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Purinergic receptors are part of a functional signaling system for proliferation and differentiation of human epidermal keratinocytes

Greig A. V, Linge C, Terenghi G, McGrouther D, Burnstock G

J Invest Dermatol. 2003;120, 6:1007-15.

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Abstract

We investigated the expression of P2X5, P2X7, P2Y1 and P2Y2 receptor subtypes in normal human epidermis and in relation to markers of proliferation (PCNA and Ki-67), keratinocyte differentiation (cytokeratin K10 and involucrin) and markers of apoptosis (TUNEL and anticaspase-3). Using immunohistochemistry, we showed that each of the four receptors was expressed in a spatially distinct zone of the epidermis, suggesting different functional roles for these receptors. Functional studies were performed on primary cultures of human keratinocytes and on explanted rat skin, where different P2 receptor subtype agonists and antagonists were applied to cultured keratinocytes or injected subcutaneously into the skin, respectively. An increase in cell number was caused by low doses of the nonspecific P2 receptor agonist ATP, the P2Y2 receptor agonist UTP (p<0.001), and the P2Y1 receptor agonist 2MeSADP (p<0.05). There was a significant decrease in cell number as a result of treatment with the P2X5 receptor agonist ATPgammaS (p<0.001) and the P2X7 receptor agonist BzATP (p<0.001). Suramin caused a significant block in the effect of 100 microm ATP (p<0.01) and 1000 microm ATP (p<0.001) on cell number. These results imply that different purinergic receptors have different functional roles in the human epidermis with P2Y1 and P2Y2 receptors controlling proliferation, while P2X5 and P2X7 receptors control early differentiation, terminal differentiation and death of keratinocytes, respectively.

Bibliographic metadata

Type of resource:
Content type:
Publication type:
Publication form:
Published date:
Journal title:
Volume:
120, 6
Start page:
1007
End page:
15
Pagination:
1007-15
ISI Accession Number:
12787128
General notes:
  • 226724130022-202xJournal Article
Access state:
Active

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:1d7369
Created:
29th August, 2009, 14:08:07
Last modified:
21st January, 2014, 20:24:41

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