Relation of iodin to the structure of human thyroids

relation of iodin and histologic structure to diseases in general : to exophthalmic goiter : to cretinism and myxedema
  • 54 Pages
  • 4.58 MB
  • English
American Medical Association , Chicago
Thyroid gland., Graves" disease., Cretinism., Myxe
Other titlesArchives of Internal Medicine.
StatementDavid Marine and C. H. Lenhart.
ContributionsLenhart, C. H.
The Physical Object
Pagination54p. :
ID Numbers
Open LibraryOL19600760M

Marine and Lenhart: Further observations on the relation of iodin to the structure of the thyroid gland in the sheep, dog, hog and ox. The Archives Int Med.,iii, CrossrefCited by:   lodine plays a central role in thyroid physiology, being both a major constituent of thyroid hormones (THS) and a regulator of thyroid gland function.

This review concerns those aspects of thyroid physiology in which significant advances have been made in recent by: Concerns have been raised over the use of iodine for disinfecting drinking water on extended space flights. Most fears revolve around effects of iodide on thyroid function.

iodine (I2) is the form used in drinking-water disinfection. Risk assessments have treated the various forms of iodine as if th Cited by: Thyroid follicular cells are unique in being highly specialized to absorb and use iodine.

They absorb iodine as iodide ions (I -) from the blood and use the iodide to produce thyroid hormones. The cells also use some of the iodide they absorb to form a protein called thyroglobulin, which serves to store iodide for later hormone synthesis.

The results of 91 I tolerance tests in 80 patients are recorded. In patients with clinical and histological signs of thyrotoxicosis, injected I disappeared from the blood stream more rapidly than in individuals with clinically normal thyroids. Injected I disappeared less rapidly from the circulation in hypothyroidism.

There did not appear to be any definite correlation between I tolerance and Cited by: 8. Eventually the addition of iodine to salt solved the problem.

The role of iodine began to be clarified in when it was shown to be present in the thyroid gland. Finally in Calvin Kendall isolated thyroxin, a thyroid hormone which had four iodine atoms incorporated into its molecular structure.

Thyroid hormones are derivatives of the the amino acid tyrosine bound covalently to iodine.

Description Relation of iodin to the structure of human thyroids PDF

The two principal thyroid hormones are: thyroxine(also known as T4 or L-3,5,3',5'-tetraiodothyronine) triiodothyronine(T3 or L-3,5,3'-triiodothyronine) As shown in the following diagram, the thyroid hormones are basically two tyrosines linked together with the critical addition of iodine at three or four positions.

Location and Structure of Thyroid Gland: The thyroid gland is the largest endocrine gland located anterior to the thyroid cartilage of the larynx in the neck. The gland is well supplied with blood vessels. It is bilobed organ. The two lobes are connected by a narrow structure called the isthmus.

Thyroid hormones are two hormones produced and released by the thyroid gland, namely triiodothyronine (T 3) and thyroxine (T 4).They are tyrosine-based hormones that are primarily responsible for regulation of metabolism.T 3 and T 4 are partially composed of iodine.A deficiency of iodine leads to decreased production of T 3 and T 4, enlarges the thyroid tissue and will Relation of iodin to the structure of human thyroids book the.

As mentioned earlier, the relationship of iodine intake to thyroid disease is u-shaped due to the fact that both deficient and excessive intake can impair thyroid function. Iodized salt program should be monitored carefully to provide adequate iodine but also avoid excess intakes.

Published September 12 Many people with thyroid and autoimmune thyroid conditions are confused with regards to iodine supplementation. While some healthcare professionals still recommend large doses of iodine to their patients, other healthcare professionals recommend for people with thyroid conditions, and especially those with autoimmune thyroid conditions, to completely avoid iodine.

As the title suggests, it talks a great deal about the importance of iodine, the role it plays in the body and in thyroid health, explains why most people are deficient in iodine, and demonstrates how such a deficiency causes certain conditions, including thyroid conditions, as well as certain types of cancers.

Zimmermann MB, Galetti V. Iodine intake as a risk factor for thyroid cancer: A comprehensive review of animal and human studies.

Thyroid Res ; [PubMed abstract] Cooper LF, Barber EM, Mitchell HS. Nutrition in Health and Disease, 9th ed. J.B. Lippincott Co, Philadelphia.

pg The Iodine. If you discern the structure & chemical formula of Thyroid hormone triiodothyronine and thyroxine, there will 3 and 4 molecules of Iodine for thyroid respectively.

Apart from that iodine and thyroid is also helpful for growth and development of our cells and muscles. Also used in the makes of proteins from amino acids.

Iodine Deficiency Symptoms. But iodine also binds to fatty acids, so iodine oil can also be given orally or intravenously to severely iodine-deficient patients in the short term.

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Nascent iodine is like the precursor form of iodine, which converts into thyroid hormones. The human body can recognize and assimilate this form more easily than potassium salt. The book contains good information on all diseases related to low iodine levels, including thyroid disorders, obesity and breast cancer.

Chapter 8 talks about getting started: testing levels of iodine, supplementation and food sources of iodine in a list s: The normal thyroid contains between 2 and 20 mg of iodine.

About 70 percent is in the form of the amino acids mono- and diiodotyrosine, the precursor molecules of the thyroid hormones. They are in peptide linkage in the large storage iodoprotein, thyroglobulin (MW about ,). Methods are given in great detail for measuring the I-accumulating function of the human thyroid gland in different states of activity.

Both tracer and therapeutic doses of radio-active 1 were used but the results were similar. The mean rate of accumulation by the thyroids of 5 patients with normal glands and low-grade thyroid tumours was ± per cent.

of the dose per hr. We have observed that following infections and toxemias of a severe nature, the same changes take place in the human thyroid as occur in the thyroid g. Chronic ingestion of modest doses of dietary iodine, radiation, and polyhalogenated biphenyls (PCB's and PBB's) are environmental factors with known or suspected adverse effects on the human thyroid.

Iodine consumption in the United States is approaching 1 mg daily for a large segment of the population. Radioactive isotopes of iodine and technetium can be used to evaluate the structure and function of the thyroid.

In hyperthyroid patients, the fractional uptake by the thyroid of a tracer dose may help distinguish conditions in which there is gland hyperfunction (e.g., Graves' disease) from inflammatory thyroiditis or exogenous hyperthyroidism. Iodine is critical to human health. It forms the basis of thyroid hormones and plays many other roles in human biochemistry.

While the thyroid gland contains the body’s highest concentration of iodine, the salivary glands, brain, cerebrospinal fluid, gastric mucosea, breasts, ovaries and a part of the eye also concentrate iodine.

Although the Wolff–Chaikoff study suggested that a temporary inhibition of thyroid hormone synthesis may happen, no clinical symptoms of hypothyroidism have ever been noted with higher doses according to Dr. Mark Sircus in his book on iodine – Iodine.

The problem with Amiodarone is that it contains a relatively large concentration of iodine. In fact, approximately 37% of this drug consists of iodine. Additionally, the chemical structure of Amiodarone is similar to the structure of T4, or thyroxine, which is one of the hormones produced by the thyroid.

Total body iodine (I) content was reported in many studies of medical literature. But only thyroidal iodine content has been well estimate (by fluorescent scanning) in the normal human thyroid and. IODINE IS an essential trace element in the human diet, but most people think of iodine only in relation to the thyroid is true that iodine is critical for healthy thyroid function, but 70 per cent of the body's iodine is distributed to other tissues, particularly the breasts, eyes, stomach, the cervix, ovaries, prostate, and the salivary and sweat glands.

The human body needs iodine to make thyroid hormone. During fetal development, infancy, and childhood, thyroid hormone is essential for the brain and nervous system to develop normally.

Too little iodine, and thus too little thyroid hormone, can lead to mental retardation, dwarfism, hearing loss.

However, the thyroid gland is the only tissue where both DUOX1 and DUOX2 are expressed under physiological conditions. The definitive proof that DUOX is fundamental for thyroid hormone biosynthesis can be found in the first description of mutations in DUOX2 genes related to human.

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DAVID MARINE—C. LENHART ANATOMICAL CLASSIFICATION The confusion that at present exists throughout all phases of thy¬ roid changes can be inferred from the vast literatur.

Other articles where Iodine is discussed: iodine: Occurrence and distribution: exceptionally useful radioactive isotope is iodine, which has a half-life of eight days. It is employed in medicine to monitor thyroid gland functioning, to treat goitre and thyroid cancer, and to locate tumours of the brain and of the liver.

It is also used in investigations to trace the course. The link between goiter, myxedema, and iodine was established when, inBaumann and Roos, working in Freiburg, Germany, digested animal thyroid glands and were surprised to isolate a residual insoluble fraction that was ∼10% iodine. They found this substance, termed thyroiodine, to be effective in the treatment of both myxedema and goiter.The thyroid gland, which is a butterfly-shaped organ, is located in the base of the human neck and uses dietary iodine to produce its main hormones (Benvenga et al.

). Thyroxine is secreted by. Iodine is necessary for the proper function of many of the body’s tissues including the breasts, pancreas, brain, stomach, adrenal glands, skin, salivary glands, and cerebral spinal fluid.

Iodine deficiency can lead to a dysfunction of these tissues and cause symptoms such as dry mouth, dry skin, reduced alertness, brain fog, fibromyalgia, fibrocystic breasts, and many.