Skip to main content

What is thyroid hormone ?|| How it is synthesis ? || thyroid symptom


What is thyroid?

The thyroid is a hormone which is secreted form some specific a gland in the human.
When it secrete more is called hyperthyroidism and when it secretes less is called hypothyroidism. Before I explain about hyperthyroidism and hypothyroidism first explain how thyroid hormone secreted in our body.

How thyroid hormone secreted ?

Thyroid hormone is synthesized and store in follicularcells as form of thyroglobulin molecule.thyroid gland is present in neck of human body and it shape is like butterfly.
Follicular cells which is present in thyroid gland are play mazor roal for this synthesis .
Hypothalamus release the hormone name thyroid stimulating hormone (THS) to stimulating follicular cell to synthesized thyroglobulin which is common chain of tyrosin ring.
Follicular cells outer side is blood vessel .folicular cell outer membren contain the NA I+ symporter which is take iodide in side cell  and inside of the membren ca+ symportor which is pass the iodide to lumen of the follicular cell , then iodide oxidase and to form the iodine .this iodine binds with the thyroglobulin of tyrosin ring to produce MIT and DIT.
MIT –is known as when one iodine bind with tyrosine
DIT is known as when two iodine bind with tyrosine  
It synthesis and utilization are done mainly 5 process
Thyroid gland stimulation
thyroid gland

 1. Iodide uptake

  In our body collect the iodine 30-50 mg form food and  water.form this amount 1/5 pertion is present in the thyroid .in our body thyroid cell have more active transporter which is collect the low concentration of iodine .iodide uptake by the NA+ I- symporter.

2. Oxidation and iodination

In this procress iodide which is present in side the follicular cell are goes apical membren by transporter PENDRIN or simple ca+ aion transporter.
After this procress Iodination is occour and it produce iodide to iodine which is able to bind with the tyrosil of the thyroglobulin with out any help of  enzyme.
And form monoiodotyrosine (MIT) and diiodotyrosine  (DIT)

3. Coupling  

In this procress one MIT and one DIT are produce T3 , two DIT are coupling produce T4. In this procress if more more MIT is present then T3 are produce more .cupling is oxidative reaction it is catalyzed by thyroid peroxidase 
.
4. Storage and release

Thyroglobulin are store the T3 and T4 ,then is again pass to interior of the follicles and remain stored in to thyroid colloid till required .when it required taken back to cell by procres endocytosis and broken down the lysosomal protease.T3 and T4 are release to blood circulation.MIT and DIT are store for reutilization.in our body 60-90 miro gram of T4 and 10-30 micro gram of T3 produced.

5. Peripheral conversion of T4 to T3

Mainly T4 is converted to T3 in theliver and kidney. In this conversion Equal amount of iodine is bind with tyrosin .But in some place T4 is directly act on the brain and pituitary.
mechanism of thyroid hormone synthesis
Thyroid gland internal stucture


Thyroid hormone Metabolism

This hormone is easily bound with plasma protein.Arround 90-95% of T4 is bound with plasma and rest of all are T3.
In the order of affinity for T4 are
1 Thyroxine binding globulin
2 Thyroxine binding prealbumin
3  Albumin
Plasma t1/2 of T4 is 6-7 days, and plasma t1/2 of T3 1-2 days.
This hormone are helps normal growth and development. Best example is metamorphosis of tadpole to forg.
Deficiency of T3 and T4 are main importance of growth and development delay .it directly affect the growth of organ and tissue.it also affect nervous system growth.
T3 and T4 are metabolized lipid by the enhance the lipolysis that the region of cholesterol level decreases.In the blood LDL level are also decrease.
T3 and T4 have metabolized the carbohydrate by enhancing the process glycogenolysis and gluconeogenesis in the liver as a result glucose absorption is increased.
T3 and T4 are the synthesis of certain proteins is increased. but in some cases it causes T3 ia act as catabolic reaction .that the reason weight loss in hyperthyroidism.

Hypothyroidism

Hypothyroidism is occour due to less secretion of thyroid hormone form thyroid  gland .so that there are many diseases are shown like
   Cretinism
   Adult hypothyroidism
   Myxoedema coma
   Nontoxic goiter
   Thyroid nodule
   Papillary carcinoma of thyroid
   Empirical use of Refractory anaemias , menstrual disorders, infertility tritment, chronic healing of ulcers, obstinate constipation

Hyperthyroidism   

Hyperthyroidism is occour due to excess secretion of thyroid hormone form thyroid gland .due to hyperthyroidism symptom are shown most common result are Graves’s disease, and toxic multinodular goiter,asolitary thyroid adenoma, and inflammation.


Comments

Popular posts from this blog

Risperidone side effect, mechanism of action,use

Risperidone side effect, mechanism of action, use
What is Risperidone?
Risperidone is medicine use as antipsychotic treatment. Antipsychotic diseases like Schizophenia, bipolar disorder, autism . How to take risperidone Before taking of this drug must read the manual or leaflet which is present along with this medicine. if you are not comforted with this then take the advice of doctor or pharmacist. It is also used for the treating of obsessive-compulsive disorder .in this disease patient are doing the one work repetitively. It also helpful for dementia. But FDA does not approve for the treatment of dementia.

The doctor always prescribe the drug for beater effect of in the patient or cure the patient if you have side effect occurs or any discomfort with this drug contact with your doctor immediately. RISPERIDONE SIDE EFFECT Mainly common side effect are shown movement problem, sleepiness, seeing a problem, constipation, increased weight .serious side effect permanently movement problem othe…

Nifedipine use, Side Effects, Mechanism of action, Dosage and Adverse effect

What is Nifedipine? Nifedipine tablets belongs to the group of medicines called calcium channel blocking agents. IUPAC name of this drug is dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate. This drug is yellow in color and crystalline powder and insoluble in water.

Contents What is Nifedipine?Nifedipine useNifedipine Side EffectsMechanism of actionPharmacokinetics of nifedipine Adverse effects of NifedipineDose of nifedipine Nifedipine use Nifedipine tablets is a calcium channel blocker that blocks calcium to the muscles wall of the heart, allow the muscles to relax and widen to increase blood flow to the heart; making it easier for the heart to pump and function properly. Nifedipine is widely used to treat
Hypertension
High blood pressure
Chronic stable angina
Ruptured aneurysm (a problem caused by a burst blood vessel around the brain) Early labour for pregnant women Raynaud’s phenomenon Anal fissures High altitude pulmonary edema Spasms of esophagus due to cance…

Triamcinolone acetonide use, side effect, Mechanism action and Dosage

What is Triamcinolone acetonide?Triamcinolone acetonide is a synthetic corticosteroid. Nasal corticosteroids are cortisone-like medicines. They belong to the family of medicines called steroids. These medicines are sprayed or inhaled into the nose to help relieve the stuffy nose, irritation, and discomfort of hay fever, other allergies, and other nasal problems. These medicines are also used to prevent nasal polyps from growing back after they have been removed by surgery. What is Triamcinolone acetonide used to treat?Triamcinolone is a prescription drug to relieve symptoms of rhinitis. It is also used to prevent allergy symptoms including sneezing, itching, and runny or stuffed nose. This drug is use for the treatment of joint pain, swelling and stiffness in an inflammatory disease like rheumatoid arthritis.

This medicine is also used for the treatment of various allergic disorder including asthma, seasonal allergies, blood disorder, hormone the problem, rheumatic fever, disease related…