Related topics: women , estrogen
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
New human reproductive hormone could lead to novel contraceptives
17 hours ago |
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(PhysOrg.com) -- Nearly 10 years after the discovery that birds make a hormone that suppresses reproduction, University of California, Berkeley, neuroscientists have established that humans make it too, opening ...
Exposure to young triggers new neuron creation in females exhibiting maternal behavior
Medicine & Health / Neuroscience
Dec 17, 2009 |
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Maternal behavior itself can trigger the development of new neurons in the maternal brain independent of whether the female was pregnant or has nursed, according to a study released by researchers at Tufts University's Cummings ...
Study strengthens link between sirtuins proteins and life extension
Dec 14, 2009 |
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(PhysOrg.com) -- A new paper from MIT biology professor Leonard Guarente strengthens the link between longevity proteins called sirtuins and the lifespan-extending effects of calorie restriction.
Decline of hormone therapy decreases breast cancer cases, analysis finds
Dec 09, 2009 |
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The declining use of hormone therapy among women has led to 6,000 fewer invasive breast cancer cases a year, according to an analysis by researchers at the University of Wisconsin-Madison. The research quantifies and advances ...
Testosterone does not induce aggression
Medicine & Health / Neuroscience
Dec 08, 2009 |
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New scientific evidence refutes the preconception that testosterone causes aggressive, egocentric, and risky behavior. A study at the Universities of Zurich and Royal Holloway London with more than 120 experimental subjects ...
Cut out the (estrogen) middleman
Medicine & Health / Neuroscience
Dec 08, 2009 |
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Estrogen seems to act like a middleman in its positive effect on the brain, raising the possibility that future drugs may bypass the carcinogenic hormone altogether while reaping its benefits.
Researchers discover how a brain hormone controls insect metamorphosis
Dec 03, 2009 |
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A team of University of Minnesota researchers have discovered how PTTH, a hormone produced by the brain, controls the metamorphosis of juvenile insects into adults.
Random DNA mix-ups not so random in cancer development
Dec 03, 2009 |
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Researchers at the UC San Diego School of Medicine have pinpointed a mechanism that may help explain how chromosomal translocations - the supposedly random shuffling of large chunks of DNA that frequently lead to cancer - ...
Dessert on your mind? Your muscles may be getting the message
Dec 01, 2009 |
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Even the anticipation of sweets may cause our muscles to start taking up more blood sugar, say researchers reporting in the December issue of Cell Metabolism. That message is delivered via neurons in the brain's hypothalamus contai ...
Study Finds Treatment With Anabolic Hormone May Enhance Local Bone Regeneration
15 hours ago |
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(PhysOrg.com) -- In research that could open new avenues of investigation in the prevention and treatment of fractures, in bone regeneration and tissue engineering, scientists from Yale School of Medicine ...
RXR activation -- hope for new Parkinson's disease treatment
Medicine & Health / Neuroscience
Dec 11, 2009 |
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Following up on their previous work showing the rescue of dopamine neurons by chemicals that interact with the retinoid X receptor (RXR), researchers have now investigated the potential of these chemicals, known as RXR ligands, ...
Researchers find long awaited key to creating drought resistant crops
Dec 03, 2009 |
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Van Andel Research Institute (VARI) researchers have determined precisely how the plant hormone abscisic acid (ABA) works at the molecular level to help plants respond to environmental stresses such as drought and cold. ...
'The pill' for him: Scientists find a hormonal on-and-off switch for male fertility
Nov 30, 2009 |
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A new research report published in the December 2009 print issue of The FASEB Journal could one day give men similar type of control over their fertility that women have had since the 1960s. That's because scientists have f ...
'Comfort food' a stress killer: Australian study
Nov 24, 2009 |
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A high-fat, high-sugar diet could have the same effect on brain chemistry as mood-altering drugs, giving scientific support to the craving for "comfort food", Australian researchers said Tuesday.
More blood vessels in hormone-resistant prostate tumors
Dec 15, 2009 |
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Patients with advanced prostate cancer are often treated with hormones, but when the tumours start growing again they have more and different blood vessels, reveals a thesis from the Sahlgrenska Academy, at the University ...
