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The Endocrine System01:29

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The endocrine system is an extensive network of glands – organs or tissues in the body that create chemicals that control many bodily functions, that secrete hormones, which are chemical messengers that play essential roles in regulating various bodily functions. These hormones are secreted into the bloodstream and travel throughout the body. They require specific receptors to convey signals to cells possessing these corresponding receptors. This complex signaling mechanism ensures that...
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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
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The endocrine system sends hormones—chemical signals—through the bloodstream to target cells—the cells the hormones selectively affect. These signals are produced in endocrine cells, secreted into the extracellular fluid, and then diffuse into the blood. Eventually, they diffuse out of the blood and bind to target cells which have specialized receptors to recognize the hormones.
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Mitochondrial disease and endocrine dysfunction.

Jasmine Chow1, Joyeeta Rahman2, John C Achermann2

  • 1Department of Paediatrics, Queen Elizabeth Hospital, 30 Gascoigne Road, Kowloon, Hong Kong, China.

Nature Reviews. Endocrinology
|October 8, 2016
PubMed
Summary
This summary is machine-generated.

Mitochondrial diseases, stemming from genetic defects, often cause endocrine dysfunction, impacting hormone production. Understanding these mitochondrial roles is crucial for developing new therapies for affected patients.

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Area of Science:

  • Endocrinology
  • Mitochondrial Biology
  • Genetics

Background:

  • Mitochondria are vital for endocrine health, synthesizing steroid hormones and providing energy (ATP) for hormone production and transport.
  • Mitochondrial diseases, caused by over 250 monogenic defects in nuclear or mitochondrial DNA, exhibit significant clinical and genetic diversity.
  • Endocrine dysfunction is a common feature of mitochondrial diseases, manifesting as impaired hormone production or secretion.

Purpose of the Study:

  • To review the critical role of mitochondria in endocrine function.
  • To summarize the spectrum of endocrine dysfunctions observed in genetic mitochondrial diseases.
  • To highlight the importance of understanding mitochondrial defects for therapeutic development.

Main Methods:

  • Literature review of mitochondrial diseases and endocrine manifestations.
  • Analysis of genetic defects affecting mitochondrial function and hormone production.
  • Synthesis of clinical, biochemical, and genetic data on mitochondrial endocrine disorders.

Main Results:

  • Diabetes mellitus is the most frequent endocrine issue, but growth hormone deficiency, hypogonadism, adrenal dysfunction, hypoparathyroidism, and thyroid disease are also common.
  • Endocrine involvement can be part of multisystemic disease or, in some cases, the primary manifestation.
  • Next-generation sequencing is expected to uncover further monogenic mitochondrial endocrine diseases.

Conclusions:

  • Mitochondrial dysfunction significantly impacts endocrine health, leading to diverse hormonal imbalances.
  • Targeting mitochondrial pathways offers potential for novel therapeutic strategies in endocrine diseases.
  • Further research into the genetic basis of mitochondrial endocrine disorders is essential for advancing patient care.