Expression of the Ly6/uPAR-domain proteins C4.4A and Haldisin in non-invasive and invasive skin lesions

TY - JOUR

T1 - Expression of the Ly6/uPAR-domain proteins C4.4A and Haldisin in non-invasive and invasive skin lesions

AU - Kriegbaum, Mette C.

AU - Clausen, Ole P. F.

AU - Lærum, Ole Didrik

AU - Ploug, Michael

PY - 2015/2/27

Y1 - 2015/2/27

N2 - C4.4A and Haldisin belong to the Ly6/uPAR/α-neurotoxin protein domain family. They exhibit highly regulated expression profiles in normal epidermis, where they are confined to early (C4.4A) and late (Haldisin) squamous differentiation. We have now explored if dysregulated expressions occur in non-invasive and invasive skin lesions. In non-invasive lesions, their expression signatures were largely maintained as defined by that of normal epidermis. The scenario was, however, markedly different in the progression towards invasive squamous cell carcinomas. In its non-invasive stage (carcinoma in situ), a pronounced attenuation of C4.4A expression was observed, but upon transition to malignant invasive squamous cell carcinomas, the invasive fronts regained high expression of C4.4A. A similar progression was observed for the early stages of benign infiltrating keratoacanthomas. Interestingly, this transition was accompanied by a shift in the predominant association of C4.4A expression with CK1/10 in the normal epidermis to CK5/14 in the invasive lesions. In contrast, Haldisin expression maintained its confinement to the most-differentiated cells and was hardly expressed in the invasive lesions. Because this altered expression of C4.4A was seen in the invasive front of benign (keratoacanthomas) and malignant (squamous cell carcinomas) neoplasms, we propose that this transition of expression is primarily related to the invasive process.

AB - C4.4A and Haldisin belong to the Ly6/uPAR/α-neurotoxin protein domain family. They exhibit highly regulated expression profiles in normal epidermis, where they are confined to early (C4.4A) and late (Haldisin) squamous differentiation. We have now explored if dysregulated expressions occur in non-invasive and invasive skin lesions. In non-invasive lesions, their expression signatures were largely maintained as defined by that of normal epidermis. The scenario was, however, markedly different in the progression towards invasive squamous cell carcinomas. In its non-invasive stage (carcinoma in situ), a pronounced attenuation of C4.4A expression was observed, but upon transition to malignant invasive squamous cell carcinomas, the invasive fronts regained high expression of C4.4A. A similar progression was observed for the early stages of benign infiltrating keratoacanthomas. Interestingly, this transition was accompanied by a shift in the predominant association of C4.4A expression with CK1/10 in the normal epidermis to CK5/14 in the invasive lesions. In contrast, Haldisin expression maintained its confinement to the most-differentiated cells and was hardly expressed in the invasive lesions. Because this altered expression of C4.4A was seen in the invasive front of benign (keratoacanthomas) and malignant (squamous cell carcinomas) neoplasms, we propose that this transition of expression is primarily related to the invasive process.

U2 - 10.1369/0022155414563107

DO - 10.1369/0022155414563107

M3 - Journal article

C2 - 25414274

SN - 0022-1554

VL - 63

SP - 142

EP - 154

JO - Journal of Histochemistry and Cytochemistry

JF - Journal of Histochemistry and Cytochemistry

IS - 2

ER -