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Obscure Immune Cells Thwart Ticks
ScienceNOW ^ | July 26, 2010 | Mitch Leslie

Posted on 07/30/2010 11:36:13 PM PDT by neverdem

Enlarge Image
sn-ticks.jpg
Resistance isn't futile. Immune cells called basophils help prevent ticks from drinking their fill of blood
Credit: Thinkstock

Rare in the body and hard to study, immune cells called basophils have long gotten short shrift from researchers. But a study now shows that basophils help repel bloodthirsty ticks that can spread lethal diseases. The work also introduces a new method for teasing out further immune functions of the often-overlooked cells.

Many animals develop some resistance to ticks the first time the parasites feast on their blood. During later feedings, fewer ticks latch on to resistant animals, and parasites that do attach sup less blood and sometimes even die. Resistance provides another benefit, reducing the odds that ticks will transmit pathogens to their hosts. Some evidence indicated that basophils play a role in tick resistance, but other research pointed to different cells called mast cells. So identifying the key protector has been difficult.

In the new work, immunologist Hajime Karasuyama of the Tokyo Medical and Dental University Graduate School in Japan and colleagues tracked basophils in mice troubled by ticks. When animal were first attacked by the parasites, the cells rarely homed in on tick bites. But if the animals were on their second infestation, the basophils, which normally circulate in the blood, swarmed to the bites and huddled around the parasites' mouth parts. The team then experimented with two ways to temporarily remove the cells from a mouse's circulation. First, the researchers used an established method, injecting mice with antibodies that glom onto basophils. Tick resistance disappeared in these rodents. These antibodies, however, also eliminate mast cells, which made it impossible to determine which cells were providing the benefit. To target basophils, the researchers devised a new technique: they genetically engineered mice so that their basophils carried a receptor for the toxin produced by the diphtheria bacterium. Giving such a mouse a dose of diphtheria toxin destroys the animal's basophils for 5 to 6 days—and banishes resistance to ticks, the scientists report today in The Journal of Clinical Investigation . "Now, we know that the basophil is quite important to acquired tick resistance," says Karasuyama.

Mast cells are also essential for tick resistance, the researchers showed. The team suggests that basophils are necessary to trigger the response, whereas both kinds of cells help turn away ticks. Whether mast cells and basophils collaborate or operate independently to foil the parasites is still a mystery. The tick work is part of a surge of new research on basophils, some of it suggesting that they orchestrate immune responses to parasitic worms and raise the alarm during bacterial infections. The lack of a method for selectively eliminating basophils, leaving mast cells intact, had slowed studies of their functions. But immunologist Donald MacGlashan of Johns Hopkins University School of Medicine in Baltimore, Maryland, says the genetically modified mice created by Karasuyama's team are a "fabulous tool" to probe what else these elusive cells do in the body.


TOPICS: Culture/Society; News/Current Events; Testing
KEYWORDS: acquiredimmunity; basophils; immunology; mastcells
The link goes to a FReebie.
1 posted on 07/30/2010 11:36:20 PM PDT by neverdem
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To: neverdem

wouldn’t it be cool to have a gene that produces DEET?


2 posted on 07/30/2010 11:37:54 PM PDT by HiTech RedNeck (I am in America but not of America (per bible: am in the world but not of it))
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To: neverdem

Wow, I would have guessed eosinophils were involved in this.


3 posted on 07/30/2010 11:48:34 PM PDT by struwwelpeter
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To: Mother Abigail; EBH; vetvetdoug; Smokin' Joe; Global2010; Battle Axe; null and void; ...

immunology ping


4 posted on 07/30/2010 11:51:49 PM PDT by neverdem (Xin loi minh oi)
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To: neverdem

Dang it... if this is real there ought to be a way to immunize yourself...

I hate Ticks ... but they like me, they get in my gloves and attach themselves between my thumb and finger ... even after they are removed their bites itch for what seems like forever...

TT


5 posted on 07/30/2010 11:55:56 PM PDT by TexasTransplant (I don't mind liberals... I hate liars...there just tends to be a high degree of overlap)
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To: neverdem

Basically... where can I get the shot or the pill or whatever
TT


6 posted on 07/30/2010 11:58:03 PM PDT by TexasTransplant (I don't mind liberals... I hate liars...there just tends to be a high degree of overlap)
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To: struwwelpeter
Wow, I would have guessed eosinophils were involved in this.

That's not unreasonable, but it did not say that they were not. It just supports a function of basophils in acquired immunity.

7 posted on 07/30/2010 11:59:38 PM PDT by neverdem (Xin loi minh oi)
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To: neverdem

Thats nothing, any Obama cells will kill jobs and America..


8 posted on 07/31/2010 3:32:44 AM PDT by aeonspromise
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To: neverdem

I woke up in the night because a tick was crawling around on my arm, he didn’t bite me. (Damn dogs)


9 posted on 07/31/2010 6:50:12 AM PDT by Ditter
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To: neverdem

I’ve had a number of ticks attached to me since we have dogs and woods all around us. We also have a large deer population. So far, no tick-bourne diseases, knock wood. I’m not sure why, since my husband and dogs have tested positive for Lyme disease, and my husband was on antibiotics for it two years ago.


10 posted on 07/31/2010 6:56:18 AM PDT by trisham (Zen is not easy. It takes effort to attain nothingness. And then what do you have? Bupkis.)
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To: Ditter

I hear you. That’s happened to me 4-5 times at least.


11 posted on 07/31/2010 6:57:01 AM PDT by trisham (Zen is not easy. It takes effort to attain nothingness. And then what do you have? Bupkis.)
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To: neverdem

Wow!


12 posted on 07/31/2010 9:43:24 AM PDT by null and void (We are now in day 553 of our national holiday from reality. - 0bama really isn't one of US.)
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