iso-alpha-acids from hops

Rho iso-alpha-acids (RIAA) is a modified extract from the flower cone of hops ( Humulus lupulus L.). The safety profile and anti-inflammatory activity of RIAA was assessed using in vitro models and clinical biomarkers. This study suggests that RIAA is an alternative to NSAIDs with an expected reduct...

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Published inPhytochemistry (Oxford) Vol. 69; no. 7; pp. 1534 - 1547
Main Authors Hall, Amy J., Babish, John G., Darland, Gary K., Carroll, Brian J., Konda, Veera Reedy, Lerman, Robert H., Bland, Jeffery S., Tripp, Matthew L.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Ltd 01.05.2008
Elsevier
Subjects
Hop
Online AccessGet full text
ISSN0031-9422
1873-3700
DOI10.1016/j.phytochem.2008.02.001

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Abstract Rho iso-alpha-acids (RIAA) is a modified extract from the flower cone of hops ( Humulus lupulus L.). The safety profile and anti-inflammatory activity of RIAA was assessed using in vitro models and clinical biomarkers. This study suggests that RIAA is an alternative to NSAIDs with an expected reduction in adverse events. A defined mixture of rho iso-alpha-acids (RIAA), a modified hop extract, was evaluated for anti-inflammatory efficacy and safety. RIAA inhibited LPS-stimulated PGE 2 formation with >200-fold selectivity of COX-2 (IC 50 = 1.3 μg/ml) over COX-1 (IC 50 > 289 μg/ml). This occurred only when RIAA was added prior to, but not post, LPS stimulation. Consistent with this observation, RIAA produced no physiologically relevant, direct inhibition of COX-1 or COX-2 peroxidase activity. This suggests that RIAA inhibits inducible but not constitutive COX-2. In support, we found RIAA showed minimal PGE 2 inhibition (IC 50 = 21 μg/ml) relative to celecoxib (IC 50 = 0.024 μg/ml), aspirin (IC 50 = 0.52 μg/ml) or ibuprofen (IC 50 = 0.57 μg/ml) in the AGS gastric mucosal model, where COX-1 and -2 are expressed constitutively. Taken together these results predict RIAA may have lower potential for gastrointestinal and cardiovascular toxicity observed with COX enzyme inhibitors. Following confirmation of bioavailable RIAA administered orally, gastrointestinal safety was assessed using the fecal calprotectin biomarker in a 14-day human clinical study; RIAA (900 mg/day) produced no change compared to naproxen (1000 mg/day), which increased fecal calprotectin 200%. Cardiovascular safety was addressed by PGI-M measurements where RIAA (1000 mg) did not reduce PGI-M or affect the urinary PGI-M/TXB 2 ratio. Drug interaction potential was evaluated against six major CYPs; of relevance, RIAA inhibited CYP2C9. Toxicity was assessed in a 21-day oral, mouse subchronic toxicity study where no dose dependent histopathological effects were noted. Clinically, RIAA (1000 mg/day) produced a 54% reduction in WOMAC Global scores in a 6-week, open-label trial of human subjects exhibiting knee osteoarthritis.
AbstractList A defined mixture of rho iso-alpha-acids (RIAA), a modified hop extract, was evaluated for anti-inflammatory efficacy and safety. RIAA inhibited LPS-stimulated PGE2 formation with >200-fold selectivity of COX-2 (IC50 = 1.3 μg/ml) over COX-1 (IC50 > 289 μg/ml). This occurred only when RIAA was added prior to, but not post, LPS stimulation. Consistent with this observation, RIAA produced no physiologically relevant, direct inhibition of COX-1 or COX-2 peroxidase activity. This suggests that RIAA inhibits inducible but not constitutive COX-2. In support, we found RIAA showed minimal PGE2 inhibition (IC50 = 21 μg/ml) relative to celecoxib (IC50 = 0.024 μg/ml), aspirin (IC50 = 0.52 μg/ml) or ibuprofen (IC50 = 0.57 μg/ml) in the AGS gastric mucosal model, where COX-1 and -2 are expressed constitutively. Taken together these results predict RIAA may have lower potential for gastrointestinal and cardiovascular toxicity observed with COX enzyme inhibitors. Following confirmation of bioavailable RIAA administered orally, gastrointestinal safety was assessed using the fecal calprotectin biomarker in a 14-day human clinical study; RIAA (900 mg/day) produced no change compared to naproxen (1000 mg/day), which increased fecal calprotectin 200%. Cardiovascular safety was addressed by PGI-M measurements where RIAA (1000 mg) did not reduce PGI-M or affect the urinary PGI-M/TXB2 ratio. Drug interaction potential was evaluated against six major CYPs; of relevance, RIAA inhibited CYP2C9. Toxicity was assessed in a 21-day oral, mouse subchronic toxicity study where no dose dependent histopathological effects were noted. Clinically, RIAA (1000 mg/day) produced a 54% reduction in WOMAC Global scores in a 6-week, open-label trial of human subjects exhibiting knee osteoarthritis.
Rho iso-alpha-acids (RIAA) is a modified extract from the flower cone of hops ( Humulus lupulus L.). The safety profile and anti-inflammatory activity of RIAA was assessed using in vitro models and clinical biomarkers. This study suggests that RIAA is an alternative to NSAIDs with an expected reduction in adverse events. A defined mixture of rho iso-alpha-acids (RIAA), a modified hop extract, was evaluated for anti-inflammatory efficacy and safety. RIAA inhibited LPS-stimulated PGE 2 formation with >200-fold selectivity of COX-2 (IC 50 = 1.3 μg/ml) over COX-1 (IC 50 > 289 μg/ml). This occurred only when RIAA was added prior to, but not post, LPS stimulation. Consistent with this observation, RIAA produced no physiologically relevant, direct inhibition of COX-1 or COX-2 peroxidase activity. This suggests that RIAA inhibits inducible but not constitutive COX-2. In support, we found RIAA showed minimal PGE 2 inhibition (IC 50 = 21 μg/ml) relative to celecoxib (IC 50 = 0.024 μg/ml), aspirin (IC 50 = 0.52 μg/ml) or ibuprofen (IC 50 = 0.57 μg/ml) in the AGS gastric mucosal model, where COX-1 and -2 are expressed constitutively. Taken together these results predict RIAA may have lower potential for gastrointestinal and cardiovascular toxicity observed with COX enzyme inhibitors. Following confirmation of bioavailable RIAA administered orally, gastrointestinal safety was assessed using the fecal calprotectin biomarker in a 14-day human clinical study; RIAA (900 mg/day) produced no change compared to naproxen (1000 mg/day), which increased fecal calprotectin 200%. Cardiovascular safety was addressed by PGI-M measurements where RIAA (1000 mg) did not reduce PGI-M or affect the urinary PGI-M/TXB 2 ratio. Drug interaction potential was evaluated against six major CYPs; of relevance, RIAA inhibited CYP2C9. Toxicity was assessed in a 21-day oral, mouse subchronic toxicity study where no dose dependent histopathological effects were noted. Clinically, RIAA (1000 mg/day) produced a 54% reduction in WOMAC Global scores in a 6-week, open-label trial of human subjects exhibiting knee osteoarthritis.
A defined mixture of rho iso-alpha-acids (RIAA), a modified hop extract, was evaluated for anti-inflammatory efficacy and safety. RIAA inhibited LPS-stimulated PGE(2) formation with >200-fold selectivity of COX-2 (IC(50)=1.3 microg/ml) over COX-1 (IC(50)>289 microg/ml). This occurred only when RIAA was added prior to, but not post, LPS stimulation. Consistent with this observation, RIAA produced no physiologically relevant, direct inhibition of COX-1 or COX-2 peroxidase activity. This suggests that RIAA inhibits inducible but not constitutive COX-2. In support, we found RIAA showed minimal PGE(2) inhibition (IC(50)=21mug/ml) relative to celecoxib (IC(50)=0.024 microg/ml), aspirin (IC(50)=0.52 microg/ml) or ibuprofen (IC(50)=0.57 microg/ml) in the AGS gastric mucosal model, where COX-1 and -2 are expressed constitutively. Taken together these results predict RIAA may have lower potential for gastrointestinal and cardiovascular toxicity observed with COX enzyme inhibitors. Following confirmation of bioavailable RIAA administered orally, gastrointestinal safety was assessed using the fecal calprotectin biomarker in a 14-day human clinical study; RIAA (900 mg/day) produced no change compared to naproxen (1000 mg/day), which increased fecal calprotectin 200%. Cardiovascular safety was addressed by PGI-M measurements where RIAA (1000 mg) did not reduce PGI-M or affect the urinary PGI-M/TXB(2) ratio. Drug interaction potential was evaluated against six major CYPs; of relevance, RIAA inhibited CYP2C9. Toxicity was assessed in a 21-day oral, mouse subchronic toxicity study where no dose dependent histopathological effects were noted. Clinically, RIAA (1000 mg/day) produced a 54% reduction in WOMAC Global scores in a 6-week, open-label trial of human subjects exhibiting knee osteoarthritis.
A defined mixture of rho iso-alpha-acids (RIAA), a modified hop extract, was evaluated for anti-inflammatory efficacy and safety. RIAA inhibited LPS-stimulated PGE(2) formation with >200-fold selectivity of COX-2 (IC(50)=1.3 microg/ml) over COX-1 (IC(50)>289 microg/ml). This occurred only when RIAA was added prior to, but not post, LPS stimulation. Consistent with this observation, RIAA produced no physiologically relevant, direct inhibition of COX-1 or COX-2 peroxidase activity. This suggests that RIAA inhibits inducible but not constitutive COX-2. In support, we found RIAA showed minimal PGE(2) inhibition (IC(50)=21mug/ml) relative to celecoxib (IC(50)=0.024 microg/ml), aspirin (IC(50)=0.52 microg/ml) or ibuprofen (IC(50)=0.57 microg/ml) in the AGS gastric mucosal model, where COX-1 and -2 are expressed constitutively. Taken together these results predict RIAA may have lower potential for gastrointestinal and cardiovascular toxicity observed with COX enzyme inhibitors. Following confirmation of bioavailable RIAA administered orally, gastrointestinal safety was assessed using the fecal calprotectin biomarker in a 14-day human clinical study; RIAA (900 mg/day) produced no change compared to naproxen (1000 mg/day), which increased fecal calprotectin 200%. Cardiovascular safety was addressed by PGI-M measurements where RIAA (1000 mg) did not reduce PGI-M or affect the urinary PGI-M/TXB(2) ratio. Drug interaction potential was evaluated against six major CYPs; of relevance, RIAA inhibited CYP2C9. Toxicity was assessed in a 21-day oral, mouse subchronic toxicity study where no dose dependent histopathological effects were noted. Clinically, RIAA (1000 mg/day) produced a 54% reduction in WOMAC Global scores in a 6-week, open-label trial of human subjects exhibiting knee osteoarthritis.A defined mixture of rho iso-alpha-acids (RIAA), a modified hop extract, was evaluated for anti-inflammatory efficacy and safety. RIAA inhibited LPS-stimulated PGE(2) formation with >200-fold selectivity of COX-2 (IC(50)=1.3 microg/ml) over COX-1 (IC(50)>289 microg/ml). This occurred only when RIAA was added prior to, but not post, LPS stimulation. Consistent with this observation, RIAA produced no physiologically relevant, direct inhibition of COX-1 or COX-2 peroxidase activity. This suggests that RIAA inhibits inducible but not constitutive COX-2. In support, we found RIAA showed minimal PGE(2) inhibition (IC(50)=21mug/ml) relative to celecoxib (IC(50)=0.024 microg/ml), aspirin (IC(50)=0.52 microg/ml) or ibuprofen (IC(50)=0.57 microg/ml) in the AGS gastric mucosal model, where COX-1 and -2 are expressed constitutively. Taken together these results predict RIAA may have lower potential for gastrointestinal and cardiovascular toxicity observed with COX enzyme inhibitors. Following confirmation of bioavailable RIAA administered orally, gastrointestinal safety was assessed using the fecal calprotectin biomarker in a 14-day human clinical study; RIAA (900 mg/day) produced no change compared to naproxen (1000 mg/day), which increased fecal calprotectin 200%. Cardiovascular safety was addressed by PGI-M measurements where RIAA (1000 mg) did not reduce PGI-M or affect the urinary PGI-M/TXB(2) ratio. Drug interaction potential was evaluated against six major CYPs; of relevance, RIAA inhibited CYP2C9. Toxicity was assessed in a 21-day oral, mouse subchronic toxicity study where no dose dependent histopathological effects were noted. Clinically, RIAA (1000 mg/day) produced a 54% reduction in WOMAC Global scores in a 6-week, open-label trial of human subjects exhibiting knee osteoarthritis.
Author Hall, Amy J.
Babish, John G.
Tripp, Matthew L.
Carroll, Brian J.
Lerman, Robert H.
Darland, Gary K.
Konda, Veera Reedy
Bland, Jeffery S.
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IsPeerReviewed true
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Issue 7
Keywords Cyclooxygenase
Humulus lupulus L
Knee osteoarthritis
Prostaglandin
Rho iso-alpha-acids
NSAID
Hops
PGE 2
Cannabidaceae
Calprotectin
Anti-inflammatory
Prostaglandin-endoperoxide synthase
Toxicity
Stimulation
Reduction
Dicotyledones
Angiospermae
Peroxidase
Inhibition
Human
PGE2
Enzyme
Interaction
Rodentia
Antiinflammatory agent
Hop
Enzyme inhibitor
Vertebrata
Mammalia
Peroxidases
Mouse
Spermatophyta
Models
Oxidoreductases
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Snippet Rho iso-alpha-acids (RIAA) is a modified extract from the flower cone of hops ( Humulus lupulus L.). The safety profile and anti-inflammatory activity of RIAA...
A defined mixture of rho iso-alpha-acids (RIAA), a modified hop extract, was evaluated for anti-inflammatory efficacy and safety. RIAA inhibited LPS-stimulated...
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SubjectTerms Adult
adverse effects
Aged
Alkanes
Alkanes - adverse effects
Alkanes - pharmacokinetics
Alkanes - therapeutic use
Animals
Anti-inflammatory
anti-inflammatory activity
Anti-Inflammatory Agents
Anti-Inflammatory Agents - adverse effects
Anti-Inflammatory Agents - pharmacokinetics
Anti-Inflammatory Agents - therapeutic use
Biological and medical sciences
Biological Availability
blood chemistry
blood pressure
Body Weight
Body Weight - drug effects
Calprotectin
Cannabidaceae
Cell Line
Chemical constitution
chemistry
Chromatography, Liquid
cultured cells
Cyclooxygenase
Cyclooxygenase Inhibitors
Cyclooxygenase Inhibitors - adverse effects
Cyclooxygenase Inhibitors - pharmacokinetics
Cyclooxygenase Inhibitors - therapeutic use
Cyclopentanes
Cyclopentanes - adverse effects
Cyclopentanes - pharmacokinetics
Cyclopentanes - therapeutic use
drug effects
enzyme activity
Feces
Feces - chemistry
Female
Fundamental and applied biological sciences. Psychology
General pharmacology
Hops
Humans
Humulus
Humulus - chemistry
Humulus lupulus
Humulus lupulus L
Kidney
Kidney - drug effects
Kidney - pathology
Knee osteoarthritis
Leukocyte L1 Antigen Complex
Leukocyte L1 Antigen Complex - metabolism
Liver
Liver - drug effects
Liver - pathology
Male
Mass Spectrometry
Medical sciences
metabolism
Mice
Middle Aged
NSAID
Organ Size
Organ Size - drug effects
osteoarthritis
Osteoarthritis - pathology
Osteoarthritis - prevention & control
pathology
PGE 2
Pharmacognosy. Homeopathy. Health food
pharmacokinetics
Pharmacology. Drug treatments
phytochemicals
Plant Extracts
Plant Extracts - adverse effects
Plant Extracts - pharmacokinetics
Plant Extracts - therapeutic use
Plant physiology and development
prevention & control
Prostaglandin
prostaglandin synthase
prostaglandins
Prostaglandins - urine
Rho iso-alpha-acids
therapeutic use
Treatment Outcome
urine
Title Safety, efficacy and anti-inflammatory activity of rho iso-alpha-acids from hops
URI https://dx.doi.org/10.1016/j.phytochem.2008.02.001
https://www.ncbi.nlm.nih.gov/pubmed/18358504
https://www.proquest.com/docview/47697629
https://www.proquest.com/docview/69129943
Volume 69
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