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Gastric Mesenchymal Myofibroblasts Maintain Stem Cell Activity and Proliferation of Murine Gastric Epithelium in Vitro.

Am J Pathol. 2014 Dec 26. pii: S0002-9440(14)00675-0.

Katano T, Ootani A, Mizoshita T, Tanida S, Tsukamoto H, Ozeki K, Kataoka H, Joh T.
PMID: 25546442 | DOI: 10.1016/j.ajpath.2014.11.007.

Stem cells are influenced by a microenvironmental niche that includes mesenchymal cells. We established a novel long-term method for primary mouse glandular stomach culture with mesenchymal myofibroblasts to investigate gastric epithelial-mesenchymal interactions. A gastric mesenchymal myofibroblast (GMF) cell line was established from mouse glandular stomach. Glandular stomach cells from neonatal mice and GMF cells were co-cultured in a collagen gel. Cultured stomach cells yielded expanding sphere-like structures. In the GMF co-culture system, the number and size of gastrospheres were increased compared with control cultures (P = 0.009 and 0.008, respectively). Immunohistochemistry showed cells positive for human gastric mucin, HIK1083, and chromogranin A, indicating differentiation into surface mucous cells, mucous neck cells, and enteroendocrine cells, respectively. RNA in situ hybridization for Lgr5 showed Lgr5+ stem cells in the cultured gastrospheres. Lgr5+ cells were observed persistently in the epithelium of gastrospheres in the GMF co-culture system for 2 months. GMFs allowed the cultured gastric epithelium to maintain active proliferation similar to that seen in vivo. Real-time quantitative RT-PCR showed that Gas1 expression was higher in GMFs (P = 0.0445), and Hoxc8, Notch1, and Sox10 expressions were higher in intestinal mesenchymal myofibroblasts (P = 0.0003, 0.0143, and 0.0488, respectively). We show the potential role of GMFs in sustaining Lgr5+ stem cell activity and affecting normal gastric epithelial differentiation and proliferation.
Modeling colorectal cancer using CRISPR-Cas9-mediated engineering of human intestinal organoids.

Nat Med. 2015 Feb 23.

Matano M, Date S, Shimokawa M, Takano A, Fujii M, Ohta Y, Watanabe T, Kanai T, Sato T.
PMID: 25706875 | DOI: 10.1038/nm.3802.

Human colorectal tumors bear recurrent mutations in genes encoding proteins operative in the WNT, MAPK, TGF-β, TP53 and PI3K pathways. Although these pathways influence intestinal stem cell niche signaling, the extent to which mutations in these pathways contribute to human colorectal carcinogenesis remains unclear. Here we use the CRISPR-Cas9 genome-editing system to introduce multiple such mutations into organoids derived from normal human intestinal epithelium. By modulating the culture conditions to mimic that of the intestinal niche, we selected isogenic organoids harboring mutations in the tumor suppressor genes APC, SMAD4 and TP53, and in the oncogenes KRAS and/or PIK3CA. Organoids engineered to express all five mutations grew independently of niche factors in vitro, and they formed tumors after implantation under the kidney subcapsule in mice. Although they formed micrometastases containing dormant tumor-initiating cells after injection into the spleen of mice, they failed to colonize in the liver. In contrast, engineered organoids derived from chromosome-instable human adenomas formed macrometastatic colonies. These results suggest that 'driver' pathway mutations enable stem cell maintenance in the hostile tumor microenvironment, but that additional molecular lesions are required for invasive behavior.
Modeling colorectal cancer using CRISPR-Cas9-mediated engineering of human intestinal organoids.

Nat Med.

2015 Mar 01

Matano M, Date S, Shimokawa M, Takano A, Fujii M, Ohta Y, Watanabe T, Kanai T, Sato T.
PMID: 25706875 | DOI: 10.1038/nm.3802

Human colorectal tumors bear recurrent mutations in genes encoding proteins operative in the WNT, MAPK, TGF-β, TP53 and PI3K pathways. Although these pathways influence intestinal stem cell niche signaling, the extent to which mutations in these pathways contribute to human colorectal carcinogenesis remains unclear. Here we use the CRISPR-Cas9 genome-editing system to introduce multiple such mutations into organoids derived from normal human intestinal epithelium. By modulating the culture conditions to mimic that of the intestinal niche, we selected isogenic organoids harboring mutations in the tumor suppressor genes APC, SMAD4 and TP53, and in the oncogenes KRAS and/or PIK3CA. Organoids engineered to express all five mutations grew independently of niche factors in vitro, and they formed tumors after implantation under the kidney subcapsule in mice. Although they formed micrometastases containing dormant tumor-initiating cells after injection into the spleen of mice, they failed to colonize in the liver. In contrast, engineered organoids derived from chromosome-instable human adenomas formed macrometastatic colonies. These results suggest that 'driver' pathway mutations enable stem cell maintenance in the hostile tumor microenvironment, but that additional molecular lesions are required for invasive behavior.

Leucine‐rich repeat‐containing G‐protein‐coupled receptor 5 expression and clinicopathological features of colorectal neuroendocrine neoplasms

Pathol Int.

2018 Jul 24

Nakajima T, Uehara T, Kobayashi Y, Kinugawa Y, Yamanoi K, Maruyama Y, Suga T, Ota H.
PMID: 30043418 | DOI: 10.1111/pin.12707

LGR5 is expressed in various tumors and has been identified as a putative intestinal stem cell marker. Here we investigated LGR5 expression in colorectal neuroendocrine neoplasms and analyzed the correlation with pathological characteristics. We evaluated the clinicopathological features of 8 neuroendocrine tumor (NET) grade 1 (NET G1), 4 NET Grade 2 (NET G2), and 8 NET Grade 3 (NET G3; also termed neuroendocrine carcinoma, or NEC) cases. We examined LGR5 expression using an RNAscope, a newly developed RNA in situ hybridization technique, with a tissue microarray of the neuroendocrine neoplasm samples. LGR5 staining in individual tumor cells was semi-quantitatively scored using an H-score scale. We also performed a combination of LGR5 RNA in situ hybridization and synaptophysin immunohistochemistry. All cases contained tumor cells with some LGR5-positive dots. For all cases, H-scores showed a positive correlation with nuclear beta-catenin expression. In the NEC group, there was a strong positive correlation between H-score and beta-catenin expression. Our findings suggest that LGR5 may serve as a stem cell marker in NEC, as is the case in colon adenocarcinoma. The positive correlation between H-score and beta-catenin expression suggests that LGR5 expression might be affected by beta-catenin expression in neuroendocrine neoplasms and especially in NEC.

Partial male-to-female reprogramming of mouse fetal testis by sertoli cell ablation

Development (Cambridge, England)

2023 Jun 28

Imaimatsu, K;Hiramatsu, R;Tomita, A;Itabashi, H;Kanai, Y;
PMID: 37376880 | DOI: 10.1242/dev.201660

Temporal transcription profiles of fetal testes with Sertoli cell ablation were examined in 4-day culture using a diphtheria toxin (DT)-dependent cell knockout system in AMH-TRECK transgenic (Tg) mice. RNA analysis revealed that ovarian-specific genes, including Foxl2, were ectopically expressed in DT-treated Tg testis explants initiated at embryonic days 12.5-13.5. FOXL2-positive cells were ectopically observed in two testicular regions-near the testicular surface epithelia and around its adjacent mesonephros. The surface FOXL2-positive cells, together with ectopic expression of Lgr5 and Gng13 (markers of ovarian cords), were derived from the testis epithelia/subepithelia, whereas another FOXL2-positive population was the 3βHSD-negative stroma near the mesonephros. In addition to high expression of Fgfr1/Fgfr2 and heparan sulfate proteoglycan (a reservoir for FGF ligand) in these two sites, exogenous FGF9 additives repressed DT-dependent Foxl2 upregulation in Tg testes. These findings imply retention of Foxl2 inducibility in the surface epithelia and peri-mesonephric stroma of the testicular parenchyma, in which certain paracrine signals, including FGF9 derived from fetal Sertoli cells, repress feminization in these two sites of the early fetal testis.
LAT1 expression influences Paneth cell number and tumor development in ApcMin/+ mice

Journal of gastroenterology

2023 Feb 05

Sui, Y;Hoshi, N;Ohgaki, R;Kong, L;Yoshida, R;Okamoto, N;Kinoshita, M;Miyazaki, H;Ku, Y;Tokunaga, E;Ito, Y;Watanabe, D;Ooi, M;Shinohara, M;Sasaki, K;Zen, Y;Kotani, T;Matozaki, T;Tian, Z;Kanai, Y;Kodama, Y;
PMID: 36739585 | DOI: 10.1007/s00535-023-01960-5

Amino acid transporters play an important role in supplying nutrition to cells and are associated with cell proliferation. L-type amino acid transporter 1 (LAT1) is highly expressed in many types of cancers and promotes tumor growth; however, how LAT1 affects tumor development is not fully understood.To investigate the role of LAT1 in intestinal tumorigenesis, mice carrying LAT1 floxed alleles that also expressed Cre recombinase from the promoter of gene encoding Villin were crossed to an ApcMin/+ background (LAT1fl/fl; vil-cre; ApcMin/+), which were subject to analysis; organoids derived from those mice were also analyzed.This study showed that LAT1 was constitutively expressed in normal crypt base cells, and its conditional deletion in the intestinal epithelium resulted in fewer Paneth cells. LAT1 deletion reduced tumor size and number in the small intestine of ApcMin/+ mice. Organoids derived from LAT1-deleted ApcMin/+ intestinal crypts displayed fewer spherical organoids with reduced Wnt/β-catenin target gene expression, suggesting a low tumor-initiation capacity. Wnt3 expression was decreased in the absence of LAT1 in the intestinal epithelium, suggesting that loss of Paneth cells due to LAT1 deficiency reduced the risk of tumor initiation by decreasing Wnt3 production.LAT1 affects intestinal tumor development in a cell-extrinsic manner through reduced Wnt3 expression in Paneth cells. Our findings may partly explain how nutrient availability can affect the risk of tumor development in the intestines.
RSPO3 expands intestinal stem cell and niche compartments and drives tumorigenesis.

Gut.

2016 Aug 10

Hilkens J, Timmer NC, Boer M, Ikink GJ, Schewe M, Sacchetti A, Koppens MA, Song JY, Bakker ER.
PMID: 27511199 | DOI: 10.1136/gutjnl-2016-311606

Abstract

OBJECTIVE:

The gross majority of colorectal cancer cases results from aberrant Wnt/β-catenin signalling through adenomatous polyposis coli (APC) or CTNNB1 mutations. However, a subset of human colon tumours harbour, mutually exclusive with APC and CTNNB1 mutations, gene fusions in RSPO2 or RSPO3, leading to enhanced expression of these R-spondin genes. This suggested that RSPO activation can substitute for the most common mutations as an alternative driver for intestinal cancer. Involvement of RSPO3 in tumour growth was recently shown in RSPO3-fusion-positive xenograft models. The current study determines the extent into which solely a gain in RSPO3 actually functions as a driver of intestinal cancer in a direct, causal fashion, and addresses the in vivo activities of RSPO3 in parallel.

DESIGN:

We generated a conditional Rspo3 transgenic mouse model in which the Rspo3 transgene is expressed upon Cre activity. Cre is provided by cross-breeding with Lgr5-GFP-CreERT2 mice.

RESULTS:

Upon in vivo Rspo3 expression, mice rapidly developed extensive hyperplastic, adenomatous and adenocarcinomatous lesions throughout the intestine. RSPO3 induced the expansion of Lgr5+ stem cells, Paneth cells, non-Paneth cell label-retaining cells and Lgr4+ cells, thus promoting both intestinal stem cell and niche compartments. Wnt/β-catenin signalling was modestly increased upon Rspo3 expression and mutant Kras synergised with Rspo3 in hyperplastic growth.

CONCLUSIONS:

We provide in vivo evidence that RSPO3 stimulates the crypt stem cell and niche compartments and drives rapid intestinal tumorigenesis. This establishes RSPO3 as a potent driver of intestinal cancer and proposes RSPO3 as a candidate target for therapy in patients with colorectal cancer harbouring RSPO3 fusions.

Y-Chromosome Gene, Uty, Protects Against Pulmonary Hypertension by Reducing Proinflammatory Chemokines

American journal of respiratory and critical care medicine

2022 May 03

Cunningham, CM;Li, M;Ruffenach, G;Doshi, M;Aryan, L;Hong, J;Park, J;Hrncir, H;Medzikovic, L;Umar, S;Arnold, AP;Eghbali, M;
PMID: 35504005 | DOI: 10.1164/rccm.202110-2309OC

Idiopathic pulmonary arterial hypertension (PAH) is a terminal pulmonary vascular disease characterized by increased pressure, right ventricular failure and death. PAH exhibits a striking sex bias and is up to 4x more prevalent in females. Understanding the molecular basis behind sex differences could help uncover novel therapies.We previously discovered the Y-Chromosome is protective against hypoxia-induced experimental PH which may contribute to sex differences in PAH. Here, we identify the gene responsible for Y-Chromosome protection, investigate key downstream autosomal genes, and demonstrate a novel preclinical therapy. Methods, Measurements and Main Results: To test the effect of Y-Chromosome genes on PH development, we knocked down each Y-Chromosome gene expressed in the lung via intratracheal instillation of siRNA in gonadectomized male mice exposed to hypoxia. Knockdown of Y-Chromosome gene Uty resulted in more severe PH measured by increased right ventricular pressure and decreased pulmonary artery acceleration time. RNA-sequencing revealed an increase in proinflammatory chemokines Cxcl9 and Cxcl10 as a result of Uty knockdown. We found CXCL9 and CXCL10 significantly upregulated in human PAH lungs, with more robust upregulation in PAH females. Treatment of human pulmonary artery endothelial cells with CXCL9 and CXCL10 triggered apoptosis. Inhibition of CXCL9 and CXCL10 expression in male Uty knockout mice and CXCL9 and CXCL10 activity in female rats significantly reduced PH severity.Uty, is protective against PH. Reduction of Uty expression results in increased expression of proinflammatory chemokines CXCL9 and CXCL10 which trigger endothelial cell death and PH. Inhibition of Cxcl9 and Cxcl10 rescues PH development in multiple experimental models.
Transcriptome-wide Analysis Reveals Hallmarks of Human Intestine Development and Maturation In Vitro and In Vivo.

Stem Cell Reports. 2015 Jun 3.

Finkbeiner SR, Hill DR, Altheim CH, Dedhia PH, Taylor MJ, Tsai YH, Chin AM, Mahe MM, Watson CL, Freeman JJ, Nattiv R, Thomson M, Klein OD, Shroyer NF, Helmrath MA, Teitelbaum DH, Dempsey PJ, Spence JR.
PMID: 26067134

Human intestinal organoids (HIOs) are a tissue culture model in which small intestine-like tissue is generated from pluripotent stem cells. By carrying out unsupervised hierarchical clustering of RNA-sequencing data, we demonstrate that HIOs most closely resemble human fetal intestine. We observed that genes involved in digestive tract development are enriched in both fetal intestine and HIOs compared to adult tissue, whereas genes related to digestive function and Paneth cell host defense are expressed at higher levels in adult intestine. Our study also revealed that the intestinal stem cell marker OLFM4 is expressed at very low levels in fetal intestine and in HIOs, but is robust in adult crypts. We validated our findings using in vivo transplantation to show that HIOs become more adult-like after transplantation. Our study emphasizes important maturation events that occur in the intestine during human development and demonstrates that HIOs can be used to model fetal-to-adult maturation.
Distribution of intestinal stem cell markers in colorectal precancerous lesions

Histopathology (2015).

Jang BG, Kim HS, Kim KJ, Rhee YY, Kim WH, Kang GH.
PMID: 10.1111/his.12787

Abstract Aims Intestinal stem cell (ISC) markers such as LGR5, ASCL2, EPHB2 and OLFM4 and their clinical implications have been extensively studied in colorectal cancers (CRCs). However, little is known about their expression in precancerous lesions of CRCs. Here, we investigated the expression and distribution of ISC markers in serrated polyps and conventional adenomas. Methods and results RT-PCR analysis revealed that all ISC markers were significantly upregulated in conventional adenomas with low grade dysplasia (CALGs) compared with other lesions. RNA in situ hybridization confirmed that CALGs exhibited strong and diffuse expression of all ISC markers, which indicate a stem cell-like phenotype. However, normal colonic mucosa hyperplastic polyps and sessile serrated adenomas harbored LGR5+ cells that were confined to the crypt base and demonstrated an organized expression of ISC markers. Notably, in traditional serrated adenomas, expression of LGR5 and ASCL2 was localized to the ectopic crypts as in the normal crypts, but expression of EPHB2 and OLFM4 was distributed in a diffuse manner, which is suggestive of a progenitor-like features. Conclusions The expression and distribution profile of ISC markers possibly provides insights into the organization of stem and progenitor-like cells in each type of precancerous lesion of CRC
Intestinal Apc-inactivation induces HSP25 dependency

EMBO molecular medicine

2022 Nov 02

van Neerven, SM;Smit, WL;van Driel, MS;Kakkar, V;de Groot, NE;Nijman, LE;Elbers, CC;Léveillé, N;Heijmans, J;Vermeulen, L;
PMID: 36321561 | DOI: 10.15252/emmm.202216194

The majority of colorectal cancers (CRCs) present with early mutations in tumor suppressor gene APC. APC mutations result in oncogenic activation of the Wnt pathway, which is associated with hyperproliferation, cytoskeletal remodeling, and a global increase in mRNA translation. To compensate for the increased biosynthetic demand, cancer cells critically depend on protein chaperones to maintain proteostasis, although their function in CRC remains largely unexplored. In order to investigate the role of molecular chaperones in driving CRC initiation, we captured the transcriptomic profiles of murine wild type and Apc-mutant organoids during active transformation. We discovered a strong transcriptional upregulation of Hspb1, which encodes small heat shock protein 25 (HSP25). We reveal an indispensable role for HSP25 in facilitating Apc-driven transformation, using both in vitro organoid cultures and mouse models, and demonstrate that chemical inhibition of HSP25 using brivudine reduces the development of premalignant adenomas. These findings uncover a hitherto unknown vulnerability in intestinal transformation that could be exploited for the development of chemopreventive strategies in high-risk individuals.
Cutaneous barrier leakage and gut inflammation drive skin disease in Omenn Syndrome

J Allergy Clin Immunol.

2020 Apr 17

Rigoni R, Fontana E, Dobbs K, Marrella V, Taverniti V, Maina V, Facoetti A, D'Amico G, Al-Herz W, Cruz-Munoz ME, Schuetz C, Gennery AR, Garabedian EK, Giliani S, Draper D, Dbaibo G, Geha RS, Meyts I1, Tousseyn T, Neven B, Moshous D, Fischer A, Schulz A, Finocchi A, Kuhns DB, Fink DL, Lionakis MS, Swamydas M, Guglielmetti S, Alejo J, Myles IA, Pittaluga S, Notarangelo LD, Villa A, Cassani B
PMID: 32311393 | DOI: 10.1016/j.jaci.2020.04.005

BACKGROUND: Severe early-onset erythroderma and gut inflammation, with massive tissue infiltration of oligoclonal activated T cells are the hallmark of Omenn Syndrome (OS). OBJECTIVE: The impact of altered gut homeostasis in the cutaneous manifestations of OS remains to be clarified. METHODS: We analyzed a cohort of 15 patients with OS and the Rag2R229Q mouse model. Homing phenotype of circulating lymphocytes were analyzed by flow cytometry. Inflammatory cytokines and chemokines were examined in the sera by ELISA and in skin biopsies by immunohistochemistry and in situ RNA hybridization. Experimental colitis was induced in mice by dextran sulfate sodium salt (DSS). RESULTS: We show that memory/activated T cells from OS patients and from the Rag2R229Q mouse model of OS abundantly express the skin homing receptors Cutaneous Lymphocyte Associated Antigen (CLA) and CCR4, associated with high levels of CCL17 and CCL22 chemokines. Serum levels of LPS are also elevated. A broad Th1/Th2/Th17 inflammatory signature is detected in the periphery and in the skin. Increased Tlr4 expression in the skin of Rag2R229Q mice is associated with enhanced cutaneous inflammation upon local and systemic administration of LPS. Likewise, boosting colitis in Rag2R229Q mice results in increased frequency of CCR4+ splenic T cells and worsening of skin inflammation, as indicated by epidermal thickening, enhanced epithelial cell activation and dermal infiltration by Th1 effector T cells. CONCLUSIONS: These results support the existence of an interplay between gut and skin that can sustain skin inflammation in O

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Description
sense
Example: Hs-LAG3-sense
Standard probes for RNA detection are in antisense. Sense probe is reverse complent to the corresponding antisense probe.
Intron#
Example: Mm-Htt-intron2
Probe targets the indicated intron in the target gene, commonly used for pre-mRNA detection
Pool/Pan
Example: Hs-CD3-pool (Hs-CD3D, Hs-CD3E, Hs-CD3G)
A mixture of multiple probe sets targeting multiple genes or transcripts
No-XSp
Example: Hs-PDGFB-No-XMm
Does not cross detect with the species (Sp)
XSp
Example: Rn-Pde9a-XMm
designed to cross detect with the species (Sp)
O#
Example: Mm-Islr-O1
Alternative design targeting different regions of the same transcript or isoforms
CDS
Example: Hs-SLC31A-CDS
Probe targets the protein-coding sequence only
EnEmProbe targets exons n and m
En-EmProbe targets region from exon n to exon m
Retired Nomenclature
tvn
Example: Hs-LEPR-tv1
Designed to target transcript variant n
ORF
Example: Hs-ACVRL1-ORF
Probe targets open reading frame
UTR
Example: Hs-HTT-UTR-C3
Probe targets the untranslated region (non-protein-coding region) only
5UTR
Example: Hs-GNRHR-5UTR
Probe targets the 5' untranslated region only
3UTR
Example: Rn-Npy1r-3UTR
Probe targets the 3' untranslated region only
Pan
Example: Pool
A mixture of multiple probe sets targeting multiple genes or transcripts

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