This paper describes a morphologically unusual feature occurring in lymph nodes of some aged euthymic animals but mostly athymic animals. It initially consists of small alveole-like excrescences of the cortical wall of the subcapsular sinus. With dilatation, an excrescence becomes an ectasia which expands into the cortex. Observations suggest that ectasias enlarge under the influence of an increased pressure of the afferent lymph of a node. Such condition conceivably results from a greater lymph formation due to inflammation of the drained tissue site, combined with an impairment to the flow of lymph from the subcapsular sinus into medullary sinuses. A probable relation of ectasia formation to immunodeficiency is discussed. This formation results in the atrophy of the affected lymphoid cell populations of a node which likely contributes to aggravate the deficiency of the immune system.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Spatiotemporal Dynamic Immunomodulation by Infection-Mimicking Gels Enhances Broad and Durable Protective Immunity Against Heterologous Viruses.
Adv Sci (Weinh)
January 2025
SKKU Advanced Institute of Nanotechnology (SAINT), Department of Nano Engineering, Department of Nano Science and Technology, School of Chemical Engineering, Biomedical Institute for Convergence at SKKU, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea.
Despite their safety and widespread use, conventional protein antigen-based subunit vaccines face significant challenges such as low immunogenicity, insufficient long-term immunity, poor CD8 T-cell activation, and poor adaptation to viral variants. To address these issues, an infection-mimicking gel (IM-Gel) is developed that is designed to emulate the spatiotemporal dynamics of immune stimulation in acute viral infections through in situ supramolecular self-assembly of nanoparticulate-TLR7/8a (NP-TLR7/8a) and an antigen with tannic acid (TA). Through collagen-binding properties of TA, the IM-Gel enables sustained delivery and enhanced retention of NP-TLR7/8a and protein antigen in the lymph node subcapsular sinus of mice for over 7 days, prolonging the exposure of vaccine components in both B cell and T cell zones, leading to robust humoral and cellular responses.
View Article and Find Full Text PDFSubcutaneous delivery of mesenchymal stromal cells induces immunoregulatory effects in the lymph node prior to their apoptosis.
Stem Cell Res Ther
November 2024
Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia.
Background: Mesenchymal stromal cell (MSC) therapy commonly involves systemic infusion of MSCs, which undergo apoptosis in the lung and induce immunoregulatory macrophages that reduce disease. The relevance of this mode of action, however, is yet to be determined for MSCs administered via other routes. Here, we administered MSCs via subcutaneous (SC) injection into inflamed tissue and investigated the immunomodulatory effects on the local lymph node (LN), which is a major site for the initiation and regulation of immune responses.
View Article and Find Full Text PDFInjectable Genetic Engineering Hydrogel for Promoting Spatial Tolerance of Transplanted Kidney in Situ.
Adv Sci (Weinh)
December 2024
Kidney Disease Center, The First Affiliated Hospital, Zhejiang University School of Medicine, Key Laboratory of Kidney Disease Prevention and Control Technology, National Key Clinical Department of Kidney Diseases, Institute of Nephrology, Zhejiang University, Zhejiang Clinical Research Center of Kidney and Urinary System Disease, Hangzhou, Zhejiang, 310003, P. R. China.
The establishment of a tolerant space to realize the co-stimulation of cytokines and contact-dependent molecules remain challenging in allotransplant. Here, an injectable genetically engineered hydrogel (iGE-Gel) is reported, which developed with a multivalent network of FOXP3 engineered extracellular vesicles (Foe-EVs) through the hydrophobic interaction between stearic acid modified hyaluronic acid (HASA) and the membrane phospholipids of extracellular vesicles (EVs). The iGE-Gel exhibited self-healing properties, injectability and biocompatibility.
View Article and Find Full Text PDFTransformable Gel-to-Nanovaccine Enhances Cancer Immunotherapy via Metronomic-Like Immunomodulation and Collagen-Mediated Paracortex Delivery.
Adv Mater
November 2024
SKKU Advanced Institute of Nanotechnology (SAINT), Department of Nano Engineering, Department of Nano Science and Technology, School of Chemical Engineering, and Biomedical Institute for Convergence at SKKU, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea.
Article Synopsis
- The effectiveness of vaccines is influenced by how and when they are delivered, with traditional methods often being less effective due to limited targeting of lymph nodes.
- A new system called bioadhesive immune niche domain (BIND) uses a targeted, gradual delivery of a specific nanovaccine that helps enhance the retention of T-cells in lymph nodes and boosts immune responses.
- This innovative approach, combined with other therapies, significantly improves cancer immunotherapy outcomes by altering the tumor microenvironment to support stronger, long-lasting immune responses.
Multiscale computational analysis of the steady fluid flow through a lymph node.
Biomech Model Mechanobiol
December 2024
School of Mathematics and Statistics, University of Glasgow, Glasgow, UK.
Lymph Nodes (LNs) are crucial to the immune and lymphatic systems, filtering harmful substances and regulating lymph transport. LNs consist of a lymphoid compartment (LC) that forms a porous bulk region, and a subcapsular sinus (SCS), which is a free-fluid region. Mathematical and mechanical challenges arise in understanding lymph flow dynamics.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!