Pattern of mRNA expression of beta-defensins in basal cell carcinoma

Abstract

Background: Although the human beta-defensins hBDs today seem to have diverse functional activities in innate antimicrobial immunity, a few reports also indicated an altered expression of these antimicrobial peptides (AMPs) in tissues of cancers such as oral squamous cell carcinoma. The present work was aimed on the study of hBD gene expression in basal cell carcinoma (BCC) which is the most common cancer in humans.

Methods: Twenty-two non-ulcerated BCCs (12 nodular type, 10 superficial type) have been analysed for the presence of hBD (1-3) mRNA by quantitative real-time RT-PCR. As controls, non-lesional skin specimens of BCC patients as well as samples of healthy subjects were assessed by RT-PCR.

Results: hBD-1 levels in healthy controls and non-lesional skin of BCC patients were significantly (P < 0.05) higher than the levels observed in tumour tissue. Moreover, BCCs showed significantly (P < 0.05) increased mRNA expression of hBD-2 as compared to controls. There was no significant (P > 0.05) difference between lesional mRNA levels for hBD-3 and those levels observed in controls. The mRNA expression of hBDs (1-3) found in nodular and superficial BCCs did not significantly (P > 0.05) differ.

Conclusion: The gene expression patterns of hBD-1 and hBD-2 are for the first time shown to be significantly altered in non-ulcerated BCCs as compared to intra-individual and inter-individual controls, respectively. The present findings may indicate that beside the antimicrobial activity of AMPs, hBDs may also play a role in the pathogenesis of BCC. However, functional and immunohistological studies investigating hBDs in patients with BCC are needed to confirm our data.

Figure 1

PCR products of hBDs and housekeeping gene (GAPDH) on 2% agarose gels.

Figure 2

Diagram showing levels of median mRNA expression of hBDs in lesional and non-lesional skin of 22 patients with non-ulcerated basal cell carcinoma. hBD mRNA expression in 27 healthy controls is also shown. mRNA expression levels given on the y-axis correspond to the re-transformed logarithms of the ΔCt values.