Oral manifestations of inflammatory bowel disease

Inflammatory bowel diseases (IBD), including Crohn\u2019s disease and ulcerative colitis, have important extraintestinal manifestations, notably in the oral cavity. These oral manifestations can constitute important clinical clues in the diagnosis and management of IBD, and include changes at the immune and bacterial levels. Aphthous ulcers, pyostomatitis vegetans, cobblestoning and gingivitis are important oral findings frequently observed in IBD patients. Their presentations vary considerably and might be well diagnosed and distinguished from other oral lesions. Infections, drug side effects, deficiencies in some nutrients and many other diseases involved with oral manifestations should also be taken into account. This article discusses the most recent findings on the oral manifestations of IBD with a focus on bacterial modulations and immune changes. It also includes an overview on options for management of the oral lesions of IBD

Skuteczność połączenia ezetymibu/simwastatyny w dawkach 10/40 mg w porównaniu z podwójną dawką statyny u pacjentów hospitalizowanych z powodu ostrego incydentu wieńcowego: badanie INFORCE

Wstęp: Celem pracy było zbadanie skuteczności i bezpiecze&#241;stwa stosowania skojarzonego preparatu ezetymibu/simwastatyny (Eze/Simva) w dawce 10/40 mg w porównaniu z podwójną dawką statyny, które włączano przy wypisie ze szpitala u pacjentów przyjmujących dotychczas statyny, a u których powodem hospitalizacji była diagnostyka epizodu wieńcowego. Metody: Było to otwarte wieloośrodkowe badanie IV fazy, z randomizacją, prowadzone w układzie równoległym z grupą kontrolną, do którego zakwalifikowano 424 pacjentów (w wieku &#8805; 18 lat) hospitalizowanych z powodu ostrego epizodu wieńcowego. Pacjenci przyjmowali wcześniej statyny (przez &#8805; 6 tygodni) w stałej dawce, której wartość można było podwoić zgodnie z zaleceniami producenta preparatu. W momencie wypisu ze szpitala pacjent ów dzielono na grupy pod wzgl&#234;dem dawki/siły działania statyny (duża, średnia, mała) i przydzielano losowo w stosunku 1:1 do grupy, która przyjmowała następnie podwojoną dawkę tego preparatu (n = 211) lub preparat Eze/Simva w dawce 10/40 mg (n = 213) przez 12 tygodni. Pierwszorzędową zmienną określającą skuteczność zastosowanego leczenia było stężenie frakcji cholesterolu o małej gęstości (LDL-C) wyrażone w wartościach bezwzględnych [mmol/l] w momencie zakończenia badania. Wyniki: Średnie wartości stężenia cholesterolu frakcji LDL w punkcie wyjściowym wynosiły 2,48 mmol/l w grupie Eze/Simva i 2,31 mmol/l w grupie leczonej tylko statyną. W momencie zako&#241;czenia badania wartości najmniejszych kwadratów stężenie LDL-C wyniosły odpowiednio 1,74 mmol/l w grupie Eze/Simva i 2,22 mmol/l w grupie leczonej statyną; różnica pomiędzy grupami osiągnęła wartość znamienną statystycznie, rzędu -0,49 mmol/l (p &#8804; 0,001). Przyjmowanie skojarzonego preparatu Eze/Simva powodowało także znamienne zmniejszenie stężenia cholesterolu całkowitego (&#8211;0,49 mmol/l), cholesterolu frakcji lipoprotein innych ni&#191; te o dużej gęstości [(nie-HDL); &#8211;0,53 mmol/l] oraz apolipoproteiny B (&#8211;0,14 mmol/l) w porównaniu z przyjmowaniem podwójnej dawki statyny (p &#163; 0,001 dla wszystkich porównywanych warto&#339;ci). Oba protokoły leczenia miały zbliżony wpływ na stężenia triglicerydów, białka C-reaktywnego i cholesterolu frakcji lipoprotein o dużej gęstości (HDL, high-density protein); porównania pomiędzy grupami przyniosły wartości nieznamienne (p &#8805; 0,160). U istotnie większej liczby pacjentów przyjmujących Eze/Simva stężenie cholesterolu frakcji LDL spadło do poniżej 2,5 mmol/l (< 100 mg/dl; 86% pacjentów leczonych Eze/Simva vs. 72% osób leczonych podwójną dawką statyny), do poniżej 2,0 mmol/l (< 77 mg/dl; 70% vs. 42%) oraz do poniżej 1,8 mmol/l mmol/l (< 70 mg/dl; 60% vs. 13%) w porównaniu z grupą otrzymującą samą statynę (p &#8804; 0,001 dla wszystkich porównywanych wartości). Połączenie preparatów Eze/Simva było ogólnie dobrze tolerowane, a jego profil bezpieczeństwa był zbliżony do profilu samej statyny. Nie stwierdzono różnic pomiędzy grupami pod względem częstości występowania zwyżki aktywności aminotransferaz wątrobowych do wartości równej przynajmniej 3-krotności górnej granicy przedziału warto&#339;ci prawidłowych (ULN) ani zwyżki aktywności kinazy kreatynowej do wartości równej przynajmniej 10-krotności ULN. Wnioski: W populacji pacjentów leczonych wcześniej statyną, których hospitalizowano w celu diagnostyki incydentu wie&#241;cowego, leczenie skojarzonym preparatem Eze/Simva w dawce 10/40 mg przez 12 tygodni powoduje większą normalizację lipemii niż podwojenie dawki przyjmowanej wcze&#339;niej statyny, z zachowaniem zbliżonego profilu bezpieczeństwa

A DOCK8-WIP-WASp complex links T cell receptors to the actin cytoskeleton

Wiskott-Aldrich syndrome (WAS) is associated with mutations in the WAS protein (WASp), which plays a critical role in the initiation of T cell receptor–driven (TCR-driven) actin polymerization. The clinical phenotype of WAS includes susceptibility to infection, allergy, autoimmunity, and malignancy and overlaps with the symptoms of dedicator of cytokinesis 8 (DOCK8) deficiency, suggesting that the 2 syndromes share common pathogenic mechanisms. Here, we demonstrated that the WASp-interacting protein (WIP) bridges DOCK8 to WASp and actin in T cells. We determined that the guanine nucleotide exchange factor activity of DOCK8 is essential for the integrity of the subcortical actin cytoskeleton as well as for TCR-driven WASp activation, F-actin assembly, immune synapse formation, actin foci formation, mechanotransduction, T cell transendothelial migration, and homing to lymph nodes, all of which also depend on WASp. These results indicate that DOCK8 and WASp are in the same signaling pathway that links TCRs to the actin cytoskeleton in TCR-driven actin assembly. Further, they provide an explanation for similarities in the clinical phenotypes of WAS and DOCK8 deficiency.United States. Public Health Service (RO1AI114588)United States. Public Health Service (K08AI114968

A novel primary human immunodeficiency due to deficiency in the WASP-interacting protein WIP

A female offspring of consanguineous parents, showed features of Wiskott-Aldrich syndrome (WAS), including recurrent infections, eczema, thrombocytopenia, defective T cell proliferation and chemotaxis, and impaired natural killer cell function. Cells from this patient had undetectable WAS protein (WASP), but normal WAS sequence and messenger RNA levels. WASP interacting protein (WIP), which stabilizes WASP, was also undetectable. A homozygous c.1301C>G stop codon mutation was found in the WIPF1 gene, which encodes WIP. Introduction of WIP into the patient’s T cells restored WASP expression. These findings indicate that WIP deficiency should be suspected in patients with features of WAS in whom WAS sequence and mRNA levels are normal

Mitochondrial Superoxide Contributes to Blood Flow and Axonal Transport Deficits in the Tg2576 Mouse Model of Alzheimer's Disease

Alzheimer's disease (AD) is a neurodegenerative disease characterized by the progressive decline in cognitive functions and the deposition of aggregated amyloid beta (Abeta) into senile plaques and the protein tau into tangles. In addition, a general state of oxidation has long been known to be a major hallmark of the disease. What is not known however, are the mechanisms by which oxidative stress contributes to the pathology of AD.In the current study, we used a mouse model of AD and genetically boosted its ability to quench free radicals of specific mitochondrial origin. We found that such manipulation conferred to the AD mice protection against vascular as well as neuronal deficits that typically affect them. We also found that the vascular deficits are improved via antioxidant modulation of the endothelial nitric oxide synthase, an enzyme primarily responsible for the production of nitric oxide, while neuronal deficits are improved via modulation of the phosphorylation status of the protein tau, which is a neuronal cytoskeletal stabilizer.These findings directly link free radicals of specific mitochondrial origin to AD-associated vascular and neuronal pathology

Wnt/β-Catenin Signaling Pathway Is a Direct Enhancer of Thyroid Transcription Factor-1 in Human Papillary Thyroid Carcinoma Cells

The Wnt/β-catenin signaling pathway is involved in the normal development of thyroid gland, but its disregulation provokes the appearance of several types of cancers, including papillary thyroid carcinomas (PTC) which are the most common thyroid tumours. The follow-up of PTC patients is based on the monitoring of serum thyroglobulin levels which is regulated by the thyroid transcription factor 1 (TTF-1): a tissue-specific transcription factor essential for the differentiation of the thyroid. We investigated whether the Wnt/β-catenin pathway might regulate TTF-1 expression in a human PTC model and examined the molecular mechanisms underlying this regulation. Immunofluorescence analysis, real time RT-PCR and Western blot studies revealed that TTF-1 as well as the major Wnt pathway components are co-expressed in TPC-1 cells and human PTC tumours. Knocking-down the Wnt/β-catenin components by siRNAs inhibited both TTF-1 transcript and protein expression, while mimicking the activation of Wnt signaling by lithium chloride induced TTF-1 gene and protein expression. Functional promoter studies and ChIP analysis showed that the Wnt/β-catenin pathway exerts its effect by means of the binding of β-catenin to TCF/LEF transcription factors on the level of an active TCF/LEF response element at [−798, −792 bp] in TTF-1 promoter. In conclusion, we demonstrated that the Wnt/β-catenin pathway is a direct and forward driver of the TTF-1 expression. The localization of TCF-4 and TTF-1 in the same area of PTC tissues might be of clinical relevance, and justifies further examination of these factors in the papillary thyroid cancers follow-up

The influence of tumor size and environment on gene expression in commonly used human tumor lines

BACKGROUND: The expression profiles of solid tumor models in rodents have been only minimally studied despite their extensive use to develop anticancer agents. We have applied RNA expression profiling using Affymetrix U95A GeneChips to address fundamental biological questions about human tumor lines. METHODS: To determine whether gene expression changed significantly as a tumor increased in size, we analyzed samples from two human colon carcinoma lines (Colo205 and HCT-116) at three different sizes (200 mg, 500 mg and 1000 mg). To investigate whether gene expression was influenced by the strain of mouse, tumor samples isolated from C.B-17 SCID and Nu/Nu mice were also compared. Finally, the gene expression differences between tissue culture and in vivo samples were investigated by comparing profiles from lines grown in both environments. RESULTS: Multidimensional scaling and analysis of variance demonstrated that the tumor lines were dramatically different from each other and that gene expression remained constant as the tumors increased in size. Statistical analysis revealed that 63 genes were differentially expressed due to the strain of mouse the tumor was grown in but the function of the encoded proteins did not link to any distinct biological pathways. Hierarchical clustering of tissue culture and xenograft samples demonstrated that for each individual tumor line, the in vivo and in vitro profiles were more similar to each other than any other profile. We identified 36 genes with a pattern of high expression in xenograft samples that encoded proteins involved in extracellular matrix, cell surface receptors and transcription factors. An additional 17 genes were identified with a pattern of high expression in tissue culture samples and encoded proteins involved in cell division, cell cycle and RNA production. CONCLUSIONS: The environment a tumor line is grown in can have a significant effect on gene expression but tumor size has little or no effect for subcutaneously grown solid tumors. Furthermore, an individual tumor line has an RNA expression pattern that clearly defines it from other lines even when grown in different environments. This could be used as a quality control tool for preclinical oncology studies

DOCK8 Functions as an Adaptor that Links TLR–MyD88 Signaling to B Cell Activation

DOCK8 and MyD88 have been implicated in serologic memory. Here we report antibody responses were impaired and $CD27^+$ memory B cells were severely reduced in DOCK8-deficient patients. Toll-like receptor 9 (TLR9)- but not CD40-driven B cell proliferation and immunoglobulin production were severely reduced in DOCK8-deficient B cells. In contrast, TLR9-driven expression of AICDA, CD23 and CD86, and activation of NF-κB, p38 and Rac1 were intact. DOCK8 associated constitutively with MyD88 and the tyrosine kinase Pyk2 in normal B cells. Following TLR9 ligation, DOCK8 became tyrosine phosphorylated by Pyk2, bound the Src family kinase Lyn and linked TLR9 to a Src-Syk-STAT3 cascade essential for TLR9-driven B cell proliferation and differentiation. Thus, DOCK8 functions as an adaptor in a TLR9-MyD88 signaling pathway in B cells

Natural Killer Cells from Patients with Recombinase-Activating Gene and Non-Homologous End Joining Gene Defects Comprise a Higher Frequency of CD56bright NKG2A+++ Cells, and Yet Display Increased Degranulation and Higher Perforin Content.

Mutations of the recombinase Activating Genes 1 and 2 (RAG1, RAG2) in humans are associated with a broad range of phenotypes. For patients with severe clinical presentation, hematopoietic stem cell transplantation (HSCT) represents the only curative treatment, however high rates of graft failure and incomplete immune reconstitution have been observed, especially after unconditioned haploidentical transplantation. Studies in mice have shown that Rag-/- NK cells have a mature phenotype, reduced fitness and increased cytotoxicity. We aimed to analyze NK cell phenotype and function in patients with mutations in RAG and in non-homologous end joining (NHEJ) genes. Here we provide evidence that NK cells from these patients have an immature phenotype, with significant expansion of CD56bright CD16-/int CD57- cells, yet increased degranulation and high perforin content. Correlation was observed between in vitro recombinase activity of the mutant proteins, NK cell abnormalities, and in vivo clinical phenotype. Addition of serotherapy in the conditioning regimen, with the aim of depleting the autologous NK cell compartment, may be important to facilitate engraftment and immune reconstitution in patients with RAG and NHEJ defects treated by HSCT