RESUMO
BACKGROUND/AIMS: There is a need for development of non-invasive methods to improve early diagnosis and screening of suspected malignant lesions. Phase-contrast X-ray microscopy (PCXM) has potential to reveal the structures inside soft tissues, and fine details can be observed without any staining or contrast-enhancing cell preparation. We aimed to investigate the possibility that PCXM can be used to explore the microscopic details of basal cell carcinoma (BCC). METHODS: Paraffin blocks of specimens from patients with basal cell carcinoma were cut with 30 microm thickness for PCXM imaging. Experiments were performed at the International Consortium of Phase Contrast Imaging and Radiology (ICPCIR) (7B2) beamline of the Pohang light source in Korea. The PCXM images were achieved by using coherent hard X-rays from a synchrotron source with no monochromatization. RESULTS: We could obtain images with clear edge enhancement by PCXM. The images taken with this technique showed clear anatomic details of organelles in normal skin such as epidermis, dermis and skin appendages. Most of cancerous lesions were clearly differentiated from adjacent normal tissues and the images closely corresponded to those obtained with low-magnification optical microscopy. CONCLUSION: In this pilot study, we successfully demonstrated that synchrotron PCXM could be used for radiological imaging of BCC with great anatomic details.
Assuntos
Neoplasia de Células Basais/diagnóstico por imagem , Neoplasias Cutâneas/diagnóstico por imagem , Pele/diagnóstico por imagem , Idoso , Desenho de Equipamento , Feminino , Humanos , Processamento de Imagem Assistida por Computador , Masculino , Microscopia de Contraste de Fase/instrumentação , Microscopia de Contraste de Fase/métodos , Pessoa de Meia-Idade , Neoplasia de Células Basais/patologia , Projetos Piloto , Radiografia , Pele/patologia , Neoplasias Cutâneas/patologia , Síncrotrons , Raios XRESUMO
In contrast to the classical HLA class Ia molecules, the nonclassical HLA-G primary transcript is alternatively spliced to generate several mRNAs that encode four membrane-bound and three soluble isoforms. This study demonstrated that the soluble form of HLA-G can also be generated by metalloproteinase-dependent shedding at post-translational level. These soluble HLA-G1 molecules generated by the cleavage of membrane-bound HLA-G1 associate with beta2-microglobulin and contain bound peptides that are stable at physiological conditions. This report further showed that the soluble HLA-G1 is able to protect HLA class I-negative K562 cells from NK lysis, suggesting that soluble HLA-G could act as an immunoregulator in NK cell recognition and possibly in other immune responses.