PubMed Health⌕ Search

Biomedical subjects

Edgar Dippel

Publications and source records attributed to Edgar Dippel.

11 recordsLinked to original sources
PubMed2007

Multiple juvenile xanthogranulomas successfully treated with CO laser.

Juvenile xanthogranulomas are a rare disease entity within the spectrum of cutaneous non-Langerhans cell histiocytoses characterized by single or multiple cutaneous xanthogranulomas without further organ involvement. A 16-year-old girl developed multiple xanthogranulomas in various skin regions, especially the trunk and the flexural areas, over a period of 6 months. The clinical diagnosis was confirmed by H&E histology, showing a histiocytic infiltrate admixed with foam cells and Touton giant cells, and by immunohistochemistry using anti-bodies to stabilin-1 whose expression is highly specific for cutaneous non-Langerhans cell histiocytoses. No diabetes insipidus, pituitary hyperplasia or paraproteinemia were observed. Skin lesions were treated with a CO(2) laser and did not reappear during a 5 years follow-up period.

Adolescent↗
PubMed2006

Identification of HLA class I dependent immunogenic peptides from clonotypic TCRbeta expressed in cutaneous T-cell lymphoma.

The clonotypic T-cell receptor (TCR) is a potential target antigen for specific immunotherapy of cutaneous T-cell lymphoma (CTCL). We identified T-cell epitopes from the rearranged TCR beta chain of the malignant T-cell population by the "reverse immunology" approach. Peptide-specific T-cell lines were generated against predicted epitopes and tested for the recognition of tumor cells and cells transfected with the full-length DNA coding for TCRV beta chain. Two peptides derived from the clonotypic TCRVbeta of a HLA-A2 positive patient could induce peptide-specific T cells from peripheral blood mononuclear cells of healthy donors and the patient as assessed by IFN-gamma ELISpot assay. Furthermore, the reactive CTLs efficiently recognized autologous Sézary tumor cells, as well as HLA-A2 positive 293 cells transfected with recombinant plasmid expressing the corresponding TCRVbeta29 protein. Similar results were obtained in a HLA-A3+ patient for TCRVbeta7-Jbeta2.7. In conclusion, our experiments show that the TCR beta chain harbors epitopes suitable as targets for specific vaccination which might be a promising approach for the specific immunotherapy of cutaneous T-cell lymphoma patients.

Epitopes↗
PubMed2006

Immunoscreening of a cutaneous T-cell lymphoma library for plasma membrane proteins.

Cutaneous T-cell lymphomas (CTCL) belong to non-Hodgkin lymphomas, which are primarily manifested in the skin and mostly exhibit a T-helper memory phenotype. Mycosis fungoides (MF) and the leukemic variant Sézary syndrome (SzS) are the most common forms of CTCL. The aim of this study was to identify CTCL surface proteins with a tumor specific expression profile. A plasma membrane enriched fraction of the CTCL cell line HuT78 was used for immunization of two rabbits. Subsequently, a CTCL cDNA phage library was screened by a new variant of the SEREX method (serological identification of antigens by recombinant expression cloning) using the polyspecific rabbit antisera instead of patients' sera. Isolated reactive transfectants were sequenced and 42 different genes identified including four known plasma membrane proteins: Ligatin, HLA-A, integrin alpha4 and MT5-MMP. The level of transcripts of the matrix metalloproteinase MT5-MMP was diminished in MF tumor specimens. MT5-MMP normally occurs in several different protein variants. Western blot analysis revealed that activated MT5-MMPs were reduced in tumor specimens, whereas the amounts of most of the inactivated variants were unchanged. The amount of mRNA coding for the adhesion protein integrin alpha4 was not altered in tumor specimens in comparison to controls when analyzed by quantitative real-time PCR analysis. Ku86, known to be predominantly located in the nucleus and cytosol, was frequently detected during the SEREX screening. Western blot analysis revealed higher protein amounts of Ku86 in HuT78 than in control cells. In addition, we could show, that Ku86 can also be detected in lipid rafts of CTCL cells as it has been described for other tumor types. Thus, Ku86 might be involved in homo- and heterotypic adhesion steps of CTCL tumor cells and might protect these cells against apoptosis triggered by irradiation as it was suggested for multiple myeloma cells. The design of this study enabled screening for all proteins on the plasma membrane, irrespectively of whether these are directly anchored within the membrane or associated with other membrane proteins. Further analysis will unravel whether the list of identified proteins harbors candidates, which might be accessible for antibodies from outside the cell.

Animals↗
PubMed2006

Cutaneous leiomyosarcoma with myxoid alteration arising in a setting of multiple cutaneous smooth muscle neoplasms.

BACKGROUND: Cutaneous leiomyomas and leiomyosarcomas are rare tumors that originate from the arrector muscle of hair follicles or the smooth muscle of blood vessels. CASE REPORT: A 74-year-old male presented with a single, erythematous nodule on the left upper arm. This lesion developed within the excision scar of a piloleiomyoma that had been excised 3 years ago. Additionally, physical examination revealed a tender nodule on the right ear. RESULTS: Histological examination showed a cutaneous leiomyosarcoma with myxoid alteration on the upper arm and an angioleiomyoma on the right ear. CONCLUSION: Myxoid leiomyosarcomas have exclusively been reported in the uterus and gastrointestinal tract, but not in the skin. Here, we describe a case of cutaneous leiomyosarcoma with myxoid alteration that developed in the excision scar of a piloleiomyoma and was accompanied by a cutaneous angioleiomyoma in a different location.

Aged↗
PubMed2003

Atypical generalized eruptive histiocytosis associated with acute monocytic leukemia.

Histiocytoses are diseases caused by proliferation of either dendritic cells/Langerhans cells or of monocytes/macrophages. Generalized eruptive histiocytosis belongs to the cutaneous non-Langerhans cell histiocytoses and is a rare monocyte-macrophage proliferative disorder that usually follows a benign clinical course. We present the case of a 59-year-old man who presented with a 7-month history of progressively developing erythematous macules and slightly elevated papules widely distributed over the trunk, neck, face, and thighs. Ultrastructurally, no Birbeck granules were observed, and immunochemistry did not reveal any S-100 protein or CD1a antigen in any of the lesional cells, excluding Langerhans cell histiocytosis. In addition, the histiocytic infiltrate in the skin of our patient was shown to strongly express MS-1 high molecular weight protein, a marker described as highly characteristic for cutaneous non-Langerhans cell histiocytoses. Bone-marrow smear examination and flow cytometric analysis revealed monocytic leukemia. This is the second report of generalized eruptive histiocytosis associated with acute monocytic leukemia. We discuss the differential diagnoses of the clinical picture and stress that this benign cutaneous disorder may indicate an underlying hematologic malignancy.

Back↗
PubMed2003

Common clonal T-cell origin in a patient with T-prolymphocytic leukaemia and associated cutaneous T-cell lymphomas.

An unusual course was observed in a patient with indolent T-prolymphocytic leukaemia (T-PLL) who subsequently developed mycosis fungoides (Mf), lymphomatoid papulosis (LyP) and cutaneous CD30+ anaplastic large cell lymphoma (ALCL). Polymerase chain reaction analysis demonstrated identical monoclonal T-cell receptor-beta and -gamma gene rearrangements in all the different clinical entities. Furthermore, cytogenetic studies revealed the same aberrant clone with trisomy of chromosome 8 in T-PLL and ALCL cells. This unique observation suggests that in T-PLL, the leukaemic cells might undergo secondary transformation, subsequently resulting in different phenotypes of cutaneous T-cell lymphoma.

Aged↗
PubMed2002

Clonal T cell receptor gamma-chain gene rearrangement by PCR-based GeneScan analysis in the skin and blood of patients with parapsoriasis and early-stage mycosis fungoides.

Cutaneous T cell lymphoma (CTCL) and reactive T cell skin diseases represent opposite ends of a spectrum of diseases ranging from overtly malignant to persistently benign. Within this spectrum, the parapsoriasis group is not clearly defined regarding malignant potential. In contrast to consistent findings in advanced-stage CTCL, clonality analysis of parapsoriasis has produced conflicting results in previous studies. As T cell receptor gamma-chain polymerase chain reaction GeneScan analysis (TCR-gamma-PCR-GSA) stands out by its sensitivity, its accuracy in size determination of PCR products, its capacity to identify false positives by repeated analysis and its easy applicability, this approach was used to analyse the clonality status of 41 patients with borderline T cell lymphoproliferative skin diseases, including parapsoriasis (n=27) and early-stage mycosis fungoides (MF) (n=14). A monoclonal T cell infiltrate was demonstrated by repeated TCR-gamma-PCR-GSA in lesional skin specimens in 19.2% of parapsoriasis patients and in 66.6% of early-stage MF cases (p=0.013). In peripheral blood, a monoclonal T cell population was found in a similar percentage of parapsoriasis and of early-stage MF patients (26.7% versus 12.5%; p=0.611). A detailed analysis of parapsoriasis subentities, namely small and large plaque parapsoriasis, and parapsoriasis lichenoides, revealed monoclonality in 2(6)/2(5), 3(14)/2(8) and 0(6)/0/(3) of the skin and peripheral blood specimens, respectively. The high detection rate of false positive cases by repeated analysis (20-37.5%) provides a corrected perspective for the high rates of dominant T cell clones found by others in the peripheral blood of such patients. From the results obtained, three major conclusions can be drawn: firstly, CTCL is clearly associated with detection of monoclonality, even in its early stages; secondly, monoclonality is not a prerequisite for potential CTCL precursor entities; and thirdly, recirculating malignant T cells identical to the skin clone are not readily detected in parapsoriasis or early-stage MF, but may rather indicate disease progression.

Adult↗