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Langerhans cell histiocytosis (LCH), juvenile xanthogranuloma (JXG) family lesions, and Rosai-Dorfman-Destombes disease (RDD) are now classified by the World Health Organization (WHO) under the heading of histiocytic/dendritic cell neoplasms. Each disease may manifest as a focal lesion, as multiple lesions, or as a widespread aggressive systemic disease with visceral organ involvement. Erdheim-Chester disease (ECD) is a rare systemic disease process of adults with limited cases in children.

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A Childhood Langerhans Cell Histiocytosis With a Novel BRAFN486_T491delinsK Mutation: Good Response to Conventional Chemotherapy.

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January 2025

Department of Pediatrics, West China Second University Hospital, Sichuan University, Sichuan, China.

Langerhans cell histiocytosis (LCH) is characterized genetically by diverse gene mutations of the mitogen-activated protein kinase signaling cascade. BRAFN486_T491delinsK mutation is a rare mutation that involves the β2-αC ring domain, causing activation of the mitogen-activated protein kinase pathway, and is predicted to be resistant to the chemotherapy and BRAFV600E inhibitor in adult LCH cases. Here, we report a childhood LCH case with this novel BRAF mutation and had a good response to conventional chemotherapy.

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Bi-Hormonal Endocrine Cell Presence Within the Islets of Langerhans of the Human Pancreas Throughout Life.

Cells

January 2025

Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON N6A 3K7, Canada.

Bi-hormonal islet endocrine cells have been proposed to represent an intermediate state of cellular transdifferentiation, enabling an increase in beta-cell mass in response to severe metabolic stress. Beta-cell plasticity and regenerative capacity are thought to decrease with age. We investigated the ontogeny of bi-hormonal islet endocrine cell populations throughout the human lifespan.

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Mesenchymal stem cell conditioned medium improves hypoxic injury to protect islet graft function.

Zhong Nan Da Xue Xue Bao Yi Xue Ban

August 2024

Department of Radiology, Third Xiangya Hospital, Central South University, Changsha 410013, China.

Objectives: Islet transplantation is one of the most promising curative methods for type 1 diabetes mellitus (T1DM), but early hypoxic death of the graft post-transplantation impedes successful treatment. To improve the efficacy of islet transplantation and enhance islet cell resistance to hypoxia, reducing hypoxic injury before revascularization is crucial. Mesenchymal stem cells (MSCs) are known to regulate immune responses and protect against hypoxic damage through paracrine mechanisms.

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Herein, we characterized the percentage of tacrolimus to the combined sirolimus and tacrolimus trough levels (tacrolimus %) observed during islet transplant-associated immune suppression therapy with post-transplant skin cancer. Although trough levels of tacrolimus and sirolimus were not different ( = 0.79, 0.

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