Guadalajara, Mexico
Guadalajara, Mexico

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Ramos-Solano M.,Instituto Mexicano del Seguro Social IMSS | Ramos-Solano M.,University of Guadalajara | Meza-Canales I.D.,Max Planck Institute for Chemical Ecology | Torres-Reyes L.A.,Instituto Mexicano del Seguro Social IMSS | And 13 more authors.
Experimental Cell Research | Year: 2015

According to the multifactorial model of cervical cancer (CC) causation, it is now recognized that other modifications, in addition to Human papillomavirus (HPV) infection, are necessary for the development of this neoplasia. Among these, it has been proposed that a dysregulation of the WNT pathway might favor malignant progression of HPV-immortalized keratinocytes. The aim of this study was to identify components of the WNT pathway differentially expressed in CC vs. non-tumorigenic, but immortalized human keratinocytes. Interestingly, WNT7A expression was found strongly downregulated in cell lines and biopsies derived from CC. Restoration of WNT7A in CC-derived cell lines using a lentiviral gene delivery system or after adding a recombinant human protein decreases cell proliferation. Likewise, WNT7A silencing in non-tumorigenic cells markedly accelerates proliferation. Decreased WNT7A expression was due to hypermethylation at particular CpG sites. To our knowledge, this is the first study reporting reduced WNT7A levels in CC-derived cells and that ectopic WNT7A restoration negatively affects cell proliferation and migration. © 2015 Elsevier Inc.

Ochoa-Hernandez A.B.,Instituto Mexicano del Seguro Social IMSS | Ochoa-Hernandez A.B.,University of Guadalajara | Ramos-Solano M.,CIBO IMSS | Meza-Canales I.D.,CIBO IMSS | And 11 more authors.
BMC Cancer | Year: 2012

Background: WNT7a, a member of the Wnt ligand family implicated in several developmental processes, has also been reported to be dysregulated in some types of tumors; however, its function and implication in oncogenesis is poorly understood. Moreover, the expression of this gene and the role that it plays in the biology of blood cells remains unclear. In addition to determining the expression of the WNT7A gene in blood cells, in leukemia-derived cell lines, and in samples of patients with leukemia, the aim of this study was to seek the effect of this gene in proliferation.Methods: We analyzed peripheral blood mononuclear cells, sorted CD3 and CD19 cells, four leukemia-derived cell lines, and blood samples from 14 patients with Acute lymphoblastic leukemia (ALL), and 19 clinically healthy subjects. Reverse transcription followed by quantitative Real-time Polymerase chain reaction (qRT-PCR) analysis were performed to determine relative WNT7A expression. Restoration of WNT7a was done employing a lentiviral system and by using a recombinant human protein. Cell proliferation was measured by addition of WST-1 to cell cultures.Results: WNT7a is mainly produced by CD3 T-lymphocytes, its expression decreases upon activation, and it is severely reduced in leukemia-derived cell lines, as well as in the blood samples of patients with ALL when compared with healthy controls (p ≤0.001). By restoring WNT7A expression in leukemia-derived cells, we were able to demonstrate that WNT7a inhibits cell growth. A similar effect was observed when a recombinant human WNT7a protein was used. Interestingly, restoration of WNT7A expression in Jurkat cells did not activate the canonical Wnt/β-catenin pathway.Conclusions: To our knowledge, this is the first report evidencing quantitatively decreased WNT7A levels in leukemia-derived cells and that WNT7A restoration in T-lymphocytes inhibits cell proliferation. In addition, our results also support the possible function of WNT7A as a tumor suppressor gene as well as a therapeutic tool. © 2012 Ochoa-Hernández et al; BioMed Central Ltd.

Brambila Tapia A.J.L.,University of Guadalajara | Vasquez Velasquez A.I.,CIBO IMSS | Gonzalez Mercado M.G.,University of Guadalajara | MacIas Chumacera A.,Instituto Nacional Of Cardiologia Dr Ignacio Chavez | And 5 more authors.
Genetic Counseling | Year: 2012

Faciocardiorenal syndrome (FCRS), also named Eastman-Bixler syndrome, is an apparent autosomal recessive entity, characterized by endocardial fibroelastosis, unusual facial appearance, renal defects and mental retardation. We report a 7 months male patient, with the diagnosis of endocardial fibroelastosis, an abnormal facial appearance (arched eyebrows, broad nasal root, long philtrum and microretrognathia) and psychomotor delay. Associated anomalies were: plagiocephaly, broad halluces, nail hypoplasia, cryptorchidism, diastasis recti, and adducted thumbs. Focal seizures in the mouth were also observed. The radiographs revealed advanced bone age and metaphyseal widening of femur and tibia. FCRS has an unknown etiology with only three reported cases so far (since 1977). We report a patient with the main features of FCRS but without the renal component, suggesting that this entity can present a wide clinical spectrum. Based on these findings and on the few previously reported cases with a highly variable phenotype when compared with the original report, we suggest that FCRS should be further clinical delineated according to the following leading anomalies: endocardial fibroelastosis, unusual facial appearance and mental retardation, in order to find more cases that allow a wider clinical description and the identification of the genetic defect(s).

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