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Investigation on molecular mechanism underlying the dynamic evolution from preneoplasia to invasive lung adenocarcinoma

ABSTRACT: The cell ecology and spatial niche implicated in the dynamic and sequential process of lung adenocarcinoma (LUAD) from adenocarcinoma in situ (AIS) to minimally invasive adenocarcinoma (MIA) and subsequent invasive adenocarcinoma (IAC) have not yet been elucidated. Here, we performed an integrative analysis of single-cell RNA sequencing (scRNA-seq) and spatial transcriptomics (ST) to characterize the cell atlas of the invasion trajectory of LUAD. We found that the UBE2C + cancer cell subpopulation constantly increased during the invasive process of LUAD with remarkable elevation in IAC, and its spatial distribution was in the peripheral cancer region of the IAC, representing a more malignant phenotype. Furthermore, analysis of the TME cell type subpopulation showed a constant decrease in mast cells, monocytes, and lymphatic endothelial cells, which were implicated in the whole process of invasive LUAD, accompanied by an increase in NK cells and MALT B cells from AIS to MIA and an increase in Tregs and secretory B cells from MIA to IAC. Notably, for AIS, cancer cells, NK cells, and mast cells were colocalized in the cancer region; however, for IAC, Tregs colocalized with cancer cells. Finally, communication and interaction between cancer cells and TME cell-induced constitutive activation of TGF-β signaling were involved in the invasion of IAC. Therefore, our results reveal the specific cellular information and spatial architecture of cancer cells and TME subpopulations, as well as the cellular interaction between them, which will facilitate the identification and development of precision medicine in the invasive process of LUAD from AIS to IAC.

ORGANISM(S): Homo sapiens

PROVIDER: GSE282617 | GEO | 2024/11/26

REPOSITORIES: GEO

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Project description:Adenocarcinoma in situ (AIS) is considered an intermediate step in the progression of normal lung tissue to invasive adenocarcinoma. However, the molecular mechanisms underlying this progression remain to be fully elucidated due to difficulties in obtaining and preserving clinical samples for downstream analyses. Formalin fixation and paraffin embedding (FFPE) is a tissue preservation system that is widely used as a means for long-term storage. Until now, challenges in working with FFPE have precluded using new RNA sequencing technologies (RNA-seq), which would help clarify some of the key pathways affected in the transition from normal to AIS to invasive adenocarcinoma. Recent technological advances have made it possible to sequence RNA from archival tissues. Also, isolation techniques including laser-capture micro-dissection provide the ability to select histopathologically distinct tissues, allowing researchers to study transcriptional variations between tightly juxtaposed cell and tissue types. Utilizing these technologies and new alignment tools we examined differential expression of long intergenic non-coding RNAs and mRNAs across normal, AIS and invasive adenocarcinoma samples from six patients to identify possible markers of lung cancer progression. RNA extracted and sequenced from these 18 samples generated an average of 198 million reads per sample. After alignment and filtering, uniquely aligned reads represented an average 35% of the total reads. We detected differential expression of a number of lincRNAs and mRNAs when comparing normal to AIS, or AIS to invasive adenocarcinoma. Of these, 5 lincRNAs and 31 mRNAs were consistently up- or down-regulated from normal to AIS and more so to invasive carcinoma. We validated the up-regulation of two mRNAs and one lincRNA by RT-qPCR as proof of principle. Our findings indicate a potential role of not only mRNAs, but also lincRNAs in invasive adenocarcinoma. We anticipate that our current findings will lay the groundwork for future experimental studies of candidate RNAs from FFPE samples to identify their functional roles in lung cancer.

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Investigation on molecular mechanism underlying the dynamic evolution from preneoplasia to invasive lung adenocarcinoma

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