Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P50583 (asymmetrical)
 12,197 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Vitamin A and its derivatives such as retinoic acid (RA) are important signaling molecules for morphogenesis of vertebrate embryos. Little is known, however, about morphogenetic factors controlling the development of the gastrointestinal tract and RA is likely to be involved. In the mouse, teratogenic doses of RA cause truncation of the embryonic caudal body axis that parallel the caudal regression syndrome as described in humans. These changes are often associated with anomalies of the lower digestive tract. Overlapping spatiotemporal expression of retinoic acid receptor-beta (RAR beta) and cellular retinol-binding protein I, CRBPI, with Hoxb5 and c-ret in the gut mesoderm imply possible cooperation required for proper neuromuscular development. To determine susceptibility and responsiveness of the developing gut and its neuromusculature to exogenous retinoids we used a mouse model of RA-induced caudal regression syndrome. The results showed that stage-specific RA treatment both in vivo and in vitro affected gut looping/rotation morphogenesis and growth of asymmetrical structures such as the cecum together with delayed differentiation of the gut mesoderm and colonization of the postcecal gut by neural crest-derived enteric neuronal precursors. These observations demonstrate that RA has a direct effect on gut morphogenesis and innervation.
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PMID:Embryonic gut anomalies in a mouse model of retinoic Acid-induced caudal regression syndrome: delayed gut looping, rudimentary cecum, and anorectal anomalies. 1173 81

The full-length sequence and zygotic expression of an amphioxus nodal gene are described. Expression is first detected in the early gastrula just within the dorsal lip of the blastopore in a region of hypoblast that is probably comparable with the vertebrate Spemann's organizer. In the late gastrula and early neurula, expression remains bilaterally symmetrical, limited to paraxial mesoderm and immediately overlying regions of the neural plate. Later in the neurula stage, all neural expression disappears, and mesodermal expression disappears from the right side. All along the left side of the neurula, mesodermal expression spreads into the left side of the gut endoderm. Soon thereafter, all expression is down-regulated except near the anterior and posterior ends of the animal, where transcripts are still found in the mesoderm and endoderm on the left side. At this time, expression also begins in the ectoderm on the left side of the head, in the region where the mouth later forms. These results suggest that amphioxus and vertebrate nodal genes play evolutionarily conserved roles in establishing Spemann's organizer, patterning the mesoderm rostrocaudally and setting up the asymmetrical left-right axis of the body.
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PMID:An amphioxus nodal gene (AmphiNodal) with early symmetrical expression in the organizer and mesoderm and later asymmetrical expression associated with left-right axis formation. 1249 42

Peripheral involvement of the joints, including pauciarticular, asymmetrical, transitory and migrating synovitis and enthesiopathy, is observed in 10-20% of affected inflammatory bowel disease patients. Recurrence is common and frequently coincides with a flare-up of intestinal disease. The true prevalence of axial involvement is less well established. Sacroiliitis is a hallmark of spondylitis, but is under-reported due to its insidious onset and sometimes asymptomatic nature. Radiographic evidence of sacroiliitis is present in about 20-25% of patients. Ankylosing spondylitis, as defined by the Rome criteria, is present in 3-10% of inflammatory bowel disease patients, and is thought to have a different genetic predisposition in these patients compared with 'classic' ankylosing spondylitis: whereas the human leucocyte antigen B27 phenotype is present in 90% of patients with 'classic' ankylosing spondylitis, the prevalence decreases to only 30% in patients with ankylosing spondylitis secondary to Crohn's disease. Polymorphisms involving CARD15 appear to be a possible genetic trigger: 78% of patients with Crohn's disease and symptomatic or asymptomatic sacroiliitis carry at least one mutation, compared with only 48% of control Crohn's disease patients. Moreover, in other forms of spondyloarthropathy, a similar association has been reported: 42% of patients with spondyloarthropathy and associated asymptomatic chronic gut inflammation, who are considered likely to develop Crohn's disease and ankylosing spondylitis, are carriers of at least one CARD15 mutation, compared with only 7% of patients with normal histology. In addition to genetic markers, clinical features support the relationship between gut and joint pathophysiology. In cases of spondyloarthropathy, a very rapid, substantial and sustained improvement in symptoms has been reported following treatment with infliximab, suggesting an essential role for tumour necrosis factor-alpha in spondyloarthropathy, similar to that observed in Crohn's disease.
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PMID:Review article: joint involvement in inflammatory bowel disease. 1535 92

Large cell nuclei with at least eight distinct morphologies have been discovered throughout the fetal gut (5-7 weeks), colonic adenomas, and adenocarcinomas, five of which are not present in the normal adult colon. The most remarkable nuclear forms are hollow bells, approximately 10-15 microns in height and about 7-10 microns in bell mouth diameter. When encased in tubular syncytia, these bell-shaped structures divide symmetrically by an amitotic nuclear fission process resembling the separation of two paper cups. Seven other nuclear morphotypes emerge from the bell-shaped nuclei within the syncytia by asymmetrical amitotic nuclear fission. Cells containing these differentiated nuclear forms subsequently divide extra-syncytially by mitoses that form clonal populations of cells with identical nuclear morphotypes in embryos, adenomas, adenocarcinomas, and metastases. Cells with bell-shaped nuclei thus appear to be responsible for both net growth and differentiation in the embryonic gut, adenomas, and adenocarcinomas, and fulfill the requirements for post-embryonic stem cells in colon organogenesis and carcinogenesis.
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PMID:Bell-shaped nuclei dividing by symmetrical and asymmetrical nuclear fission have qualities of stem cells in human colonic embryogenesis and carcinogenesis. 1636 58

Chronic inflammation ofmusculoskeletal structures is the most prominent disease manifestation of SpA. More specifically, the axial disease affects the spine, the sacroiliac joints and the hips. Peripheral disease includes peripheral arthritis, with a preference for asymmetrical inflammation ofjoints of the lower limbs and enthesitis, which is the presence of inflammation at the sites were ligaments and tendons attach to the bone. Additionally, SpA is often characterized by subclinical inflammation of the gut which partially resembles inflammatory bowel disease. Here, we will review the immunopathology of these different disease manifestations and relate them to clinical applications as well as emerging pathogenic concepts.
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PMID:Synovial and mucosal immunopathology in spondyloarthritis. 1973 21

Joint involvement associated with inflammatory bowel disease (IBD) belongs to the concept of spondyloarthritis (SpA) and includes two types of arthritis: a peripheral arthritis characterized by the presence of pauciarticular asymmetrical arthritis affecting preferentially joints of lower extremities and an axial arthropathy including inflammatory back pain, sacroiliitis and ankylosing spondylitis (AS). Treatment of arthritis includes a short-term use of NSAIDs associated with optimized treatment of gut inflammation. Safety concerns mean that long-term treatment with NSAIDs is best avoided if possible. Salazopyrine can be recommended for treatment of peripheral arthritis. Methotrexate and azathioprine are generally ineffective. Finally, efficacy of anti-TNF therapy (infliximab and adalimumab) is well established. However, use of etanercept is not recommended because of the increased risk for intestinal disease relapse. Pathogenesis of gut-joint iteropathy is not elucidated. Both inflammations are tightly related as suggested by human evidence of gut inflammation in patients with other forms of SpA and animal evidence of gut and joint inflammation in HLA-B27/human beta(2)-microglobulin transgenic rat model and TNF(DeltaARE) mice. Several clues for the linkage between gut and joint inflammation have been put forward including an altered recognition and handling of bacterial antigens, an aberrant trafficking of CD8+ T cells with an impaired T-helper type 1 cytokine profile and expression of aEb7 integrin, an altered trafficking of macrophages expressing CD163 and evidence of an increased angiogenesis. A transcriptome analysis of mucosal biopsies identified a set of 95 genes that are differentially expressed in both CD and SpA as compared with healthy controls suggesting common pathways. TNF plays a key role in the pathogenesis of various arthritic diseases and IBD. Mesenchymal/myofibroblast-like cells may represent the local primary targets of TNF in the induction of gut and joint pathology. Selective expression of TNFRI on these cells seems to be sufficient to orchestrate the complete development of SpA-related pathologies at least in TNF(DeltaARE) mice. Finally, genetic susceptibility is probably required to develop these pathologies. Genotyping of AS patients provided evidence for an important overlap between determinants of inherited predisposition to CD and AS. The best documented common association is with an IL-23R polymorphism, although the exact role remains unexplored. In addition, evidence suggests that a number of recently identified CD-susceptibility loci are associated with AS. Clinical, genetical, immunological and therapeutic evidence support the tight junction between gut and joint inflammation in two linked diseases, IBD and SpA, belonging to the 'immune-mediated inflammatory diseases'.
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PMID:Joint involvement associated with inflammatory bowel disease. 1989 67

(1) Congenital malformations of the mesentery are a definite morbid entity of a chronic type which may be recognized, before operation, by careful clinical investigation. (2) The symptom-complexes to which they give rise cannot be explained by reference to any of the well-known abdominal surgical diseases; still less by any purely functional disability which may be included under the term "indigestion." (3) The most important physical sign is the "emptiness" of the right iliac fossa, associated sometimes with an asymmetrical enlargement of the abdomen on the left side. These signs follow of necessity, inasmuch as the whole segment of the embryonic mid-gut is involved in a failure of rotation and fixation after reduction from the umbilical sac. (4) Radiological investigation should prove to be more helpful in confirming the clinical diagnosis when the special method of examination already described is used as a routine. (5) Operative treatment may cure the patient; alternatively it may reveal a pathological condition for which a rational course of treatment may be drawn up subsequently, when the precise details of the malformation have been discovered.
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PMID:President's Address: The Clinical Aspect of Congenital Mesenteric Malformation in Children. 1998 3

Vertebrate left-right (LR) body axis is manifested as an asymmetrical alignment of the internal organs such as the heart and the gut. It has been proposed that the process of LR determination commonly involves a cilia-driven leftward flow in the mammalian node and its equivalents (Kupffer's vesicle in zebrafish and the gastrocoel roof plate in Xenopus). Recently, it was reported that Ca(2+) flux regulates Kupffer's vesicle development and is required for LR determination. As a basis of Ca(2+) flux in many cell types, inositol 1,4,5-trisphosphate (IP(3)) receptor-mediated calcium release from the endoplasmic reticulum (ER) plays important roles. However, its involvement in LR determination is poorly understood. We investigated the role of IP(3) signaling in LR determination in Xenopus embryos. Microinjection of an IP(3) receptor-function blocking antibody that can inhibit IP(3) calcium channel activity randomized the LR axis in terms of left-sided Pitx2 expression and organ laterality. In addition, an IP(3) sponge that could inhibit IP(3) signaling by binding IP(3) more strongly than the IP(3) receptor impaired LR determination. Examination of the gastrocoel roof plate revealed that the number of cilia was significantly reduced by IP(3) signal blocking. These results provide evidence that IP(3) signaling is involved in LR asymmetry formation in vertebrates.
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PMID:IP3 signaling is required for cilia formation and left-right body axis determination in Xenopus embryos. 2168 63

The cytoskeletal protein Shroom3 is a potent inducer of epithelial cell shape change and is required for lens and neural plate morphogenesis. Analysis of gut morphogenesis in Shroom3 deficient mouse embryos revealed that the direction of gut rotation is also disrupted. It was recently established that Pitx2-dependent, asymmetrical cellular behaviors in the dorsal mesentery (DM) of the early mid-gut, a structure connecting the gut-tube to the rest of the embryo, contribute to the direction of gut rotation in chicken embryos by influencing the direction of the dorsal mesenteric tilt. Asymmetric cell shapes in the DM epithelium are hypothesized to contribute to the tilt, however, it is unclear what lies downstream of Pitx2 to alter epithelial cell shape. The cells of the left DM epithelium in either Pitx2 or Shroom3 deficient embryos are shorter and wider than those in control embryos and resemble the shape of those on the right, demonstrating that like Pitx2, Shroom3 is required for cell shape asymmetry and the leftward DM tilt. Because N-cadherin expression is specific to the left side and is Pitx2 dependent, we determined whether Shroom3 and N-cadherin function together to regulate cell shape in the left DM epithelium. Analysis of mouse embryos lacking one allele of both Shroom3 and N-cadherin revealed that they possess shorter and wider left epithelial DM cells when compared with Shroom3 or N-cadherin heterozygous embryos. This indicates a genetic interaction. Together these data provide evidence that Shroom3 and N-cadherin function cooperatively downstream of Pitx2 to directly regulate cell shape changes necessary for early gut tube morphogenesis.
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PMID:Shroom3 and a Pitx2-N-cadherin pathway function cooperatively to generate asymmetric cell shape changes during gut morphogenesis. 2172 47

A 24 years old lady presented with classical history of acute intestinal obstruction. There was a background history of chronic abdomen for 9 years. There was asymmetrical abdominal distension. On laparotomy, the entire small intestine was cocooned and enclosed in a yellowish white thick fibrotic membrane resulting in obstruction of the small intestine. When the membrane was carefully peeled off the small intestine, the underlying small gut was found to be absolutely healthy. The histopathology report was consistent with non-specific dense fibrosis. Based on these findings, a diagnosis of abdominal cocoon or sclerosing encapsulating peritonitis was made which is an extremely rare cause of small bowel obstruction.
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PMID:Abdominal cocoon (sclerosing encapsulating peritonitis): a rare cause of intestinal obstruction. 2241 59


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