Gel-forming mucins are large, high molecular weight, and heavily O-glycosylated proteins that are responsible for the rheological properties of mucus gel. Among them, the mucin MUC5B has been implicated in breast cancer and cystic fibrosis. We obtained a new polyclonal serum, named CP1, which was isolated from a rabbit immunized with a mouse Muc5b peptide. The immunoprofile of Muc5b was determined on paraffin-embedded and frozen mouse tissue sections and showed a similar expression pattern in mouse to that in the human. The "nonmammary" mucin Muc5b was detected in all mammary tumors analyzed from MMTV-ras mice, suggesting that the CP1 antibody is a valuable tool for investigating the involvement of this mucin in mammary cancer. We also found that uninfected Cftr( -/- ) mice harbored more Clara cells, which were Muc5b-positive, than did their wild-type control littermates. The number of Muc5b-positive cells increased in Cftr( -/- ) mice infected experimentally with Pseudomonas aeruginosa, and the mice developed mucus plugs in their bronchi and bronchioles with a high frequency of Muc5b content (87%, Cohen's kappa = 0.82; p < 0.0001). These findings suggest that mice genetically deficient in the Cftr gene are predisposed to develop mucus plugs and that MUC5B may provide a valuable target for decreasing mucus viscosity in cystic fibrosis.
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http://dx.doi.org/10.1007/s00418-011-0872-5 | DOI Listing |
Arch Pharm Res
January 2025
Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea.
Despite significant progress in the field of human breast cancer research and treatment, there is a consistent increase in the incidence rate of 0.5 percent annually, posing challenges in the development of effective novel therapeutic strategies. The failure rate of drugs in clinical trials stands at approximately 95%, primarily attributed to the limitations and lack of reliability of existing preclinical models, such as mice, which do not mimic human tumor biology.
View Article and Find Full Text PDFCancer Immunol Immunother
January 2025
Department of General Surgery, Shengjing Hospital of China Medical University, ShenyangLiaoning Province, 110004, China.
Myeloid cells accumulate extensively in most tumors and play a critical role in immunosuppression of the tumor microenvironment (TME). Like T cells, myeloid cells also express immune checkpoint molecules, which induce the immunosuppressive phenotype of these cells. In this review, we summarize the tumor-promoting function and immune checkpoint expression of four types of myeloid cells: macrophages, neutrophils, dendritic cells, and myeloid-derived suppressor cells, which are the main components of the TME.
View Article and Find Full Text PDFSci Rep
January 2025
Laboratory of Veterinary Pharmacology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu , Tokyo, 183-8509, Japan.
Organoids are stem cell-derived three-dimensional tissue cultures composed of multiple cell types that recapitulate the morphology and functions of their in vivo counterparts. Organ-on-a-chip devices are tiny chips with interconnected wells and channels designed using a perfusion system and microfluidics to precisely mimic the in vivo physiology and mechanical forces experienced by cells in the body. These techniques have recently been used to reproduce the structure and function of organs in vitro and are expected to be promising alternatives for animal experiments in the future.
View Article and Find Full Text PDFFront Immunol
January 2025
Alexander Silberman Institute of Life Science, The Hebrew University of Jerusalem, Jerusalem, Israel.
Maternal immunization is an important tool directed against a variety of infectious maladies in the offspring. A complementary, but less explored area is the use of maternal immunization in the prevention and treatment of childhood cancers. This in part stems from the lack of adequate experimental model systems.
View Article and Find Full Text PDFDiscoveries (Craiova)
September 2024
Department of Oncopathology, Homi Bhabha Cancer Hospital (HBCH) and Mahamana Pandit Madan Mohan Malviya Cancer Centre (MPMMCC), Tata Memorial Centre, Homi Bhabha National Institute (HBNI), Varanasi, India.
Breast sarcomas are a diverse group of malignant neoplasms originating from the mammary stroma. They are uncommon tumors, often occurring as a component of other tumors. Among malignant breast mesenchymal tumors, pure sarcomas lacking epithelial components are even rarer, comprising only 0.
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