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Contribution of GutMicrobiota to Hypertension
汇报人:优品PPT
Fresh business general templateApplicable to enterprise introduction, summary report, sales marketing, chart data
Leung Ho Hin, 1st Year MPhilSupervisor: Prof. Yeoh Yun KitJoint Graduate Student Seminar11/12/19
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CONTENT 02Please add the title hereHow gut microbiotaaffects BP
03Please add the title here
Probioticstherapy
04Please add the title hereSummary
01 Background of HTN
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What is Hypertension?
• Blood pressure (BP): Pressure exerted on the walls of blood vessels as the heart pumps
• Hypertension (HTN): BP too high• Silent Killer: no warning signs or symptoms• Severe Symptom: fatigue, nausea, vomiting, confusion, anxiety, chest pain, and muscle tremors
• Hypertension is a major cause of premature death worldwide
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How common is HTN?
• Very common among HK adult
• Not many realize they have HTN
• In 2012, about 1 in 3 adults in Hong Kong has hypertension
• Half of them did not know about it
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Risk Factor Hypertension CardiovascularDisease
Background
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Risk Factor for HTN
• Modifiable Risk Factor:• Unhealthy diets (excessive salt consumption, a diet high in saturated fat and trans fats, low intake of fruits and vegetables)
• Physical inactivity • Consumption of tobacco and alcohol
• Being overweight or obese
• Non‐modifiable Risk Factor:• include a family history of hypertension
• age over 65 years• co‐existing diseases : Diabetes or kidney disease
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Risk Factor Hypertension CardiovascularDisease
Background
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Alteration of bacteria abundance
HealthyHealthy pHTNpHTN HTNHTN
16S rRNA gene sequencing16S rRNA gene sequencing
China41 healthy56 pHTN99HTN
China60 HTN
60 healthy(gender-, age-, and body weight-matched )
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Alteration of bacteria abundance
PrevotellaPrevotella
KlebsiellaKlebsiella
ActinomycesActinomyces
PorphyromonasPorphyromonas
BacteroidesBacteroides
FaecalibacteriumFaecalibacterium
OscillibacterOscillibacter
ButyrivibrioButyrivibrio
RoseburiaRoseburia
BifidobacteriumBifidobacterium
CoprococcusCoprococcus
HTNHTN HealthyHealthy
ClostridiumClostridium
StreptococcusStreptococcus ParabacteroidesParabacteroides
EggerthellaEggerthella SalmonellaSalmonella
SynergistetesSynergistetes
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Alteration of bacteria abundance
HealthyHealthy
Gut MicrobiomeGut Microbiome
HypertensionHypertension
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Risk Factor
Gut Microbiome
Hypertension CardiovascularDisease
Alteration of bacteria abundance
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How could Gut Microbiome alter BP?
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How could Gut Microbiome alter BP?
1. Metabolite
2. Low‐grade Inflammation
3. Hormones
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1. Metabolite from Gut Microbiota
Short Chain Fatty Acid (SCFA)Short Chain Fatty Acid (SCFA)
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Short Chain Fatty Acid (SCFA)
• Produced by gut microbiota as fermentation products• Most abundant metabolites in gut
• Olfr78 is a receptor for SCFAs— acetate & propionate
• responsible for mediating the secretion of renin• Rate‐limiting step in the renin‐angiotensin‐aldosterone pathway• Lead to formation of angiotensin II, a potent vasoconstrictor
Increase body fluid volume and blood pressure
Jen Pluznick. 2015
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Office4 Renin hormoneMicrosoft Office User, 11/12/2019
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Nitric Oxide (NO)
• Nitric oxide (NO)• Important signaling molecule1. Regulation of regional blood flow 2. smooth muscle relaxation3. secretory and immunological
regulation in the GI tract• Produced through oxidation of L‐arginine by NO synthase• NO is a well‐established vasodilator
Junli Ma and Houkai Li. 2018
Office6
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Nitric Oxide (NO)
• Dysbiosis can promote expression of pro‐inflammatory cytokines & induce oxidative stress
stimulate oxidation of LDL• Ox‐LDL (Oxidized Low‐DensityLipoprotein)
inhibiting the production of NO
• Ox‐LDL decreases the production of NO and reduces the degree of vasodilation• Gut dysbiosis contributes to HTN through vasoconstriction mediated by oxidation of LDL(Ox‐LDL)
Junli Ma and Houkai Li. 2018
cytokines
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2. Low-grade Inflammation
Petra Louis et el. 2014
Gut epithelium
Tight junction protein
systemic & tissue‐specific inflammation
Gut dysbiosis
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Low‐grade Inflammation
• Activated T cells enter the kidney and vasculature• T cell–derived signals (IL‐17) promote entry of other inflammatory cells (macrophages)
Release cytokinescause vasoconstrictionpromote sodium and water absorption
severe hypertension.
David. G. Harrison et el. 2010
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3. Hormones
• Gut microbiota influence production of various hormones
serotoninserotonin
dopaminedopamine
norepinephrinenorepinephrine
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Serotonin(5‐HT)
Tryptophan + tryptophan hydroxylaseForm 5‐hydroxytryptamine (5‐HT), or serotonin
Neurotransmitter/hormone‐Produced in the intestines and the brain‐Also present in blood platelets & central nervous system (CNS)
Important chemical and neurotransmitter in the human body
Help regulate mood and social behavior, appetite and digestion, sleep, memory, and sexual desire and function
Office7
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Office7 Larger fond sizeMicrosoft Office User, 11/12/2019
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William H Frishman and Pam Grewall . 2000
Serotonin
Increase BP
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Serotonin
Jessica M. Yano et el. 2014
deoxycholate
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Probiotics Therapy
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What isProbiotics?
‐Live bacteria and yeasts
‐ good for you, especially your digestive system
‐keep your gut healthy
Probiotics in supplements & foods, like yogurt
Dr.s often suggest them to help digestive problems
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Probiotics Therapy
• Probiotics are widely studied in medical application to prevent or treat many diseases
• such as rheumatism arthritis, diabetes, obesity, allergies and asthma
• Therapeutic effects of probiotics on HTN have also been confirmed in animal and humans
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Probiotics Therapy
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Probiotics Therapy
Lactobacilli‐ Enhance release of anti‐inflammatory factors‐ Protect against invasion of pathogenic bacteria
‐ Competition & lactic acid produced
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Probiotics Therapy
Randomized
placebo‐controlled study
Lactobacillus helveticus LBK‐16H fermented milk containing bioactive peptides in normal daily use has a blood pressure‐lowering effect in HTN subjects
It has been suggested that the mechanism of the antihypertensive effect of these tripeptides may at least, in part, be the inhibition of the angiotensin‐converting enzyme (ACE)
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Probiotics Therapy
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Probiotics Therapy
• Recombinant L. plantarum(model of spontaneously hypertensive rats (SHRs)
• Expressing angiotensin converting enzyme inhibitory peptide (ACEIP) significantly decreased systolic blood in the model of spontaneously hypertensive rats (SHR)
• Maintenance of the gut microbiota balance
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Probiotics Therapy
VSL#3 (Streptococcus thermophilus, B. longum, B. breve, B. infantis, L. acidophilus, L. plantarum, L. casei, L. bulgaricus)
Office9
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Office9
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Office9
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Summary:1. There is relationship between gutmicrobiota and HTN
2.Gut microbiota have potentialmechanism to alter BP
3. Probiotics therapy improve HTN bymodulating gut microbiota
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Thank you