Pupil inversion Mach-Zehnder interferometry for diffraction-limited optical astronomical imaging.

We present theoretical and laboratory experimental results on a robust interferometric device based on pupil inversion, or 180° rotational shearing interferometry. The image of an astronomical object degraded by the atmosphere turbulence can be restored (ideally up to the diffraction limit) by a numerical post-processing of the interferogram. Unlike previous Michelson configurations that return half of the light to the sky, the Mach-Zehnder interferometer has no fundamental losses when both outputs are used. The interferogram is formed by two overlapped images of the telescope pupil, but one of them is spatially inverted, and out of phase by π/2 only in its half. This optical operation is achieved in a robust way by inserting a refractive optical image inverter and a binary phase plate in one of the arms of the interferometer. In this way, the system has no polarization dependence or moving parts since the plate allows the object to be retrieved numerically from just one interferogram (single exposition) or a few independent interferograms. For that, several algorithms are proposed. Likewise, we include a laboratory proof-of-concept in which a diffraction-limited image is obtained in spite of presence of aberrations and photon noise.

c-Kit identifies a subpopulation of mesenchymal stem cells in adipose tissue with higher telomerase expression and differentiation potential.

The stromal vascular fraction (SVF) of adipose tissue is an easy to obtain source of adipose tissue-derived stem cells (ADSCs). We and others have achieved significant but suboptimal therapeutic effects with ADSCs in various settings, mainly due to low rates of differentiation into specific cell types and with the downside of undesired side effects as a consequence of the undifferentiated ADSCs. These data prompted us to find new stem cell-specific markers for ADSCs and/or subpopulations with higher differentiation potential to specific lineages. We found a subpopulation of human ADSCs, marked by c-Kit positiveness, resides in a perivascular location, and shows higher proliferative activity and self-renewal capacity, higher telomerase activity and expression, higher in vitro adipogenic efficiency, a higher capacity for the maintenance of cardiac progenitors, and higher pancreatogenic and hepatogenic efficiency independently of CD105 expression. Our data suggests that the isolation of ADSC subpopulations with anti-c-Kit antibodies allows for the selection of a more homogeneous subpopulation with increased cardioprotective properties and increased adipogenic and endodermal differentiation potential, providing a useful tool for specific therapies in regenerative medicine applications.

[The different manifestations of pulmonary aspergillosis: multidetector computed tomography findings]. / Las diferentes manifestaciones de la aspergilosis pulmonar. Hallazgos en tomografía computarizada multidetector.

Pulmonary aspergillosis is a fungal infection usually caused by inhaling Aspergillus fumigatus spores. However, when we talk about aspergillosis, we normally refer to the spectrum of clinical and radiological findings that depend directly on the patient's immune status, on the prior existence of lung disease, and on the virulence of the infective organism. There are four types of pulmonary aspergillosis (aspergilloma, allergic bronchopulmonary aspergillosis, chronic necrotizing pulmonary aspergillosis, and invasive aspergillosis), and each type has its own distinct radiologic findings. We review the signs of pulmonary aspergillosis on multidetector computed tomography and we correlate them with patients' symptoms and immune responses. Likewise, we discuss the differential diagnoses.

Differences in questing tick species distribution between Atlantic and continental climate regions in Spain.

Climate and vegetation in Spain vary from north to south, affecting tick distribution and consequently the presence of tick-borne diseases. The aim of this study was to investigate throughout a 2-yr study the distribution of the different exophilic questing tick species present in 18 areas: eight located in central and 10 in northern Spain. The same methodology was used in both areas, sampling vegetation on a monthly basis by blanket dragging for 20- to 30-min intervals. A total of 12 species belonging to the genera Ixodes, Haemaphysalis, Rhipicephalus, Dermacentor, and Hyalomma was identified. Differences in species distribution and prevalence were dramatically different. The most frequent and abundant species in northern Spain were Ixodes ricinus (67% of adult ticks) and Haemaphysalis punctata (8%), whereas Hyalomma lusitanicum (86%) and Dermacentor marginatus (12%) were the most abundant in central Spain. There were important differences in the monthly seasonal patterns for the different tick species. These results highlight important differences in tick distribution in neighboring areas and underline the need for ongoing surveillance programs to monitor tick population dynamics and the prevalence of tick-borne pathogens.

[Pulmonary hypertension: the contribution of MDCT to the diagnosis of its different types]. / Hipertensión pulmonar: aportación de la TCMD al diagnóstico de sus distintos tipos.

Pulmonary hypertension is characterized by progressive involvement of the pulmonary vessels that leads to increased vascular resistance and consequently to right ventricular failure. Vascular lesions are a common factor in a wide spectrum of diseases, and their result, pulmonary hypertension, is a severe clinical condition with a poor prognosis that worsens the normal course of the diseases to which it is associated (COPD, collagen disease, sarcoidosis, and congenital or acquired heart disease). It is important for pulmonary hypertension to be diagnosed as early as possible because nowadays drugs can reduce mortality and improve the quality of life; furthermore, some types of pulmonary hypertension (e.g., chronic thromboembolism and those associated with some congenital heart diseases like left-to-right shunt) can be treated surgically. In cases of suspected pulmonary hypertension, imaging methods can confirm the diagnosis, suggest a cause, help choose the most appropriate treatment, and monitor the response to treatment. This review describes the approach to pulmonary hypertension using different imaging techniques; special emphasis is given to the role of multidetector CT (MDCT), which makes it possible to study all the organs in the thorax in a single acquisition. We review the radiological signs of pulmonary hypertension and the current (Dana Point) radiological criteria for classifying the type of hypertension based on alterations in the lung parenchyma, mediastinum, pleural spaces, and pericardium, as well as on the study of the chambers of the heart.

Aortoenteric fistula arising as a complication of endovascular treatment of abdominal aortic aneurysm.

Estimates of the incidence of aortoenteric fistula as a sequela of surgery of the aorta range 1-2%. This complication is less common in patients who have had an aortic endograft implanted for aortoiliac aneurysm. We present three cases of aortoenteric fistula complicating endovascular treatment of abdominal aortic aneurysm (3/423 patients, 0.7% in our series).

Acute iliac artery thrombosis and pulsatile femoral and popliteal veins in the same extremity: a case report.

Systemic venous pressure is elevated in right heart failure, and this elevation may be reflected in pulsatile venous flow when there is significant tricuspid regurgitation. The presence of this systolic reversed flow in the femoral and popliteal veins may result in major difficulties for diagnosis and treatment. We report the case of a patient with signs and symptoms of acute ischemia of the right lower limb with palpable pulse in the groin and popliteal fossa. Tricuspid regurgitation was suspected by clinical examination, and Doppler ultrasonographic examination of the extremity revealed pulsatile flow in the femoral and popliteal veins while the iliac arterial axis was occluded. A preoperative angiogram revealed an underlying iliac artery thrombosis, which was successfully treated.

[Mental development trajectories of a group of preterm babies from 1 to 30 months of age]. / Trayectorias de desarrollo mental de un grupo de bebes prematuros de 1 a 30 meses.

INTRODUCTION: This research falls within the category of longitudinal studies assessing the evolution of prematurely born infants with the use of standardized tests. AIMS: To analyze the trajectory of the mental development of a group of premature infants and to identify if gestational age is a significant predictor of their evolution. SUBJECTS AND METHODS: 359 prematurely born infants were assessed at three stages of their development (between 1-9 months, 10-18 months and 19-30 months of age), using the Bayley Scales of Infant DEVELOPMENT. To analyze the trajectory of the sample mental development, a linear mixed model procedure was applied. RESULTS: The trajectories of the mental development of these children conform to a model of the quadratic development curve. The results show that gestational age is a significant predictor of the initial score that explains 34% of the total interindividual variability. CONCLUSIONS: Children with lowest initial scores are those who most increase them with age, an important fact for the prediction of premature newborns future development. This fact should be taken into account regarding negative prognoses in the first year of life.

TITLE: Trayectorias de desarrollo mental de un grupo de bebes prematuros de 1 a 30 meses.Introduccion. Esta investigacion se inscribe en los estudios de corte longitudinal para evaluar la evolucion de los recien nacidos prematuros con el uso de pruebas estandarizadas. Objetivos. Analizar la trayectoria del desarrollo mental de un grupo de recien nacidos prematuros e identificar si la edad gestacional es un predictor significativo de su evolucion. Sujetos y metodos. Se evaluo a 359 recien nacidos prematuros en tres momentos de su desarrollo (entre 1 y 9 meses, entre 10 y 18 meses, y entre 19 y 30 meses de edad), utilizando las escalas Bayley de desarrollo infantil. Para analizar la trayectoria del desarrollo mental de la muestra se aplico el procedimiento de modelos lineales mixtos. Resultados. Las trayectorias del desarrollo mental de estos niños se ajustan a un modelo de la curva de desarrollo cuadratica. Los resultados muestran que la edad gestacional es un predictor significativo de la puntuacion inicial que explica el 34% del total de la variabilidad interindividual. Conclusiones. Los niños con puntuaciones iniciales mas bajas son los que mas incrementan sus puntuaciones con la edad, un dato importante de cara a la prediccion del futuro desarrollo de los prematuros y que previene sobre la realizacion de pronosticos negativos en el primer año de vida.

Non-tumoural parenchyma in Leydig cell tumours: pathogenetic considerations.

Little is known about the pathogenesis of Leydig cell tumours (LCTs) of the testis. The observation of several associated dysgenetic features in the non-tumoural parenchyma and in the contralateral testes of men with testicular germ cell neoplasms has served as the basis to propose that there may be a common mechanism for different male reproductive disorders. However, the possible relationship between LCTs and other testicular lesions has not been explored. Here we describe the presence of primary lesions in the non-tumoural parenchyma of testes with LCT, from which we try to establish possible pathogenetic associations. We studied the non-tumoural parenchyma adjacent to 16 LCT specimens. Parameters as Leydig cell hyperplasia (LCHY), qualitative evaluation of the germinal epithelium and spermatogenesis, the presence of Sertoli cell-only tubules (SCOT), and the Sertoli cell nuclear morphology were consistently assessed in all cases. SCOT associated with Sertoli cell dysgenetic morphology was the most frequent finding, present in 50% of the cases. Another interesting finding was the presence of LCHY in four cases (25%). Abnormal spermatogenesis was found in 81.25% of the cases, and it consisted of lesions of the adluminal or basal compartments of seminiferous tubules. The occurrence of either dysgenetic Sertoli cells or LCHY adjacent to LCTs could represent primary anomalies, resulting from a common insult also involved in tumourigenesis. The abnormalities in spermatogenesis observed here are likely to represent consequences of either tumour compression or abnormal hormonal production. The significance of these associations merits further investigation regarding a common pathogenesis.

MKP1/CL100 controls tumor growth and sensitivity to cisplatin in non-small-cell lung cancer.

Non-small-cell lung cancer (NSCLC) represents the most frequent and therapy-refractive sub-class of lung cancer. Improving apoptosis induction in NSCLC represents a logical way forward in treating this tumor. Cisplatin, a commonly used therapeutic agent in NSCLC, induces activation of N-terminal-c-Jun kinase (JNK) that, in turn, mediates induction of apoptosis. In analysing surgical tissue samples of NSCLC, we found that expression of MKP1/CL100, a negative regulator of JNK, showed a strong nuclear staining for tumor cells, whereas, in normal bronchial epithelia, MKP1 was localized in the cytoplasm as well as in nuclei. In the NSCLC-derived cell lines H-460 and H-23, we found that MKP1 was constitutively expressed. Expressing a small-interfering RNA (siRNA) vector for MKP1 in H-460 cells resulted in a more efficient activation by cisplatin of JNK and p38 than in the parental cells, and this correlated with a 10-fold increase in sensitivity to cisplatin. A similar response was also observed in H-460 and H-23 cells when treated with the MKP1 expression inhibitor RO-31-8220. Moreover, expression of a siRNA-MKP2, an MKP1-related phosphatase, had no effect on H-460 cell viability response to cisplatin. Tumors induced by H-460 cells expressing MKP1 siRNA grew slower in nu(-)/nu(-) mice and showed more susceptibility to cisplatin than parental cells, and resulted in an impaired growth of the tumor in mice. On the other hand, overexpression of MKP1 in the H-1299 NSCLC-derived cell line resulted in further resistance to cisplatin. Overall, the results showed that inhibition of MKP1 expression contributes to a slow down in cell growth in mice and an increase of cisplatin-induced cell death in NSCLC. As such, MKP1 can be an attractive target in sensitizing cells to cisplatin to increase the effectiveness of the drug in treating NSCLC.

Combined surgical and endovascular repair of a ruptured bilateral aortoiliac aneurysm.

Aortoiliac aneurysms are frequent entities that have very important clinical implications, especially in the younger patients. We are asked not only to save lives by preventing the rupture or repairing those that are already ruptured but also to provide an acceptable quality of life in the postoperative period. Endovascular approaches certainly give us such an expectative but are not clearly indicated in our younger patients and cannot be used routinely in those aneurysms with a yuxtarrenal origin. This is the case report of a young man with a yuxtarrenal aortoiliac inflammatory aneurysm that was treated by the interposition of an aortobifemoral bypass with the addition of endovascular devices in the hypogastric vessels to preserve the pelvic blood flow; they contribute to seal the common iliac aneurysms. This approach was useful to avoid complications during a difficult iliac dissection and was permeable within 1 year of the operation. Durability must be assessed.

Sternal cleft associated with enterogenous cyst treated during the newborn period.

We present the case of a newborn with sternal cleft (SC) and presternal enterogenous cyst operated on during the neonatal period. SC is an uncommon congenital malformation of the thoracic wall which can occur as an isolated form or in association with other malformations. To our knowledge, the presence of SC and enterogenous cyst has not been described to date. Early surgical repair of SC gives good aesthetic and functional results and is usually the preferred approach.

[Diagnostic value of the gonadal biopsy in the disorders of sex development]. / Valor de la biopsia gonadal en el diagnóstico de los desórdenes del desarrollo sexual.

The gonadal biopsy provides essential information for the identification, classification and early detection of neoplasias in patients with disorders of sex development. Histopathological findings in these cases must be analysed together with clinical, hormonal, genetic and molecular information before deciding a therapeutic option. Sexual differentiation is the result of multiple and complex genetic and endocrinal mechanisms; therefore, we first present the events taking place during gonadal embryonic development, focusing on the genetic mechanisms involved in sexual determination and the differentiation of the testis and the urogenital tract. In second place, we describe the different gonads in the intersexual states -in testicular regression syndrome, fibrous streak, testicular dysgenesis, streak testes, ovotestes and microscopically normal testes and ovaries-, highlighting the histological features and the differential findings that allow the pathologist to distinguish between these entities with the aid of clinical, genetic, hormonal and molecular information that are characteristic for each situation. In third place, we studied the incidence of neoplasias in gonadal dysgenesis, male pseudohermaphroditism and true hermaphroditism. Finally, we discuss the limitations of gonadal biopsy to achieve a correct diagnosis in the disorders of sex development.

The oncogene BRAF V600E is associated with a high risk of recurrence and less differentiated papillary thyroid carcinoma due to the impairment of Na+/I- targeting to the membrane.

The oncogene BRAF(V600E) is the most frequent genetic event in papillary thyroid carcinoma (PTC) but its prognostic impact still remains to be elucidated. We evaluated a representative series of 67 individuals with PTC who underwent total thyroidectomy. BRAF-positive tumours correlated with early recurrences (32% vs 7.6%; P=0.02) during a median postoperative follow-up period of 3 years. Interestingly, within the recurrences, a significant majority had negative radioiodine ((131)I) total body scans, predicting a poorer outcome as treatment with (131)I is not effective. This last observation led us to investigate the role of BRAF(V600E) and the MEK-ERK pathway in thyroid dedifferentiation, particularly in Na(+)/I(-) symporter (NIS) impairment, as this thyroid-specific plasma membrane glycoprotein mediates active transport of I(-) into the thyroid follicular cells. A subset of 60 PTC samples was evaluated for NIS immunoreactivity and, accordingly, we confirmed a significant low NIS expression and impaired targeting to membranes in BRAF-positive samples (3.5% vs 30%; P=0.005). Furthermore, experiments with differentiated PCCl3 thyroid cells demonstrated that transient expression of BRAF(V600E) sharply impaired both NIS expression and targeting to membrane and, surprisingly, this impairment was not totally dependent on the MEK-ERK pathway. We have concluded that BRAF(V600E) is a new prognostic factor in PTC that correlates with a high risk of recurrences and less differentiated tumours due to the loss of NIS-mediated (131)I uptake.

Immunohistochemical expression of p53, Bcl-2, COX-2, C-erb-B2, EPO-R, beta-catenin, and E-cadherin in non tumoral gastric mucous membrane.

Different authors have investigated the immunohistochemical expression of some proteins in the adenocarcinoma of the stomach, including cell cycle regulators proteins like p53 and Bcl-2; growth factors (c-erb-B2 and EPO-R); angiogenesis-related markers such as COX-2 and cellular adhesion molecules (beta-catenin and E-cadherin). While these proteins have been studied in gastric adenocarcinoma, their immunophenotyping in non tumoral gastric mucous membrane remains unexplored. In the present study, we investigated the expression, function and behavior of these proteins in normal gastric mucous membrane to contribute to gain further knowledge on the significance of their loss or overexpression in malignant gastric tumors.

Androgen receptor distribution in adult human testis.

The distribution of the androgen receptor (AR) in archival human testes was determined immunocytochemically using an affinity-purified peptide-specific rabbit antibody, PG21, and employing a modified biotin-streptavidin-immunoperoxidase method that incorporated a biotin amplification step. In combination with microwave epitope retrieval, the biotin amplification step increased the sensitivity of the immunostaining assay approximately 20-fold. Thus, the useful range at which PG21 rendered a robust, specific immunostaining signal without also increasing nonspecific background was extended dramatically. Broadening the useful range of the PG21 antibody made it possible to resolve the relative amounts of immunopositive AR in different cell types of the human testis. At a high PG21 concentration, for example, all AR-positive cells exhibited a robust immunostaining intensity, but it was not possible to distinguish between nuclei exhibiting either high or moderate immunostaining intensities. In contrast, as the concentration of PG21 was decreased, distinct populations of testicular cells exhibited differential AR immunostaining intensities in their nuclei. AR immunostaining of Sertoli cell nuclei was present at low PG21 concentrations at which no immunostaining of peritubular myoid cells or Leydig cells could be detected. In turn, AR immunostaining of peritubular myoid cells was detected at PG21 concentrations that did not immunostain Leydig cells. Moreover, within the seminiferous epithelium, Sertoli cell nuclear AR staining intensity was less at stages V and VI of the cycle of the seminiferous epithelium than that at stage III, and stage III staining intensity was greater than that at stages I and II. This AR immunostaining pattern in human Sertoli cell nuclei as a function of the cycle of the seminiferous epithelium is reminiscent of the pattern observed in rodent species. Finally, no AR immunostaining of germ cells was observed at any of the PG21 concentrations examined.

Androgen receptor expression in sertoli cells as a function of seminiferous tubule maturation in the human cryptorchid testis.

Androgen receptor (AR) immunohistochemistry was performed in an archival collection of adult human cryptorchid testes to determine whether AR cellular distribution and intensity of immunostaining were functions of the severity of cellular dysgenesis. The seminiferous tubule histology of cryptorchid testes collected from adults is marked by three specific patterns. 1) Seminiferous tubules are characterized as maintaining focal areas of germinal cell differentiation (albeit incomplete) that are interspersed with 2) tubules composed of Sertoli cells only, these latter cells being principally of the adult type, although dysgenetic and immature Sertoli cells may also be detected. 3) In contrast, there is a class of tubule that is characterized as being composed exclusively of Sertoli cells that are extremely dysgenetic in appearance. The majority of adult-type Sertoli cells found in the first types of tubules exhibited either robust or moderate AR staining intensity. Peritubular cells of these tubules also expressed a similar AR staining intensity. In contrast, in the more dysgenetic and immature type Sertoli cells found in the second type of tubules, the intensity of AR staining was significantly less, if not missing altogether. Finally, in the most dysgenetic tubules, Sertoli cell AR staining was never detected. To our knowledge, this is the first report in the literature that addresses the intensity of AR immunostaining in Sertoli cells of cryptorchid testes. The results presented herein are consistent with the interpretation that the intensity of AR staining in Sertoli cells diminishes as a function of the severity to which the cells are afflicted within a cryptorchid testis and that focal absence of AR expression in Sertoli cells correlates with a lack of local spermatogenesis in the tubules.