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Long Noncoding RNA RP11-115N4.1Promotes Inflammatory Responses by Interacting with HNRNPH3 and Enhancing the Transcription of HSP70 in Unexplained Recurrent Spontaneous Abortion

ABSTRACT: RP11-115N4.1 was identified as the most differentially expressed lncRNA which was highly upregulated in peripheral blood of non-pregnant URSA patients (P = 3.63E-07, Fold change = 2.96),andthis dysregulation was further validated in approximately 26.7% additional patients (4/15). RP11-115N4.1 expression was detected in both lymphocytes and monocytes of human peripheral blood, andin vitro overexpression of RP11-115N4.1 decreased cell proliferation in K562 cellssignificantly. Furthermore, heat-shock HSP70 genes (HSPA1A and HSPA1B) were found to be significantly upregulated upon RP11-115N4.1 overexpression by transcriptome analysis (HSPA1A (P = 4.39E-08, Fold change = 4.17), HSPA1B (P = 2.26E-06, Fold change = 2.99)).RNApull down and RNA immunoprecipitation assay (RIP) analysis demonstrated that RP11-115N4.1 bound to HNRNPH3 protein directly, which in turn activateheat-shock proteins (HSP70) analyzed by protein-protein interaction and HNRNP` knockdown assays. Most importantly,the high expression of HSP70 was also verified in the serum of URSA patients and the supernatant of K562 cells with RP11-115N4.1 activation, andHSP70 in supernatant can exacerbate inflammatory responses in monocytes by inducing IL-6, IL-1β and TNF-α and inhibit the migration of trophoblast cells, which might associate with URSA.

ORGANISM(S): Homo sapiens

PROVIDER: GSE179996 | GEO | 2021/08/11

REPOSITORIES: GEO

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Project description:We previously showed that the proteasome inhibitor bortezomib (Velcade) induces cell death in a subset of human bladder cancer cell lines. Heat shock protein 72 kDa (Hsp72) is the major cytosolic stress-inducible molecular chaperone, and is thought to protect cells from proteasome inhibition. Here, using whole genome mRNA expression profiling, we identify isoform-specific expression of Hsp72 within a heterogeneous panel of bladder cancer cell lines. Bortezomib induced strong upregulation of both the HSPA1A and HSPA1B isoforms of Hsp72 in 253J B-V and SW780 (HSPA1A-high) cells, whereas only HSPA1B isoform expression was induced in UM-UC10 and UM-UC13 (HSPA1A-low) cells. Bortezomib stimulated the binding of heat shock factor-1 (HSF1) to the HSPA1A promoter much more efficiently in 253JB-V cells than in UM-UC13, but other HSF1 transcriptional targets were induced in all of the cell lines, implicating a specific defect in HSPA1A induction. Methylation-specific PCR revealed that the HSPA1A promoter was selectively methylated in the HSPA1A-low cell lines (UM-UC10 and UM-UC13), and exposure to the chromatin demethylating agent 5-aza-2'-deoxycytidine restored HSPA1A expression. Overexpression of Hsp72 promoted bortezomib resistance in the UM-UC10 and UM-UC13 cells, whereas transient knockdown of HSPA1B sensitized these cells to bortezomib. Exposure to the chemical HSF1 inhibitor KNK-437 promoted bortezomib sensitivity in the 253J B-V cells. Finally, shRNA-mediated stable knockdown of Hsp72 in 253J B-V promoted sensitivity to bortezomib both in vitro and in vivo. Together, our results suggest that a subset of human bladder cancer cells possess epigenetic modifications that shut off the HSPA1A promoter and increases dependency on the HSPA1B isoform to maintain Hsp72 expression. Our data also support the targeting of HSF1 or Hsp72 for use as tools to enhance bortezomib sensitivity in solid tumors. RNA was isolated from cells using the TRIzol Reagent (Invitrogen/ Life Technologies, Grand Island, NY), followed by cleanup with RNeasy Mini kits (Qiagen, Germantown, MD). RNA was used for the synthesis of biotin-labeled cRNA, which was prepared using the Illumina RNA amplification kit (Ambion/ Life Technologies), and then hybridized to Illumina Human-HT12 (Illumina, Inc., Hayward, CA) chips. Washed chips were scanned with BeadStation 500x (Illumina) and the signal intensities quantified with BeadStudio (Illumina).

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Long Noncoding RNA RP11-115N4.1Promotes Inflammatory Responses by Interacting with HNRNPH3 and Enhancing the Transcription of HSP70 in Unexplained Recurrent Spontaneous Abortion

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