PubMed · 15416885
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M W van WEEL. 1950-04-22. [Technic in thoracic surgery].. https://pubmed.ncbi.nlm.nih.gov/15416885/
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Respiratory infections with RNA viruses, such as rhinovirus or respiratory syncytial virus, are a major cause of asthma exacerbation, accompanied by enhanced neutrophilic and/or eosinophilic inflammation of the airways. We studied the effects of dsRNA synthesized during RNA virus replication, and of its receptor, TLR3, on the synthesis of eosinophilic chemokines in bronchial smooth muscle cells (BSMC). Synthetic dsRNA, polyinosinic-cystidic acid (poly(I:C)), induced the synthesis of eosinophilic chemokines, eotaxin-1/CCL11 and RANTES/CCL5, from primary cultures of human BSMC, and IL-4 increased synergistically the synthesis of poly(I:C)-induced CCL11. A robust eosinophil chemotactic activity was released from BSMC stimulated with poly(I:C) and IL-4, which was mostly inhibited by preincubation with an anti-CCL11, but not with an anti-CCL5 Ab. Although the immunoreactivity of TLR3 was detectable on the cellular surface of BSMC by flow cytometric analysis, pretreatment with an anti-TLR3-neutralizing Ab failed to block the poly(I:C)-induced synthesis of CCL11. We have determined by confocal laser-scanning microscopy that the immunoreactivity of TLR3 was aggregated intracellularly in poly(I:C)-stimulated BSMC, colocalizing with fluorescein-labeled poly(I:C). The synthesis of CCL11 was prominently inhibited by the transfection of TLR3-specific small interfering RNA or by bafilomycin A1, an endosomal acidification inhibitor, further supporting the essential role played by intracellular TLR3 in the synthesis of poly(I:C)-induced CCL11 in BSMC. In conclusion, these observations suggest that, by activating intracellular TLR3 in BSMC, respiratory RNA virus infections stimulate the production of CCL11 and enhance eosinophilic inflammation of the airways in the Th2-dominant microenvironment.
Sclerosing hemangioma (SH) with endobronchial growth (SH-EG) is an extremely unusual form of SH. A case of SH-EG in a 47-year-old female is described. She suffered from a productive cough for 4 months. A chest CT scan revealed a well-circumscribed, parenchymal mass with endobronchial lesions continuously extending to the right main bronchus. Right upper sleeve lobectomy was carried out. The tumor was 4.8 x 3.5 cm in size, tan-brown, and elastically soft. It was located in the pulmonary parenchyma of the right upper lobe and continuously extended to the right upper bronchus. Furthermore, the main tumor also spread into segmental bronchi and peripheral bronchioles. Microscopically, the tumor consisted of round to cuboidal cells with papillary and solid patterns, partly showing sclerosis and hemorrhage. For 2.5 years after surgery, the patient has been well without recurrence or metastasis. Florid intrabronchial extension as seen in this case has never been documented in SH. To form an endobronchial component, it seems to be crucial that the parenchymal SH is located adjacent to the bronchus and involves it, followed by the destruction of the bronchial cartilage.
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