- an essential trace element
DESCRIPTION
- an essential trace element. Basics. What is selenium?. discoverer: Berzelius (1817) occurrence in the earth‘s crust: 0.05 ppm nonmetal (chalcogen) close chemical relationship with sulphur fields of application: semi-conductor technology/photo technique, medicine - PowerPoint PPT PresentationTRANSCRIPT
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- an essential
trace element
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Basics
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What is selenium?
discoverer: Berzelius (1817) occurrence in the earth‘s crust: 0.05 ppm nonmetal (chalcogen) close chemical relationship with sulphur fields of application:
semi-conductor technology/photo technique, medicine essential trace element for humans and animals,
possibly for plants as well
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Close chemical relationship
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Sodium selenite =
Na2SeO3 • 5 H2O
an inorganic salt of selenium
so-called sodium salt of selenous acid(as pentahydrate)
Important inorganic selenium compounds
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Selenium intake
Selenium
Selenium
Selenium
Selenium
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Selenium intake in Europe
SCF (2000): Opinion of the scientific committee on food on the tolerable intake level of selenium. SCF/CS/NUT/UPPLEV/25 final
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Selenium intake in Europe
Rayman MP (2000):The importance of selenium to human health. Lancet Vol 356, 233-241
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Occurrence of selenium
inorganic 1. in traces in sulfides:iron pyrites FeS2
chalcopyrites CuFeS2
zinc blende ZnS2. in rare minerals3. technical: lead chamber slurry
(1817 Berzelius)4. drinking water (selenite, selenate;
e.g. < 2 µg/l)
organic 1. protein-bound:vegetable: predominantly as SeMetanimal: predominantly as SeCys
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Daily kidney?
(circa data on selenium in µg/100g)
Meat, fish ca. (µg):liver (beef) 21filet (beef) 35trout 25herring 43kidney (beef) 112
Milk, eggs, milk products cow‘s milk 1Camembert, 45% F.i.d.m. 3
Fruit banana 1grape 2
Vegetable ca. (µg):brussels sprouts 1boletus 184
Bread, bakery products rye bread 3pasta (containing eggs) 20
Grain rye 1wheat bran 2oat flakes 10
Elmadfa, Muskat, Fritzsche, (2004/05): Die große GU-Nährwertkalorientabelle, Neuausgabe
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Selenium supply in Germany
Medium daily selenium intake:
30 µg/day 41 µg/day
suboptimal supply: Ø 0.67 µg/kg body weight
VERA-study: Selenium serum concentrations
83 µg/l 82 µg/l
max. activity GPX: 95 µg/l
lowest cancer incidence: > 121 µg/l
optimum intake: 1.5 µg/kg body weight
Source: DAZ Nr. 11, 2005
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Recommendations of the DGE (German Society for Nutrition)
Source: Deutsche Gesellschaft für Ernährung e. V.: "Selen - Schätzwerte für eine angemessene Zufuhr“ , 2000.
Age Selenium µg/day
infants 0 to 4 months 5 - 154 to 12 months 7 - 30
children 1 to 4 years 10 - 404 to 7 years 15 - 457 to 10 years 20 - 5010 to 15 years 25 - 60
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Recommendations of the DGE (German Society for Nutrition)
Source: Deutsche Gesellschaft für Ernährung e. V.: "Selen - Schätzwerte für eine angemessene Zufuhr“ , 2000.
Age Selenium µg/day
adolescents 15 to 65 years 30 - 70+ adults
pregnancy 30 - 70lactation 30 - 70
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Toxicology
Source: SCF, (2000): Opinion of the scientific committee on food on the tolerable intake level of selenium. SCF/CS/NUT/UPPLEV/25 Final
“Lowest observed adverse effect level”1200 µgselenium / day
LOAEL
850 µgselenium / day
NOAEL“No observable adverse effect level”
300 µgselenium / day
UL“Tolerable upper intake level”
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Safe total daily intake
Source: SCF, (2000): Opinion of the scientific committee on food on the tolerable intake level of selenium. SCF/CS/NUT/UPPLEV/25 Final
Safe total daily intake according to age groups
“Tolerable upper intake level”
Age group UL (Tolerable upper intake level)
1 - 3 years 60 µg selenium / day 4 - 6 years 90 µg selenium / day 7 - 12 years 130 µg selenium / day
13 - 14 years 200 µg selenium / day 15 - 17 years 250 µg selenium / day
adults 300 µg selenium / day
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Selenium metabolism
Modified according to: Windisch, Gabler, Kirchgeßner, (1997): Umwelttoxikologie (VO 910.305) Systemkomponente “Tier”: Selen WS (2004/05)
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How does selenium reach the protein?
Modified according to: Windisch, Gabler, Kirchgeßner, (1997): Umwelttoxikologie (VO 910.305) Systemkomponente “Tier”: Selen WS (2004/05)
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Distribution of selenium in the body
Source: Biesalski HK, Köhrle J, Schümann K, (2002): Vitamine, Spurenelemente und Mineralstoffe. Prävention und Therapie mit Mikronährstoffen. Georg Thieme Verlag, Stuttgart
Selenium content of human organs and body fluids:
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Selenium deficiency situations
Possible reasons of an absolute or relative selenium deficiency
reduced selenium supply disturbed selenium intake increased selenium losses increased selenium demand increased endogenous strain with radicals and
peroxides increased exogenous strain with noxa
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Reduced selenium supply
nutritional conditions and habits - extremely unbalanced nutrition- vegetarians- vegans
parenteral nutrition diets
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Disturbed selenium intake
gastro-intestinal diseases maldigestion, malabsorption,
celiac disease
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Increased selenium demand
pregnancy lactation high physical strain or stress elder persons immune deficiency
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Increased selenium demand
chronical destructive diseases, above all tumour diseases
rheumatism-related diseases (arthritis, arthroses)
cardiovascular diseases (coronary heart disease, cardiomyopathy, atherosclerosis)
inflammatory diseases of the gastro-intestinal tract (pancreatitis, Crohn‘s disease, ulcerative colitis)
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Increased exogenous strain with noxa
workplace heavy metals (e.g. amalgam) chemotherapy radiotherapy alcohol, nicotine
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Diagnosis of the selenium status
The determination from the whole bloodhas been proven for the measurement of the selenium level.
Hair isn‘t that suitable as examination material as it‘s not actively involved inthe metabolism.
Special laboratories measure theselenium content as a matter of routine and relatively low-priced.
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Selenium status
Recommendations for laboratory analysis (Germany)
Serum: Short-term parameterdeficient < 65 μg/l = < 0.81 μmol/lnormal 50 - 120 μg/l = 0.81 - 1.25 μmol/loptimal 101 - 135 μg/l = 1.26 - 1.71 μmol/l
Whole blood: Long-term parameterdeficient < 85 μg/l = < 1.06 μmol/lnormal 60 - 120 μg/l = 1.06 - 1.50 μmol/loptimal 121 - 162 μg/l = 1.51 - 2.05 μmol/l
Source: Gröber U, (2003): Selen. OM. Z. f. Orthomolekulare Medizin 4, 25-26
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1973 - 2002 Selenoproteins with known enzymatic function:glutathione peroxidasethioredoxin reductasedeiodase
Modified according to: Schomburg L, Schweizer U, Köhrle J, (2005): Selen und Selenoproteine. Humboldt Spektrum 3, 12-18
2003 Selenogenome:human: 25 genesrodent: 24 genesdrosophila: 4 genesC. elegans: 1 gene
2005 Selenoproteome: 30 - 70 forms
State of selenoprotein research
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Selenoproteins:Proteins, specifically containing selenocysteine
Enzymes glutathione peroxidasethioredoxin reductasedeiodaseselenophosphate synthetase 2
Selenium-binding selenoprotein Pprotein
Proteins with still selenoprotein Wunexplained function several other selenoproteins
Selenium-containing proteins in humans
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Proteins, containing non-specifically integrated selenium
muscle proteinsglobinother tissue proteins
Selenium-containing proteins in humans
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1973 identified as selenoprotein
contains 4 Se-atoms, bound as selenocysteine
in the active centre
can be found everywhere in the organism
catalytic activity: reduction of peroxides
Glutathione peroxidase
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Origin and effect of radicalsUV-
radiationinflammations (phago-cytosis, PG-synthesis)
X-rays metabolic processes
elimination of foreign substances
O2-transport (Hb)
reper-fusion
damage of cell membraneDNA damage
protein cross-linkingcell destruction
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Peroxide detoxification by glutathione peroxidase
GSH = reduced glutathioneGSSG = oxidised glutathioneE = enzyme
Glutathione peroxidase
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Function
protect the organism from the toxicity of endogenous and exogenous peroxides
Glutathione peroxidases
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Selenium deficiency decrease in enzyme activity
oxidative destruction of biomolecules, cells and tissues
involved in numerous human diseases and disorders where radicals have either a primary or secondary role, such as e.g.
atherosclerosis cardiomyopathy amyotrophic lateral sclerosis rheumatism infertility cancer
Glutathione peroxidases
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Function
activation (T4 to T3) and deactivation (T4 to rT3) of thethyroid hormones
provide appropriate levels of thyroid hormonesessential for growth, differentiation and metabolism
Deiodases
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Selenium deficiency decrease in enzyme activity
suboptimal (type-I and type-II-5’-deiodases) or supraoptimal levels of active T3 (type-III-5-deiodase)
plays a role in various diseases, such as e.g. Hashimoto‘s thyroiditis H2O2-dependent destruction of thyroid due to
continuous stimulation by TSH disorders in fetal brain development
Deiodases
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Function
play a decisive role in regulation of transcription (transcription factors NF-κB and AP-1)
regulate the cellular redox status, have a bearing onthe redox status of GSH (glutathione)
modulate folding (and consequently the function) of proteinshave a large substrate range (Trx, H2O2, dehydro-ascorbate, proteins)
Thioredoxin reductases
are involved in DNA biosynthesis
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Selenium deficiency decrease in enzyme activity
total knockout of the enzyme
Thioredoxin reductases
dysregulation of proliferation and differentiation of cells:is supposed to be part of the malignant transformation of cells
is considered to be a lethal factor in theearly embryonic stage
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Tumour prevention
and cancer
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Selenium is effective on two levels
1. indirectly via incorporation into specific selenoproteins e.g. GPx
2. directly through built-up selenium metabolites e.g. methylselenol
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Chemopreventive effect of selenium
Fig. modified according to: Combs GF Jr, (1999): Chemopreventive mechanisms of selenium. Medizinische Klinik (Munich) 94 (Suppl. III), 18-24
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Selenium has a tumour-preventive property
Qidong-study: Primary hepatic cancer(China 1985-1989, primary hepatic cancer, placebo-controlled, 20,847 probands)
Linxian-study: Esophageal cancer(China 1986-1991, esophageal cancer, 29,584 probands)
Clark-study
Tumour-preventive effect verified in large studies
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Selenium has a tumour-preventive property
Design: multicentre, randomised, double-blind, placebo-controlled
Probands: 1,312Test centres: USA, low selenium regions
1983 - 1996Period of surveillance: 4.5 yearsMedication: 200 µg selenium/day
Clark-study
Effects of selenium supplementation for cancer prevention in patients with carcinoma of the skin. A randomized controlled trial. Nutritional Prevention of Cancer Study Group. Clark LC, Combs GF Jr, et. al., (1996): JAMA 276 (24), 1957-1963
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Selenium has a tumour-preventive property
Results of the Clark-study
Reduced incidence for secondary carcinoma in skin cancer patients by selenium supplementation
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and cancer
Kinds of cancer
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Cancer figures in Germany
48,650prostate
4,350testes
55,150mammary
gland
11,350uterine corpus
6,500cervix
9,950ovary
Man Woman7,800 2,600oral cavity and throat
32,550 12,450lung11,200 8,250stomach
6,050 6,600pancreas35,600 35,800large bowel and rectum18,850 7,100urinary bladder
900 850Hodgkin‘s disease5,850 6,250Non-Hodgkin‘s lymphoma
5,500 4,750leukemia
218,250* 206,000*total*Figures without non-melanotic skin cancer
Estimated number of cancer incidences in Germany 2002
Source: Gesellschaft der epidemiologischen Krebsregister e.V. in Zusammenarbeit mit dem Robert-Koch-Institut. 5. überarbeitete, aktualisierte Ausgabe Saarbrücken, 2006
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Prostate carcinoma
important role as chemopreventive agent correlation between selenium deficiency and
increased incidence to contract prostate cancer inhibition of the growth in vitro by blocking the cell
cycle, the DNA synthesis and induction of apoptosis
Reduction of prostate carcinoma incidence by
preventive selenium administration!
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Mammary carcinoma
tumour-protective characteristics in vivo low selenium concentrations in the blood in
case of mammary carcinoma patients secondary lymphedema:
- adjuvant therapy with selenium- better transportation of the lymphs- binding of radicals in the congested
tissue
- positive influence of immunocompetent cells
- avoidance of appearance of erysipelas
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Ovarian carcinoma
second most frequent malignant disease of the female sexual organs
increase with rising age 9,950 incidences per year 1.7% risk to contract ovarian carcinoma
in one‘s life
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Bronchogenic carcinoma
selenium supplementation protects from lung carcinoma risk
low plasma selenium levels increase lung carcinoma risk
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Colorectal carcinoma
selenium deficiency correlates with the risk to contract bowel cancer
higher plasma selenium levels are associated significantly with a lower risk of bowel cancer
induction of selenoprotein P andthus, cell protection
reduction of the risk of recurrence ofa colorectal adenoma
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Dosage recommendations
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Chemotherapy
and cancer
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Selenium and chemotherapy
PRO selenium+ reduction of side effects
+ resensitization of cells resistant to cytostatics
+ chemoprotective effect
+ cytostatic efficacy is not influenced
+ improvement of the quality of life
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Lowered selenium levels in tumour patients
mostly before the tumour is diagnosed oxidative stress is reinforced by the chemotherapy
increased radical strain
healthy patient tumour patient
= selenium concentration in blood
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Chemotherapy
side effects
chemotherapy as exogenous source of free radicals
Cytostatic action approaches and effects: inhibition of replication and transcription induction of the apoptosis antimetabolite effect inhibition of the development of the mitotic spindle inhibition of the cell division formation of radicals
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Possible side effects of a chemotherapy
nausea, vomiting, loss of appetite diarrhea, constipation loss of hair tiredness, exhaustion increase in infections chronic organ damages
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healthy body cell
Reduction of side effects
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side effects
quality of life
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No reduction of the cytostatic efficacy
Example etoposide and bronchogenic carcinoma cells
Source: Schroeder CP, Goeldner EM, Schulze-Forster K, Eickhoff CA, Holtermann P, Heidecke H, (2004): Effect of Selenite combined with chemotherapeutic agents on the proliferation of human carcinoma cell lines. Biological Trace Element Research 99 (1-3), 17-25
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Increase in anti-tumour efficacy of cytostatics
Example 5-Fluorouracil (5-FU)-sensitive colon carcinoma cells
Source: Schroeder CP, Goeldner EM, Schulze-Forster K, Eickhoff CA, Holtermann P, Heidecke H, (2004): Effect of Selenite combined with chemotherapeutic agents on the proliferation of human carcinoma cell lines. Biological Trace Element Research 99 (1-3), 17-25
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Selective effect of seleniumProcesses in the tumour cell
high GSH-concentration intracellularly a lot of GSH leads to sensitivity for selenium administration of selenium results in formation of GS-Se-GS consequence
1. tumour cell becomes impoverished in GSH2. multidrug resistance is prevented3. cells, resistant to cytostatics, are resensitized4. high concentrations of GS-Se-GS induce apoptosis
+ Na-Selenite
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Selective effect of seleniumProcesses in the normal cell
normal GSH-concentration intracellularly normal selenium sensitivity no increased formation of GS-Se-GS consequence
1. no impoverishment in GSH2. selenium is available for selenium-dependent enzyme systems3. the antioxidative defence works4. increased resistance to cytostatics5. no induction of apoptosis
+ Na-Selenite
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Advantages of a selective sodium selenite therapy
+ reduction of the side effects
+ better compliance, fewer abruptions of the therapy
+ improvement of the quality of life
+ inhibition of inflammatory processes
+ lower susceptibility to infections
+ good tolerability
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Dosage recommendations
days(s) before the first chemotherapy:duration 1 - 2 days 900 µg selenium/day
directly successive treatment day(s):duration 1 up to max. 5 days 900 µg selenium/dayfrom 6th day of treatment 300 µg selenium/day
treatment-free days:duration variable 300 µg selenium/day
Chemotherapy
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Radiotherapy
and cancer
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Selenium and radiotherapy
PRO selenium+ stabilisation of the immune system
+ reduction of side effects
+ radioprotective effect
+ improvement of the quality of life
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Radiotherapy and possible consequences
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Possible side effects of a radiotherapy
damages to mucous membranes, inflammations damaging the blood count dysfunctions of the organs in the radiation area,
such as diarrhea (intestines), micturition difficulties (bladder), breathlessness (lung), difficulties in swallowing (throat)
permanent damages to organs in the radiation area skin damages exhaustion, tiredness
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Redox status
lowered selenium concentration in blood and serum
Tumour patient
• limited redox capacity
• balance between oxidation and antioxidation is disturbed
reduction of the ability to detoxify free radicals
reduced glutathione peroxidase activity
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Advantages of a selective sodium selenite therapy
+ in general fewer side effects
+ fewer severe infections
+ better quality of life
+ improvement of the radiation-induced lymphedema
+ accelerated hematopoetic regeneration
+ good tolerability
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Dosage recommendations
day(s) before the first radiotherapy:duration 1 - 2 days 900 µg selenium/day
directly successive treatment day(s):duration variable 300 µg selenium/day
treatment-free days:duration variable 300 µg selenium/day
Radiotherapy
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and thyroid
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Source: Forum Schilddrüse e.V.60596 Frankfurt/Main
Position of the thyroid
hyoid boneepiglottis
larynx
thyroid
thyroid cartilage
trachea
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essential for the function of the thyroid
has a key role in the metabolisation of iodine
protects the thyroid from destruction by peroxides/radicals
has an antioxidative und anti-inflammatory effect
is supplied only inadequately with nutrition
The thyroid, our organ with the highest content of selenium
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Graves‘ diseaseA form of hyperthyroidism appearing spontaneously.The body forms antibodies, specifically directed to the thyroid, which stimulate the thyroid for an increased production of thyroid hormones. Frequently, the disease is combined with protruding eyes or other symptoms of the thyroid-associated ophthalmopathy.
Thyroid-associated ophthalmopathy (TAO)Most frequent accompanying symptom to Graves‘ disease. From the clinical point of view, the appearance of hyperthyroidism and TAO often is closely coupled. The orbital inflammatory process results in a swelling of the orbital connective and muscle tissue leading to mechanical complications in the orbits localized by bones (proptosis).
Hashimoto‘s thyroiditis
Autoimmune diseases of the thyroid
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What is Hashimoto’s thyroiditis?
Hashimoto‘s thyroiditis =Chronic autoimmune thyroiditis (AIT)
Disease starts from the immune system- immigration of lymphocytes into the thyroid
Immune system attacks the thyroid- shrinkage (= destruction and loss of glandular cells)- replacement of glandular cells by connective tissue
AIT mostly chronic
Dr. Hakaru Hashimoto(1881-1934)
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Hashimoto‘s thyroiditis
The chameleon among the thyroid diseases
The Hashimoto‘s thyroiditis cannot be regarded as pure thyroid disease but as dysfunction of the immune balance with consequences for many organ systems and bodily functions. For this reason, it is associated with numerous possibly hardly tangible symptoms. Typical complaints of a hypothyroidism, hyperthyroidism and of the autoimmunedisease can appear.
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Hashimoto‘s thyroiditis
The chameleon among the thyroid diseases
symptom-free to poor in symptoms at the beginning, even hyperfunction is possible is gradually replaced by a hypofunction fluctuating hormone values, fluctuating TPO-Ab
values possible complex disaease
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Frequency
- up to 10% of the population
- women circa 10x more often
- in every age
- more frequently in selenium deficiency regions
- more often in case of high iodine supply
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Consequence: Hypothyroidismhormone level
decreasing hormone production
Hypothyroidismformation of insufficient thyroid hormones
slowdown of the metabolism
increase in weight
weak performance
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Symptoms in case of thyroid hormone deficiency
Physical symptomsWomen menstrual cycle disturbances infertility
Men loss of libido impotency
Toddlers growth retardation backward intellectual development
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Symptoms in case of thyroid hormone deficiency
Psychic symptoms
general slowdown
tiredness
difficulty in concentrating
weak memory
listlessness
depressed mood
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Clinical studies
Selenium and Hashimoto‘s thyroiditis
Design: placebo-controlled, randomisedDuration: 3 monthsPatient collective: 70 female patients, TPO-Ab(antibodies
against thyroidal peroxidase) > 350 IU/mlMedication: all hormone substitution (LT4)
36 patients 200 µg Se/day34 patients placebo
Main objective criteria: change of the concentration of TPO-antibodies (TPO-Ab = antibodies against thyroidal peroxidase)
Secondary end point: subjective quality of life
Source: Gärtner R, Gasnier BC, Dietrich JW, Krebs B, Angstwurm MW, (2002): Selenium supplementation in patients with autoimmune thyroiditis decreases thyroid peroxidase antibodies concentrations. J Clin Endocrinol Metab 87 (4), 1687-1691
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Clinical studies
Results:
Source: Gärtner R, Gasnier BC, Dietrich JW, Krebs B, Angstwurm MW, (2002): Selenium supplementation in patients with autoimmune thyroiditis decreases thyroid peroxidase antibodies concentrations. J Clin Endocrinol Metab 87 (4), 1687-1691
change of the generalwell-being
course of the TPO-Ab under selenium substitution
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Clinical studies
Follow-up study
Design: cross-over follow-upDuration: 6 monthsPatient collective: 47 female patients (average age 41)Medication: 13 patients (previously already verum):
200 µg selenium/day14 patients (previously placebo): 200 µg selenium/day11 patients (previously already placebo): placebo9 patients (previously selenium): placebo
Source: Gärtner R, Gasnier BC, (2003): Selenium in the treatment of autoimmune thyroiditis.Biofactors 19 (3-4), 165-170
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Clinical studies
Results follow-up study:
Source: Gärtner R, Gasnier BC, (2003): Selenium in the treatment of autoimmune thyroiditis.Biofactors 19 (3-4), 165-170
course of TPO-Ab under selenium substitutionleft column = start follow-upright column = end follow-up after 6 months
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Conclusion of both studies
selenium supplementation over a total of 9 months results in a significant decrease in TPO-Ab
discontinuation of selenium after 3 months results in a significant reincrease in TPO-Ab
remarkable improvement of the quality of life due to selenium supplementation
very good tolerability, especially with long-term intake of selenium over months
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Treatment – Hashimoto’s thyroiditis
substitution - accordingto the demand - of the lacking hormone quantity
selenium therapy with sodium selenite
Triiodothyronine(T3)
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Dosage recommendations
children 50 µg selenium/day
adolescents 150 µg selenium/day
adults 200 - 300 µg selenium/day
Hashimoto‘s thyroiditis
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and rheumatism
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Rheumatism
One name for many manifestations
inflammatory joint and spine diseases(e.g. chronic polyarthritis, Bechterew‘s disease, psoriasis arthritis)
degenerative joint and spine diseases (e.g. arthrosis of the knee, hip, shoulder and finger joints or the spine)
non-articular rheumatism (e.g. fibromyalgia) metabolic disorders with rheumatic complaints
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Rheumatoid arthritis Development of a joint inflammation
Source: http://www.bgv-rheuma.de
presented antigen
T-cell
scavenger cellsubstances supporting inflammation
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Rheumatoid arthritis
Development of a joint inflammation
1. immune system discovers foreign substance (antigen/virus)
scavenger cells take up the antigen and present parts on the surface
T-cells recognise foreign substance, search further foreign substances in blood and tissue
2. T-cells react to endogenous tissue properties in thesynovial membrane
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Rheumatoid arthritis
Development of a joint inflammation
3. wrongly programmed T-cells release messengers (among others IL-2, IFN)
thus, activation of further T-cells and scavenger cells (and other immune cells / tissue and cartilage cells)
4. this way, scavenger cells receive the inflammation
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Arachidonic acid metabolism
food (animal fats)
arachidonic acid
messengers supporting inflammation
development (= support + strengthening)
of rheumatism
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Inflammation metabolism
has an anti-inflammatory potential modulation of the prostaglandin and
leukotriene synthesis restriction of the production of
inflammatory cytokines inhibition of the pro-inflammatory
transcription factor NF-k(kappa)B detoxification of peroxides
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Risk factor: Selenium deficiencySelenium status in patients suffering from rheumatic diseases
Selenium status (μmol/l; mean value ± SD) of patients with rheumatism and healthy people (* JRA = juvenile rheumatoid arthritis)
Modified according to: Sill-Steffens R, (2003): Bedeutung und Einsatzmöglichkeiten von Selen bei Rheuma. OM. Z. f. Orthomolekulare Medizin 4, 4-6
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Risk factor: Selenium deficiency
Result people suffering from rheumatism show lowered
selenium levels in case of chronically increased inflammatory activity,
there are high strains with free radicals, which are involved decisively in the destruction of the joints
low selenium levels correlate with a higher disease activity
reduced glutathione peroxidase activities lead to increased oxidative stress and thus, to a strengthening of inflammatory processes
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Advantages of a selective sodium selenite therapy
+ balances selenium deficits
+ ideal glutathione peroxidase activities
+ decrease in the inflammation or disease activity
+ pain reduction, less morning stiffness,decline of joint swellings
+ saving of NSAIDs, reduction of the corticoid demand
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Dosage recommendations
rheumatoid arthritisover 3 months 200 µg selenium/day
acute attacksinitially 900 µg selenium/daythen 300 µg selenium/day
maintenance therapy 200 µg selenium/day
Rheumatic diseases
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and immune system
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Selenium and immune system
The well-coordinated immune systemresponds particularly sensitively to
a selenium deficiency!
antiviral defence
antimicrobial defence
better defence performance
lower susceptibility to infections
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Influence of the immune system – tumour diseases
Prospective study
Duration of study: 11 yearsPatient collective: 3,625 patients
211 patients with cancer diseaseMeasurement: cytotoxicity of the peripheral lymphocytes
Natural cytotoxic activity of peripheral-blood lymphocytes and cancer incidence: an 11-year follow-up study of a general population. Imai K, Matsuyama S, Miyake S, Suga K, Nakachi K, (2000): Lancet 356, 1795-1799
connection between activity of the immune system and development of cancer
risk of a cancer disease is lower in case of higher cytotoxicity of the lymphocytes
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NK cells
Definition
Natural killer cells are populations of lymphocytes, which can be activatedto cause a significant cytotoxic activity and high concentrationsof cytokines and chemokines.
Their function is among others to destroy malignant cells.
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NK cells
Important immune parameter in oncology A low NK cell activity is a risk factor for the development of
tumours. The survival rate correlates with the intensity of the NK cell
activity.Tumor patients with a high NK cell activity show a significantly longer survival time without developing metastases than patients with a low NK cell activity.
As part of the unspecific immune defence, the NK cells bind to the target cells and initiate their lysis.If the target cell possesses apoptosis receptors, the conse-quence will be the release of the programmed cell death (apoptosis).
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Selenium increases the NK cell activity
Practice study
Patient collective: 70 chronically sick patientsMedication: Cefasel® 300 µg dailyMeasurement: NK cell activity
Improvement of the immunocompetence of tumour patientsErpenbach K, (2003): Practice study, unpublished
initial situation: clearly lowered values or basal NK activities in tumour patients
NK cell activity was increased significantly by 300 µg selenium
significant improvement of the immunocompetence
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Selenium increases the NK cell activity
Source: Erpenbach K, (2003): Improvement of the immunocompetence of tumour patients.Practice study, unpublished
rise in the selenium level (standard value: 74-139 µg/l) correlates with an increase in the NK cell activity (desired value > 25%)
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Selenium and its effect on the immune system
increases the activity and quantity of NK cells
modulates the proliferation of lymphocytes
raises the efficiency of the phagocytosis
stimulates the synthesis of -interferon
increases the antibody synthesis
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Dosage recommendations
adults 100 - 200 µg selenium/day
Immune system
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antioxidative immune-modulating chemopreventive influence on the metabolism of the tumour cell support of DNA repair mechanisms support of the apoptosis anti-inflammatory cardioprotective detoxifying in case of heavy metal strain
Pharmacological properties
Pharmacology