News tagged with hormone

Related topics: breast cancer , women , plants , estrogen , protein

Season's eatings

'Tis the season of plenty of food and drink. While celebrating should be joyful, for some women, it's not. All the holiday temptations can add another layer to an already complicated biological process.

Dec 16, 2014
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Mutations drive unrestrained secretion

Benign tumors in the pituitary gland lead to uncontrolled secretion of the stress hormone cortisol by the cells of the adrenal cortex. An international research effort has now characterized a new mechanism ...

Dec 10, 2014
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A potential breakthrough on liver cancer

In the battle of humans versus disease, the latter usually gets the upper hand in the end. For patients with terminal diseases, the pace of biomedical research can seem glacial. It takes years—if not decades—to ...

Sep 08, 2014
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Hormone

Hormones (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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