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Inflammatory Mediators in Xanthelasma Palpebrarum: Histopathologic and Immunohistochemical Study.

ABSTRACT: PURPOSE:To evaluate the expression of inflammatory mediators in xanthelasma palpebrarum. METHODS:In this retrospective histopathologic case-control study, xanthelasma specimens obtained from the private practice and pathology archives of 1 author (R.Z.S.) were analyzed and compared with the blepharoplasty tissues from age- and sex-matched controls. Paraffin-embedded tissue sections were stained with hematoxylin-eosin and CD3, CD20, CD163, cyclooxygenase-1, inducible nitric oxide synthase, matrix metallopeptidase-9, and myeloperoxidase antibodies. Immunostaining was quantified by light microscopy and with a computerized image analysis system of scanned images. RESULTS:Hematoxylin-eosin-stained preparations of xanthelasma specimens demonstrated significantly more intense chronic lymphocytic infiltrate when compared with the control blepharoplasty tissues (p < 0.001). Immunohistochemical studies revealed more intense CD3+ T cell and CD163+ histiocytic infiltrate (11% vs. 5%; p = 0.02 and 28% vs. 5%; p = 0.003, respectively) and increased expression of cyclooxygenase-1 (44% vs. 20% expressing cells; p < 0.001 and 21% vs. 9% strongly expressing cells; p = 0.008) and inducible nitric oxide synthase (43% vs. 26% expressing cells; p = 0.03 and 42% vs. 25% strongly expressing cells; p = 0.02) in xanthelasma specimens compared with control tissues. CONCLUSIONS:The inflammatory milieu in xanthelasma appears to be analogous to descriptions of the early stages of cardiac atherosclerotic plaque formation. These findings may contribute to the understanding of xanthelasma pathogenesis and to the development of potential targeted therapies.

SUBMITTER: Govorkova MS

PROVIDER: S-EPMC6704479 | biostudies-literature | 2018 May/Jun

REPOSITORIES: biostudies-literature

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Inflammatory Mediators in Xanthelasma Palpebrarum: Histopathologic and Immunohistochemical Study.

Govorkova Maria S MS Milman Tatyana T Ying Gui-Shuang GS Pan Wei W Silkiss Rona Z RZ

Ophthalmic plastic and reconstructive surgery 20180501 3

<h4>Purpose</h4>To evaluate the expression of inflammatory mediators in xanthelasma palpebrarum.<h4>Methods</h4>In this retrospective histopathologic case-control study, xanthelasma specimens obtained from the private practice and pathology archives of 1 author (R.Z.S.) were analyzed and compared with the blepharoplasty tissues from age- and sex-matched controls. Paraffin-embedded tissue sections were stained with hematoxylin-eosin and CD3, CD20, CD163, cyclooxygenase-1, inducible nitric oxide s ...[more]

PMID: 28481769

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Project description:ImportancePigmented facial macules on photodamaged skin are a clinical, dermoscopic, and histopathologic challenge.ObjectivesTo clinically and dermoscopically characterize, by means of reflectance confocal microscopy (RCM), ambiguous pigmented facial macules and establish a correlation between RCM, histopathologic, and immunohistochemical findings.Design, setting, and participantsA prospective study of ambiguous pigmented facial macules on photodamaged skin was conducted in a tertiary referral center for dermatology between January 1, 2009, and December 31, 2015. Sixty-one patients with 63 ambiguous pigmented facial macules and 12 control photodamaged facial areas were included in the study. Melanocyte density in 1-mm basal layers was determined in skin biopsy specimens from all lesions stained with hematoxylin-eosin and immunohistochemical markers (melan-A, microphthalmia-associated transcription factor, and SRY-related HMG-box gene 10). Dermoscopic, RCM images, and histopathologic preparations were systematically evaluated for the presence of lentigo maligna (LM) criteria. Confocal evaluation was blinded to clinical and dermoscopic diagnosis. Sensitivity and specificity of RCM for LM diagnosis and ? value to establish correlations between dermoscopy, RCM, and histopathology were performed.Main outcomes and measuresSensitivity and specificity of RCM for LM diagnosis.ResultsOf the 61 patients included in the study, 31 (51%) were women; mean (SD) age was 71.8 (13.1) years. Twenty-four of the 63 (38%) lesions were diagnosed as LM or LM melanoma (LMM) and 39 (62%) as benign pigmented lesions. Reflectance confocal microscopy enhanced the diagnosis of pigmented facial macules with 91.7% sensitivity and 86.8% specificity. Multivariate analysis showed 2 dermoscopic and 2 confocal features associated with LM or LMM: (1) asymmetric follicular pigmentation and targetlike structures, and (2) round, large pagetoid cells and follicular localization of atypical cells, respectively. Continuous proliferation of atypical melanocytes was found in 21 (88%) LM or LMM and in 3 (77%) benign lesions. Asymmetric pigmented follicular openings by dermoscopy correlated with follicular localization of pagetoid cells by RCM (??=?0.499, P?<?.001). The presence of 3 or more atypical cells at the dermal-epidermal junction (DEJ) by RCM correlated with hyperplasia of melanocytes in hematoxylin-eosin sections (??=?0.422, P?<?.001).Conclusions and relevanceReflectance confocal microscopy improves LM diagnosis in photodamaged skin with good histopathologic correlation although false-positive and false-negative cases exist. False-positives obtained with RCM in photodamaged skin are due to the presence of basal melanocyte hyperplasia and intraepidermal Langerhans cells. Histopathologic features of these lesions sometimes are not enough for a definite diagnosis and immunohistochemical studies may be required.

Project description:IntroductionRecent studies have identified subtypes of small cell lung carcinoma (SCLC) defined by the RNA expression of ASCL1, NEUROD1, POU2F3, and YAP1 transcriptional regulators. There are only limited data on the distribution of these markers at the protein level and associated pathologic characteristics in clinical SCLC samples.MethodsThe expression of ASCL1, NEUROD1, POU2F3, and YAP1 was analyzed by immunohistochemistry in 174 patient samples with SCLC. Subtypes defined by these markers were correlated with histologic characteristics, expression of classic neuroendocrine markers (synaptophysin, chromogranin A, CD56, INSM1), and other SCLC markers, including the neuroendocrine phenotype-associated markers TTF-1 and DLL3.ResultsASCL1 and NEUROD1 expression had the following distribution: (1) 41% ASCL1+/NEUROD1-; (2) 37% ASCL1+/NEUROD1+; (3) 8% ASCL1-/NEUROD1+; and (4) 14% ASCL1-/NEUROD1-. On the basis of their relative expression, 69% of cases were ASCL1-dominant and 17% were NEUROD1-dominant. POU2F3 was expressed in 7% of SCLC and was mutually exclusive of ASCL1 and NEUROD1. YAP1 was expressed at low levels, primarily in combined SCLC, and was not exclusive of other subtypes. Both ASCL1-dominant and NEUROD1-dominant subtypes were associated with neuroendocrine markerhigh/TTF-1high/DLL3high profile, whereas POU2F3 and other ASCL1/NEUROD1 double-negative tumors were neuroendocrine markerlow/TTF-1low/DLL3low.ConclusionsThis is the first comprehensive immunohistochemical and histopathologic analysis of novel SCLC subtypes in patient samples. We confirm that ASCL1/NEUROD1 double-negative tumors represent a distinct neuroendocrine-low subtype of SCLC, which is either uniquely associated with POU2F3 or lacks a known dominant regulator. The expression profiles of these markers appear more heterogeneous in native samples than in experimental models, particularly with regard to the high prevalence of ASCL1/NEUROD1 coexpression. These findings may have prognostic and therapeutic implications and warrant further clinical investigation.

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Inflammatory Mediators in Xanthelasma Palpebrarum: Histopathologic and Immunohistochemical Study.

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Inflammatory Mediators in Xanthelasma Palpebrarum: Histopathologic and Immunohistochemical Study.

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