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Rubin DC. The Stem Cell Niche in Short Bowel Syndrome. Gastroenterol Clin North Am 2024; 53:473-480. [PMID: 39068008 DOI: 10.1016/j.gtc.2024.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
In intestinal resection animal models of short bowel syndrome (SBS), the remaining epithelium mounts a robust adaptive response characterized by early stem cell expansion and increased crypt depth, villus height and nutrient absorption. In humans the adaptive response is critical for resumption of oral nutrition, yet it may be variable, and underlying mechanisms are much less well understood. Current knowledge relating to the role of stem and mesenchymal niche cells in the adaptive response in animal models and in human SBS are addressed in this review.
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Affiliation(s)
- Deborah C Rubin
- Division of Gastroenterology, Washington University School of Medicine, 660 South Euclid Avenue Box 8124, St Louis, MO 63110, USA.
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Malonga T, Vialaneix N, Beaumont M. BEST4 + cells in the intestinal epithelium. Am J Physiol Cell Physiol 2024; 326:C1345-C1352. [PMID: 38557358 DOI: 10.1152/ajpcell.00042.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 03/13/2024] [Accepted: 03/21/2024] [Indexed: 04/04/2024]
Abstract
The recent development of single-cell transcriptomics highlighted the existence of a new lineage of mature absorptive cells in the human intestinal epithelium. This subpopulation is characterized by the specific expression of Bestrophin 4 (BEST4) and of other marker genes including OTOP2, CA7, GUCA2A, GUCA2B, and SPIB. BEST4+ cells appear early in development and are present in all regions of the small and large intestine at a low abundance (<5% of all epithelial cells). Location-specific gene expression profiles in BEST4+ cells suggest their functional specialization in each gut region, as exemplified by the small intestine-specific expression of the ion channel CFTR. The putative roles of BEST4+ cells include sensing and regulation of luminal pH, tuning of guanylyl cyclase-C signaling, transport of electrolytes, hydration of mucus, and secretion of antimicrobial peptides. However, most of these hypotheses lack functional validation, notably because BEST4+ cells are absent in mice. The presence of BEST4+ cells in human intestinal organoids indicates that this in vitro model should be suitable to study their role. Recent studies showed that BEST4+ cells are also present in the intestinal epithelium of macaque, pig, and zebrafish and, here, we report their presence in rabbits, which suggests that these species could be appropriate animal models to study BEST4+ cells during the development of diseases and their interactions with environmental factors such as diet or the microbiota. In this review, we summarize the existing literature regarding BEST4+ cells and emphasize the description of their predicted roles in the intestinal epithelium in health and disease.NEW & NOTEWORTHY BEST4+ cells are a novel subtype of mature absorptive cells in the human intestinal epithelium highlighted by single-cell transcriptomics. The gene expression profile of BEST4+ cells suggests their role in pH regulation, electrolyte secretion, mucus hydration, and innate immune defense. The absence of BEST4+ cells in mice requires the use of alternative animal models or organoids to decipher the role of this novel type of intestinal epithelial cells.
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Affiliation(s)
- Tania Malonga
- GenPhySE, Université de Toulouse, INRAE, ENVT, 31326, Castanet Tolosan, France
- Université de Toulouse, INRAE, UR MIAT, Castanet-Tolosan, France
| | - Nathalie Vialaneix
- Université de Toulouse, INRAE, UR MIAT, Castanet-Tolosan, France
- Université de Toulouse, INRAE, BioinfOmics, GenoToul Bioinformatics Facility, Castanet-Tolosan, France
| | - Martin Beaumont
- GenPhySE, Université de Toulouse, INRAE, ENVT, 31326, Castanet Tolosan, France
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Kurup S, Tan C, Kume T. Cardiac and intestinal tissue conduct developmental and reparative processes in response to lymphangiocrine signaling. Front Cell Dev Biol 2023; 11:1329770. [PMID: 38178871 PMCID: PMC10764504 DOI: 10.3389/fcell.2023.1329770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Accepted: 12/08/2023] [Indexed: 01/06/2024] Open
Abstract
Lymphatic vessels conduct a diverse range of activities to sustain the integrity of surrounding tissue. Besides facilitating the movement of lymph and its associated factors, lymphatic vessels are capable of producing tissue-specific responses to changes within their microenvironment. Lymphatic endothelial cells (LECs) secrete paracrine signals that bind to neighboring cell-receptors, commencing an intracellular signaling cascade that preludes modifications to the organ tissue's structure and function. While the lymphangiocrine factors and the molecular and cellular mechanisms themselves are specific to the organ tissue, the crosstalk action between LECs and adjacent cells has been highlighted as a commonality in augmenting tissue regeneration within animal models of cardiac and intestinal disease. Lymphangiocrine secretions have been owed for subsequent improvements in organ function by optimizing the clearance of excess tissue fluid and immune cells and stimulating favorable tissue growth, whereas perturbations in lymphatic performance bring about the opposite. Newly published landmark studies have filled gaps in our understanding of cardiac and intestinal maintenance by revealing key players for lymphangiocrine processes. Here, we will expand upon those findings and review the nature of lymphangiocrine factors in the heart and intestine, emphasizing its involvement within an interconnected network that supports daily homeostasis and self-renewal following injury.
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Affiliation(s)
- Shreya Kurup
- Department of Medicine, Feinberg Cardiovascular and Renal Research Institute, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
- Honors College, University of Illinois at Chicago, Chicago, IL, United States
| | - Can Tan
- Department of Medicine, Feinberg Cardiovascular and Renal Research Institute, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Tsutomu Kume
- Department of Medicine, Feinberg Cardiovascular and Renal Research Institute, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
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Tong K, Bandari M, Carrick JN, Zenkevich A, Kothari OA, Shamshad E, Stefanik K, Haro KS, Perekatt AO, Verzi MP. In Vitro Organoid-Based Assays Reveal SMAD4 Tumor-Suppressive Mechanisms for Serrated Colorectal Cancer Invasion. Cancers (Basel) 2023; 15:5820. [PMID: 38136364 PMCID: PMC10742020 DOI: 10.3390/cancers15245820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 12/08/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023] Open
Abstract
Colon cancer is the third most prominent cancer and second leading cause of cancer-related deaths in the United States. Up to 20% of colon cancers follow the serrated tumor pathway driven by mutations in the MAPK pathway. Loss of SMAD4 function occurs in the majority of late-stage colon cancers and is associated with aggressive cancer progression. Therefore, it is important to develop technology to accurately model and better understand the genetic mechanisms behind cancer invasion. Organoids derived from tumors found in the Smad4KO BRAFV600E/+ mouse model present multiple phenotypes characteristic of invasion both in ex vivo and in vivo systems. Smad4KO BRAFV600E/+ tumor organoids can migrate through 3D culture and infiltrate through transwell membranes. This invasive behavior can be suppressed when SMAD4 is re-expressed in the tumor organoids. RNA-Seq analysis reveals that SMAD4 expression in organoids rapidly regulates transcripts associated with extracellular matrix and secreted proteins, suggesting that the mechanisms employed by SMAD4 to inhibit invasion are associated with regulation of extracellular matrix and secretory pathways. These findings indicate new models to study SMAD4 regulation of tumor invasion and an additional layer of complexity in the tumor-suppressive function of the SMAD4/Tgfβ pathway.
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Affiliation(s)
- Kevin Tong
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
- Human Genetics Institute of New Jersey, Piscataway, NJ 08854, USA
- Cancer Institute of New Jersey, New Brunswick, NJ 08901, USA
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, NJ 07110, USA
- Department of Medical Sciences, Hackensack Meridian Health School of Medicine, Nutley, NJ 07110, USA
| | - Manisha Bandari
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
| | - Jillian N. Carrick
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, NJ 07110, USA
| | - Anastasia Zenkevich
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, NJ 07110, USA
| | - Om A. Kothari
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
| | - Eman Shamshad
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
| | - Katarina Stefanik
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
- Department of Biology, The College of New Jersey, Ewing Township, NJ 08618, USA
| | - Katherine S. Haro
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
| | - Ansu O. Perekatt
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, NJ 07030, USA
| | - Michael P. Verzi
- Department of Genetics, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA (A.O.P.)
- Human Genetics Institute of New Jersey, Piscataway, NJ 08854, USA
- Cancer Institute of New Jersey, New Brunswick, NJ 08901, USA
- Rutgers Center for Lipid Research, New Brunswick, NJ 08901, USA
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