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Non-small cell lung cancer (NSCLC) is the major form of lung cancer, with adenocarcinoma (LUAD) and squamous cell carcinoma (LUSC) being its major subtypes. Smoking alone cannot completely explain the lung cancer etiology. We hypothesize that altered lung microbiome and chronic inflammatory insults in lung tissues contribute to carcinogenesis. Here we explore the microbiome composition of LUAD samples, compared to LUSC and normal samples. Extraction of microbiome DNA in formalin-fixed, paraffin-embedded (FFPE) lung tumor and normal adjacent tissues was meticulously performed. The 16S rRNA product from extracted microbiota was subjected to microbiome amplicon sequencing. To assess the contribution of the host genome,  CD36  expression levels were analyzed then integrated with altered NSCLC subtype-specific microbe sequence data. Surprisingly phylum  Cyanobacteria  was consistently observed in LUAD samples. Across the NSCLC subtypes, differential abundance across four phyla ( Proteobacteria, Bacteroidetes, Actinobacteria , and  Firmicutes ) was identified based on the univariate analysis ( p -value < 6.4e-4 to 3.2e-2).  In silico  metagenomic and pathway analyses show that presence of microcystin correlates with reduced CD36 and increased PARP1 levels. This was confirmed in microcystin challenged NSCLC (A427) cell lines and  Cyanobacteria  positive LUAD tissues. Controlling the influx of  Cyanobacteria-like  particles or microcystin and the inhibition of PARP1 can provide a potential targeted therapy and prevention of inflammation-associated lung carcinogenesis.

PARP1 Is Up-Regulated in Non-small Cell Lung Cancer Tissues in the Presence of the Cyanobacterial Toxin Microcystin