#corticosterone

[biology-geology-beaches-india]

The Science Research Diaries of Satyendra Sunkavally, p 544.

".....od paet him aeghwylc para ymb sittendra....."

_Beowulf

[biology-geology-beaches-india]

The Science Research Manuscripts of S. Sunkavally. Page 278.

[healthylife77]

Corticosterone and Stress - How Does it Affect the Body?

The body's reaction to stress is also known as the fight-or-fear response that was a very important survival mechanism in the Paleolithic er...

The body's reaction to stress is also known as the fight-or-fear response that was a very important survival mechanism in the Paleolithic era. It allows other mammals and human beings to react rapidly to life threatening situations. However, in today's society, the fight-or-fear response is muted and is only used when there is no immediate threat. Other than this, the body can also respond to non-life-threatening stressors, such as work pressure, traffic jams, household problems, and the like.

[symbiosisonlinepublishing]

Clinical research suggests that a blunted corticosteroid response to trauma may be associated with increased risk of developing post-traumatic stress disorder (PTSD).

[milfitinstitute]

Does Physiological Stress-induced Corticosterone Increase Heme Uptake?

Does Physiological Stress-induced Corticosterone Increase Heme Uptake?

Research Paper Title

Physiological stress-induced corticosterone increases heme uptake via KLF4-HCP1 signaling pathway in hippocampus neurons.

Abstract

Iron overload has attracted much attention because of its adverse effect in increasing the risk of developing several neurodegenerative disorders. Under various pathologic conditions, a lot of heme are released. The aggregation of heme is more…

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[flock-talk]

Just a chart from this book that shows what the stress hormones, do to the bird's body over different durations.

Not even going to pretend to understand half of it (if someone knows I'd love to hear!) but the small parts I can understand I found quite interesting, like how a chronic duration of stress caused a decrease in spleen size and a slower antibody response to antigens.

It's neat to me to see just exactly how the stress weakens the body, we know stress can make birds sick but I did not know the specifics behind it. Considering the spleen is responsible for producing white blood cells and removing damaged blood cells and chronic stress hormone amounts cause that to decrease in size gives me a better understanding of exactly how stress is able to weaken the system and make the bird vulnerable to illness.

Just something interesting I wanted to share (I'm just learning this so please correct me if I'm wrong!)

[dendroica]

Big Brained Birds May Stress Less

Birds in the wild lead a stressful life. Constantly spotting predators lurking in the trees or sensing dramatic changes in temperature is essential for survival, but can leave birds on the edge of a nervous breakdown. Reading these cues triggers changes in the birds’ metabolism, particularly increases in the stress hormone corticosterone. A sharp release of the hormone within 1 to 2 minutes after a cue triggers an emergency response and prepares birds to react quickly to the threat. However, regular exposure to the dangers of the wild and, hence, to high levels of this hormone, has serious health consequences and shortens life expectancy.

Not all birds respond to stress in the same way, however, notes Daniel Sol an ornithologist at the Centre for Ecological Research and Forestry Applications in Cerdanyola del Vallès, Spain. He and colleagues have for years looked at the differences between big-brained birds, such as crows and parrots, and those with smaller brains, such as chickens and quails. The former survive better in nature and are also more successful at establishing a community in a new environment.

In their new work, they connect brain size to handling stress. Sol; Ádám Lendvai, an evolutionary biologist at the College of Nyíregyháza in Hungary; and colleagues scoured the avian research literature to find studies that had measured corticosterone levels in birds in varying situations. They found 189 reports published before 2010 with comparable corticosterone and whole brain mass measurements for 119 bird species. The analysis, reported in the Proceedings of the Royal Society B, revealed that birds with large brains have lower circulating levels of the stress hormone, which rise only slightly in response to challenging situations, whereas these values can skyrocket in birds on the opposite end of the “brainy” scale.

An enlarged brain might be costly to develop and maintain, but could increase the bird’s ability to face new challenges and cope with unpredictable situations. Higher cognitive skills “can be seen as an alternative mechanism to hormonal responses,” Sol explains. After all, he says, in multiple animal species “learning has long been associated with a reduction in stress.”

(via Wired Science)