The new Pan-American Neuroendocrine Society

Abstract

The new Pan-American Neuroendocrine Society already has an official journal, which of course is the Journal of Neuroendocrinology (JNE). This journal has been the primary presenter of the remarkable expansion of this field since 1989 – documenting its long history and ongoing development. The word Neuro-Endocrinologie, with the hyphen, first appeared in French in 1946 as the title of the enormous (1086 pages) book by Roussy and Mosinger (1).

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Characterization of CD45RO+ Memory T Lymphocytes in Keloid Disease

Abstract

Background

Memory T cells, a highly effective subset of T lymphocytes, have been reported to be involved in many inflammatory skin disorders. However, the potential role of memory T cells in keloid disease (KD) remains unclear.

Objectives

Due to their important role in regulating inflammation, we investigated the characteristics of CD45RO⁺ memory T cells (mT) in KD.

Methods

Primary cutaneous cells were isolated from keloid scars and normal skin by enzymic digestion. Combined with peripheral blood mononuclear cells (PBMCs) isolated from a related blood sample, flow cytometry was applied to identify the phenotypic and functional abnormalities of memory T cells in KD.

Results

We observed that the majority of T lymphocytes in keloid scars had the memory phenotype, and a greater number of the CD8⁺ mT in keloid scars produced lower levels of TNF-α. This abnormal cytokine production was even more distinct in FOXP3^-CD8^- mT, with lower TNF-α production and enhanced IFN-γ production. Furthermore, FOXP3⁺CD8^- mT in keloid scars were abnormal, including showing reduced CD25 and CTLA-4 expression and IL-10 production. In addition, a significant decrease in the number of CD4⁺CD25^highFOXP3⁺ regulatory T cells was identified in patients with multiple keloid scars. We also found that there was significantly increased infiltration of CD103⁺CD8⁺ mT in keloid scars.

Conclusions

Our findings preliminarily elucidate the abnormalities of CD45RO⁺ memory T cells in keloid scars and provide early evidence that a disrupted T cell response contributes to the progression of KD.

This article is protected by copyright. All rights reserved.

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Impaired Langerhans’ cell migration in psoriasis is due to an altered keratinocyte phenotype induced by interleukin-17

Abstract

Psoriasis is a common skin condition driven by increased expression of interleukin (IL)-17. Langerhans' cells (LC) are epidermal dendritic cells that regulate cutaneous immune responses. Within uninvolved skin of patients with psoriasis, LC display impaired migration from the epidermis. Here the role of keratinocytes (KC) in the regulation of LC function, and the response of KC to IL-17 has been investigated. Keratinocytes were cultured from the uninvolved skin of psoriasis patients and healthy individuals with or without IL-17 treatment and the conditioned medium examined for its ability to alter LC function in an ex vivo human skin explant model. Furthermore, we examined the effect of IL-17 on LC mobilisation in psoriasis by neutralising IL-17 in the same skin explant model. We found that conditioned medium from psoriasis KC inhibited LC migration in healthy skin. Moreover, conditioned medium from healthy KC treated with IL-17 also inhibited healthy LC migration. Finally, neutralising IL-17 in psoriasis skin resulted in enhanced LC migration. Collectively, these data suggest that an altered KC secretome, driven by increased expression of IL-17, is responsible for impaired LC migration in uninvolved skin of patients with psoriasis.

This article is protected by copyright. All rights reserved.

http://ift.tt/2itZldu

Characterization of CD45RO+ Memory T Lymphocytes in Keloid Disease

Abstract

Background

Memory T cells, a highly effective subset of T lymphocytes, have been reported to be involved in many inflammatory skin disorders. However, the potential role of memory T cells in keloid disease (KD) remains unclear.

Objectives

Due to their important role in regulating inflammation, we investigated the characteristics of CD45RO⁺ memory T cells (mT) in KD.

Methods

Primary cutaneous cells were isolated from keloid scars and normal skin by enzymic digestion. Combined with peripheral blood mononuclear cells (PBMCs) isolated from a related blood sample, flow cytometry was applied to identify the phenotypic and functional abnormalities of memory T cells in KD.

Results

We observed that the majority of T lymphocytes in keloid scars had the memory phenotype, and a greater number of the CD8⁺ mT in keloid scars produced lower levels of TNF-α. This abnormal cytokine production was even more distinct in FOXP3^-CD8^- mT, with lower TNF-α production and enhanced IFN-γ production. Furthermore, FOXP3⁺CD8^- mT in keloid scars were abnormal, including showing reduced CD25 and CTLA-4 expression and IL-10 production. In addition, a significant decrease in the number of CD4⁺CD25^highFOXP3⁺ regulatory T cells was identified in patients with multiple keloid scars. We also found that there was significantly increased infiltration of CD103⁺CD8⁺ mT in keloid scars.

Conclusions

Our findings preliminarily elucidate the abnormalities of CD45RO⁺ memory T cells in keloid scars and provide early evidence that a disrupted T cell response contributes to the progression of KD.

This article is protected by copyright. All rights reserved.

http://ift.tt/2zVmixF

Impaired Langerhans’ cell migration in psoriasis is due to an altered keratinocyte phenotype induced by interleukin-17

Abstract

Psoriasis is a common skin condition driven by increased expression of interleukin (IL)-17. Langerhans' cells (LC) are epidermal dendritic cells that regulate cutaneous immune responses. Within uninvolved skin of patients with psoriasis, LC display impaired migration from the epidermis. Here the role of keratinocytes (KC) in the regulation of LC function, and the response of KC to IL-17 has been investigated. Keratinocytes were cultured from the uninvolved skin of psoriasis patients and healthy individuals with or without IL-17 treatment and the conditioned medium examined for its ability to alter LC function in an ex vivo human skin explant model. Furthermore, we examined the effect of IL-17 on LC mobilisation in psoriasis by neutralising IL-17 in the same skin explant model. We found that conditioned medium from psoriasis KC inhibited LC migration in healthy skin. Moreover, conditioned medium from healthy KC treated with IL-17 also inhibited healthy LC migration. Finally, neutralising IL-17 in psoriasis skin resulted in enhanced LC migration. Collectively, these data suggest that an altered KC secretome, driven by increased expression of IL-17, is responsible for impaired LC migration in uninvolved skin of patients with psoriasis.

This article is protected by copyright. All rights reserved.

http://ift.tt/2itZldu

Association of Burnout With Emotional Intelligence and Personality in Surgical Residents: Can We Predict Who Is Most at Risk?

Publication date: Available online 1 December 2017
Source:Journal of Surgical Education
Author(s): Brenessa Lindeman, Emil Petrusa, Sophia McKinley, Daniel A. Hashimoto, Denise Gee, Douglas S. Smink, John T. Mullen, Roy Phitayakorn
ObjectivesBurnout is common among surgical residents and may be related to personality characteristics, emotional intelligence (EI), or work experiences.DesignLongitudinal cohort study over 1 year.SettingTertiary academic medical centers in the Northeast.ParticipantsAll general surgery residents in 2 programs (n = 143) were invited to complete an electronic survey at 3 time points; 88, 64, and 69 residents completed the survey (overall response rate 52%).ResultsSevere burnout was observed in 51% of residents (n = 41). Higher scores were associated with female sex (p = 0.02). Burnout scores were highest at the beginning and end of the academic year; EI and personality scores remained stable. On bivariate analysis, high EI score (p < 0.001), agreeableness and emotional stability personality features (p = 0.003), and positive job experiences (p < 0.01) were protective against burnout. Higher EI and positive work experiences were independent predictors of lower burnout (p < 0.01) after multivariable adjustment.ConclusionsSurgical residents have high levels of burnout. Higher EI and positive work experiences are associated with lower burnout. Focused interventions to improve EI and optimize the work environment may prevent or lessen burnout.



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Numéro 10/2017. Questions

Publication date: Available online 20 November 2017
Source:Revue des Maladies Respiratoires





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