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Hyperactive KRAS/MAPK signaling disrupts normal lymphatic vessel architecture and function

ABSTRACT: Hyperactive KRAS/MAPK signaling disrupts normal lymphatic vessel architecture and function

PROVIDER: PRJNA1000777 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25473582.fastq.gz	Fastqsanger.gz
	SRR25473583.fastq.gz	Fastqsanger.gz
	SRR25473584.fastq.gz	Fastqsanger.gz
	SRR25473585.fastq.gz	Fastqsanger.gz
	SRR25473586.fastq.gz	Fastqsanger.gz

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Hyperactive KRAS/MAPK signaling disrupts normal lymphatic vessel architecture and function

Project description:Complex lymphatic anomalies (CLAs) are sporadically occurring diseases caused by the maldevelopment of lymphatic vessels. We and others recently reported that somatic activating mutations in KRAS can cause CLAs. However, the mechanisms by which activating KRAS mutations cause CLAs are poorly understood. Here we show that KRASG12D expression in lymphatic endothelial cells (LECs) during embryonic development impairs the formation of lymphovenous valves and causes the enlargement of lymphatic vessels. We demonstrate that KRASG12D expression in primary human LECs induces cell spindling, proliferation, and migration. It also increases AKT and ERK1/2 phosphorylation and decreases the expression of genes that regulate lymphatic vessel maturation. We show that MEK1/2 inhibition with the FDA-approved drug trametinib suppresses KRASG12D-induced morphological changes, proliferation, and migration. Trametinib also decreases ERK1/2 phosphorylation and increases the expression of genes that regulate the maturation of lymphatic vessels. We also show that trametinib and Cre-mediated expression of a dominant-negative form of MEK1 (Map2k1K97M) suppresses KRASG12D-induced lymphatic vessel hyperplasia in embryos. Last, we demonstrate that conditional knockout of wild-type Kras in LECs does not affect the formation or function of lymphatic vessels. Together, our data indicate that KRAS/MAPK signaling must be tightly regulated during embryonic development for the proper development of lymphatic vessels and further support the testing of MEK1/2 inhibitors for treating CLAs.

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Project description:We did three sets of microarrays with three replicates each for a total of 9 arrays. Each array was run using pooled RNA from three animals. The three conditions were Normal tail skin (no intervention), Lymphedema tail skin(due to surgical lymphatic vessel blockage), and Surgical Sham control tail skin(surgical incision with no lymphatic vessel blockage). 15ug of test and reference (e17.5 mouse whole embryo) RNA was used for labeling.

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