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Comparative analysis of cellular heterogeneity in the LAM lung using scRNA-seq

ABSTRACT: Comparative analysis of cellular heterogeneity in the LAM lung using scRNA-seq

PROVIDER: PRJNA580208 | ENA |

REPOSITORIES: ENA

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Comparative analysis of cellular heterogeneity in the LAM lung using scRNA-seq

Project description:Investigate detailed cellular composition of the LAM lung compared to the age and sex matched healthy control, in order to isolate LAM-lung-specific cellular states or subtypes.

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Comparative analysis of cellular heterogeneity in the LAM lung using bulk RNA-seq and scRNA-seq

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Transcript profiling of Lymphangioleiomyomatosis (LAM) nodules in Human Patients

Project description:Lymphangioleiomyomatosis (LAM) is characterized by cystic lung destruction caused by smooth, muscle-like LAM cells which have mutations in the tumor suppressor genes Tuberous Sclerosis Complex (TSC) 1 or 2, and the capacity to metastasize. Since chemokines and their receptors function in chemotaxis of metastatic cells, we hypothesized that LAM cells may be recruited by chemokine(s) in the lung. Quantification of 25 chemokines in bronchoalveolar lavage fluid from LAM patients and healthy volunteers revealed that concentrations of MCP-1/CCL2, GROa/CXCL1 and ENA-78/CXCL5 were significantly higher in samples from LAM patients than healthy volunteers. In this transcript analysis, expression of chemokine and chemokine receptor mRNA in LAM cells differed from those in melanoma and smooth muscle cells. Subsequent immunohistochemistry of lung sections from 30 LAM patients confirmed protein expression of chemokines and these receptors varied among LAM patient and differed from that seen in breast cancer and melanoma cells. . In vitro, MCP-1/CCL2 induced selective migration of cells showing loss of heterozygosity of TSC2 from a heterogeneous populations of cells grown from explanted LAM lungs. In addition, the frequencies of single-nucleotide polymorphisms in the MCP-1 gene promoter region differed significantly in LAM patients and healthy volunteers (p=0.018), and one polymorphism was associated significantly more frequently with the decline of lung function. These observations are consistent with the notion that chemokines such as MCP-1 may serve to specify site of LAM cell metastasis. Keywords: Human patient sample comparison with cell lines The study is of case/control design with biological replication. Biopsies of nodules from 14 LAM patients (cases) are compared with cultured cell lines (controls) with similar properties.

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