Stories about: itch

Poison ivy and psoriasis: The treatment we’ve been itching for?

poison ivy psoriasis target CD1a
Poison ivy, psoriasis, eczema and other inflammatory skin conditions could have a shared targeted treatment. (Jessica Kim/Winau Lab)

The skin is a natural barrier against pathogens and harmful chemicals. But it isn’t bulletproof: contact allergens like poison ivy can trigger an immune response causing severe inflammation, itching and tissue damage. Mechanistically, what happens is that Langerhans cells — certain antigen-presenting cells in the immune system — initiate a chain reaction. This rallies helper T cells to the area, causing skin inflammation.

A protein called CD1a (Cluster of Differentiation 1a) has been thought to be part of this reaction. But until recently, its role was poorly understood, at least in part because there was no good test model. Research in Nature Immunology now suggests that targeting CD1a could lead to new therapies for poison ivy and other inflammatory skin conditions like psoriasis and eczema.

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Selectively silencing itch: Itch-specific nerves let in relief

Illustration: David Roberson
Illustration: David Roberson

This post originally appeared in longer form on Harvard Medical School’s news site. Try not to scratch when you read it.

There’s itch, and then there’s itch.

New research has revealed distinct sets of itch-generating neurons that explain why current itch therapies often fail. It also suggests new ways to selectively silence itch.

“We think this [research] has therapeutic implications,” says Clifford Woolf, PhD, director of the F.M. Kirby Neurobiology Center at Boston Children’s Hospital and professor of neurology at Harvard Medical School (HMS).

While itch is more aggravating than life-threatening, Woolf and HMS graduate student David Roberson hope their work might one day ease the torment itch can cause, particularly in children.

“If you go into the pediatric immunology wards, you see little kids with their hands in mittens or sometimes tied down because they scratch themselves to a point where they damage themselves,” says Woolf.

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