Masuko Katoh,  and Masaru Katoh
M&M Medical BioInformatics, Hongo 113-0033, Japan

We and others previously cloned and characterized vertebrate WNT11 orthologs, which are involved in gastrulation, neurulation, cardiogenesis, nephrogenesis, and chondrogenesis during fetal development. WNT11 orthologs activate both canonical and non-canonical WNT signaling cascades depending on the expression profile of WNT receptors, such as Frizzled family members, LRP6, ROR2, and RYK. Human WNT11 is expressed in breast cancer, gastric cancer, esophageal cancer, colorectal cancer, neuroblastoma, Ewing sarcoma, and prostate cancer. Canonical WNT signals and GATA family members are involved in WNT11 transcription during embryogenesis of model animals; however, precise mechanisms of WNT11 expression remain unclear. Here, refined integrative genomic analyses of WNT11 are carried out to elucidate the mechanisms of WNT11 transcription. The WNT11 gene was found to encode two isoforms by using alternative first exons. WNT11 isoform A (NM_004626.2 RefSeq) consists of exons 2, 3, 4, 5 and 6, whereas WNT11 isoform B consists of exons 1, 2, 3, 4, 5 and 6. We identified double TCF/LEF-binding sites within the proximal promoter regions -48-bp position from the TSS of human WNT11 isoform B and -43-bp position from the TSS of human WNT11 isoform A), and also double GATA-binding sites within intron 2 of human WNT11 gene (+933-bp and +5001-bp positions from TSS of human WNT11 isoform A). Double TCF/LEF- and double GATA-binding sites within the regulatory regions of human WNT11 gene were conserved in other mammalian WNT11 orthologs. These facts indicate that canonical WNT signals and GATA family members directly upregulate WNT11 transcription. Canonical WNT-induced WNT11 activates non-canonical WNT signaling cascades to induce cellular movement, and also activates the Ca2+-MAP3K7-NLK signaling cascade to break the canonical WNT signaling. Canonical WNT-to-WNT11 signaling loop is involved in cellular migration during embryogenesis as well as tumor invasion during carcinogenesis.

Stem Cell Reviews and Reports, vol. 3, no. 1, pp. 30-38, January, 2007,
10.1007/s12015-007-0006-6
http://www.springerlink.com/content/b6m48507818524vh/

http://www.springerlink.com/content/b6m48507818524vh/fulltext.pdf

"Networking of WNT, FGF, Notch, BMP, and Hedgehog Signaling Pathways during Carcinogenesis".

Masaru Katoh ¹

¹ Genetics and Cell Biology Section, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan

Contact Information  Masaru Katoh
Email: mkatoh-kkr@umin.ac.jp

The biological functions of some orthologs within the human genome and model-animal genomes are evolutionarily conserved, but those of others are divergent due to protein evolution and promoter evolution. Because WNT signaling molecules play key roles during embryogenesis, tissue regeneration and carcinogenesis, the author’s group has carried out a human WNT-ome project for the comprehensive characterization of human genes encoding WNT signaling molecules. From 1996 to 2002, we cloned and characterized WNT2B/WNT13, WNT3, WNT3A, WNT5B, WNT6, WNT7B, WNT8A, WNT8B, WNT9A/WNT14, WNT9B/WNT14B, WNT10A, WNT10B, WNT11, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD10, FRAT1, FRAT2, NKD1, NKD2, VANGL1, RHOU/ARHU, RHOV/ARHV, GIPC2, GIPC3, FBXW11/?TRCP2, SOX17, TCF7L1/TCF3, and established a cDNA-PCR system for snap-shot and dynamic analyses on the WNT-transcriptome. In 2003, we identified and characterized PRICKLE1, PRICKLE2, DACT1/DAPPER1, DACT2/DAPPER2, DAAM2, and BCL9L. After completion of the human WNT-ome project, we have been working on the stem cell signaling network. WNT signals are transduced to b-catenin, NLK, NFAT, PKC, JNK and RhoA signaling cascades. FGF20, JAG1 and DKK1 are target genes of the WNT-b-catenin signaling cascade. Cross-talk of WNT and FGF signaling pathways potentiates b-catenin and NFAT signaling cascades. BMP signals induce IHH upregulation in co-operation with RUNX. Hedgehog signals induce upregulation of SFRP1, JAG2 and FOXL1, and then FOXL1 induces BMP4 upregulation. The balance between WNT-FGF-Notch and BMP-Hedgehog signaling networks is important for the maintenance of homoestasis among stem and progenitor cells. Disruption of the stem cell signaling network results in pathological conditions, such as congenital diseases and cancer.

Keywords  WNT - FGF - Notch - BMP - Hedgehog - Stem cell biology - Comparative integromics - Systems medicine

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