Insights into the role of the calcium sensing receptor in epidermal differentiation in vivo.
While the important role of calcium (Ca(++)) signaling is fundamental in epidermal cell physiology, a detailed knowledge of precisely how epidermal cells respond to Ca(++) levels is not clear. Using peptide-specific antibodies that we generated, we set out to evaluate the temporal and spatial distribution pattern of the Ca(++)-sensing receptor (CaSR) during epidermogenesis and to assess its involvement in the mature epidermis (e.g., in acute injury and tumorigenesis). Our data indicate a developmentally regulated expression of CaSR: up-regulation occurs in specific epidermal cells and cell layers in normal development or in response to injury when epidermal cells are induced to undergo commitment and early differentiation events, and down-regulation occurs in terminal differentiation stages. These results provide a new perspective on the role of the CaSR in these processes and describe a novel tool for evaluating Ca(++)-mediated epidermal differentiation.
Arabzadeh
Azadeh
A
Sprott Centre for Stem Cell Research at the Ottawa Hospital Research Institute, Ottawa, ON, K1Y 8L6, Canada.
Troy
Tammy-Claire
TC
Turksen
Kursad
K
D000818:Animals; D020013:Calcium Signaling / Q000502:physiology*; D002273:Carcinogens / Q000494:pharmacology; D002454:Cell Differentiation / Q000502:physiology*; D000078404:Epidermal Cells; D004817:Epidermis / Q000293:injuries / Q000378:metabolism* / Q000503:physiopathology; D007150:Immunohistochemistry; D051379:Mice; D009928:Organ Specificity; D044169:Receptors, Calcium-Sensing / Q000378:metabolism*; D012878:Skin Neoplasms / Q000139:chemically induced / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000009:adverse effects
D002273:Carcinogens; D044169:Receptors, Calcium-Sensing; D013755:Tetradecanoylphorbol Acetate