Hormone
hideHormones (from Greek ὁρμή - "impetus") are chemicals released by cells that affect cells in other parts of the body. Only a small amount of hormone is required to alter cell metabolism. It is essentially a chemical messenger that transports a signal from one cell to another. All multicellular organisms produce hormones; plant hormones are also called phytohormones. Hormones in animals are often transported in the blood. Cells respond to a hormone when they express a specific receptor for that hormone. The hormone binds to the receptor protein, resulting in the activation of a signal transduction mechanism that ultimately leads to cell type-specific responses.
Endocrine hormone molecules are secreted (released) directly into the bloodstream, while exocrine hormones (or ectohormones) are secreted directly into a duct, and from the duct they either flow into the bloodstream or they flow from cell to cell by diffusion in a process known as paracrine signalling.
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News tagged with hormone
Drought resistance explained
3 hours ago |
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Much as adrenaline coursing through our veins drives our body's reactions to stress, the plant hormone abscisic acid (ABA) is behind plants' responses to stressful situations such as drought, but how it does ...
Scientists uncover new key to the puzzle of hormone therapy and breast cancer
11 hours ago |
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The use of postmenopausal hormone therapy has decreased over time in the United States, which researchers suggest may play a key role in the declining rate of atypical ductal hyperplasia, a known risk factor ...
New finding suggests prostate biopsy is not always necessary
Nov 06, 2009 |
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Researchers at Wake Forest University School of Medicine and the University of Wisconsin-Madison have discovered that some elevated prostate-specific antigen (PSA) levels in men may be caused by a hormone normally occurring ...
Newly revised guidelines for managing thyroid cancer published in Thyroid journal
Nov 05, 2009 |
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The American Thyroid Association has released new, revised Management Guidelines for the diagnosis and treatment of patients with thyroid nodules and thyroid cancer. The new guidelines are published in Thyroid, a peer-reviewed journa ...
Cause of common chronic diarrhea revealed in new research
Nov 02, 2009 |
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(PhysOrg.com) -- A common type of chronic diarrhoea may be caused by a hormone deficiency, according to new research published in the November issue of Clinical Gastroenterology and Hepatology. The author ...
Short-term hormone therapy and intermediate dose radiation increases survivial for early stage prostate cancer
Nov 02, 2009 |
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Short-term hormone therapy given prior to and during intermediate dose radiation treatment for men with early stage prostate cancer increases their chance of living longer, compared to those who receive the same radiation ...
Placental precursor stem cells require testosterone-free environment to survive
Oct 29, 2009 |
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Trophoblast stem cells (TSCs), cells found in the layer of peripheral embryonic stem cells from which the placenta is formed, are thought to exhibit "immune privilege" that aids cell survivability and is potentially beneficial ...
Study uncovers key to how 'triggering event' in cancer occurs
Oct 29, 2009 |
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Researchers at the University of Michigan Comprehensive Cancer Center have discovered what leads to two genes fusing together, a phenomenon that has been shown to cause prostate cancer to develop.
Teriparatide outperforms alendronate in treating steroid-induced osteoporosis
Oct 29, 2009 |
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A recent study determined glucocorticoid-induced osteoporosis (OP) is now treatable with Teriparatide, a synthetic form of the human parathyroid hormone. Researchers found patients with glucocorticoid-induced OP who were ...
Study shows hormone replacement therapy decreases mortality in younger postmenopausal woman
Oct 28, 2009 |
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Hormone replacement therapy (HRT) to treat menopausal estrogen deficiency has been in widespread use for over 60 years. Several observational studies over the years showed that HRT use by younger postmenopausal women was ...
Location of body fat affects risk of blood clots in men, women
Oct 26, 2009 |
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The location of extra pounds appears to affect the risk of blood clots in middle-aged people, but affects men and women differently, researchers report in Circulation: Journal of the American Heart Association.
Tips on hormone use, coping with menopause
Oct 26, 2009 |
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(AP) -- What to do if menopause makes you miserable?
'Bioidenticals' not FDA-approved, contain estrogen
Medicine & Health / Medications
Oct 25, 2009 |
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(AP) -- Miserable in menopause, Elizabeth Alsgaard pondered an awful choice: Drenching hot flashes or hormone therapies that might raise the risk of cancer. What former actress Suzanne Somers raved about held much more appeal ...
Scientists reveal secrets of drought resistance
Oct 22, 2009 |
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A team of biologists in California led by researchers at The Scripps Research Institute and the University of California, San Diego has solved the structure of a critical molecule that helps plants survive during droughts. ...
Presidential election outcome changed voters' testosterone
Oct 20, 2009 |
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(PhysOrg.com) -- Young men who voted for Republican John McCain or Libertarian candidate Robert Barr in the 2008 presidential election suffered an immediate drop in testosterone when the election results were ...
