Objective To investigate the imaging features of post-transplant lymphoproliferative disorder(PTLD)after allogeneic hematopoietic stem cell transplantation(allo-HSCT).Methods The imaging findings of EB virus-associated PTLD(EBV-PTLD)after allo-HSCT in 8 patients with hematological diseases were retrospectively analyzed,including 1 case with acute lymphoblastic leukemia(ALL),3 cases with acute myeloid leukemia(AML),1 case with myelodysplastic syndrome(MDS)and 3 cases with aplas-tic anemia(AA).All patients were positive for EB virus(EBV)after transplantation.MRI,CT plain scan and enhanced scan were performed to analyze the imaging features of all lesions.Results Central nervous system(CNS)was involved in 5 cases,pharyngeal lymphatic ring and left lacrimal sac was involved in 1 case,liver was involved in 1 case,intraperitoneal and retroperitoneal lymph nodes was involved in 1 case.All patients were pathologically confirmed with PTLD.Conclusion PTLD may involve multiple organs and tissues after hematopoietic stem cell transplantation with different onset time.Timely MRI and CT examination,combined with PTLD screening and EBV detection,can detect and diagnose PTLD lesions in early stage,providing important clinical value.

Objective To investigate the imaging features of post-transplant lymphoproliferative disorder(PTLD)after allogeneic hematopoietic stem cell transplantation(allo-HSCT).Methods The imaging findings of EB virus-associated PTLD(EBV-PTLD)after allo-HSCT in 8 patients with hematological diseases were retrospectively analyzed,including 1 case with acute lymphoblastic leukemia(ALL),3 cases with acute myeloid leukemia(AML),1 case with myelodysplastic syndrome(MDS)and 3 cases with aplas-tic anemia(AA).All patients were positive for EB virus(EBV)after transplantation.MRI,CT plain scan and enhanced scan were performed to analyze the imaging features of all lesions.Results Central nervous system(CNS)was involved in 5 cases,pharyngeal lymphatic ring and left lacrimal sac was involved in 1 case,liver was involved in 1 case,intraperitoneal and retroperitoneal lymph nodes was involved in 1 case.All patients were pathologically confirmed with PTLD.Conclusion PTLD may involve multiple organs and tissues after hematopoietic stem cell transplantation with different onset time.Timely MRI and CT examination,combined with PTLD screening and EBV detection,can detect and diagnose PTLD lesions in early stage,providing important clinical value.

OBJECTIVETo investigate changes in the expression of tight junction (TJ) proteins in the cerebral cortex, hippocampus, heart, lung, and testes of rats after exposure to electromagnetic pulse (EMP).

METHODSEighteen adult male Sprague-Dawley rats were divided into sham and exposure groups. The exposure groups received EMP at 200 kV/m for 200 pulses with a repetition rate of 1 Hz. The expression of TJ proteins (ZO-1, occludin, actin) in the several organs was examined by western blotting.

RESULTSZO-1 levels in the cerebral cortex decreased 1 h and 3 h after EMP exposure compared with sham group (P<0.05). No significant difference was observed for occludin and actin. ZO-1 levels in the hippocampus increased 1 h and 3 h post-exposure (P<0.05), and occludin decreased after 3 h (P<0.05); however, actin was unaffected. ZO-1 levels in the heart increased 3 h post-exposure (P<0.05), occludin decreased 3 h post-exposure (P<0.05), and actin increased 1 h and 3 h post-exposure (P<0.05). ZO-1, occludin and actin levels in the lung decreased compared with those in the sham group (P<0.05). ZO-1 and occludin levels in the testes decreased 1 h and 3 h post-exposure (P<0.05), but actin showed no significant change.

CONCLUSIONExposure to EMP altered the expression levels of TJ proteins, particularly ZO-1, in the organs of adult male rats, which may induce changes in barrier structure and function.

Actins ; genetics ; metabolism ; Animals ; Cerebral Cortex ; cytology ; metabolism ; Electromagnetic Radiation ; Gene Expression Regulation ; radiation effects ; Lung ; cytology ; metabolism ; Male ; Membrane Proteins ; genetics ; metabolism ; Myocardium ; cytology ; metabolism ; Occludin ; Phosphoproteins ; genetics ; metabolism ; Rats ; Rats, Sprague-Dawley ; Testis ; cytology ; metabolism ; Tight Junctions ; metabolism ; Zonula Occludens-1 Protein