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OBJECTIVES: Automated systems to analyse nailfold videocapillaroscopy (NVC) images are needed to promptly and comprehensively characterise patients with systemic sclerosis (SSc) or Raynaud's phenomenon (RP). We previously developed, and validated in-house, a deep convolutional neural network-based algorithm to classify NVC-captured images according to the presence/absence of structural abnormalities and/or microhaemorrhages. We present its external clinical validation. METHODS: A total of 1,164 NVC images of RP patients were annotated by 5 trained capillaroscopists according to the following categories: normal capillary; dilation; giant capillary; abnormal shape; tortuosity; microhaemorrhage. The images were also presented to the algorithm. Matches and discrepancies between algorithm predictions and those annotations obtained by consensus of ≥3 or ≥4 interobservers were analysed. RESULTS: Consensus among ≥3 capillaroscopists was achieved in 86.9% of images, 75.8% of which were correctly predicted by the algorithm. Consensus among ≥4 experts occurred in 52.0% of cases, in which 87.1% of the algorithm's results matched with those of the expert panel. The algorithm's positive predictive value was >80% for microhaemorrhages and unaltered, giant or abnormal capillaries. Sensitivity was >75% for dilations and tortuosities. Negative predictive value and specificity were >89% for all categories. CONCLUSIONS: This external clinical validation suggests that this algorithm is useful to assist in the diagnosis and follow-up of SSc or RP patients in a timely manner. It may also be helpful in the management of patients with any pathology presenting with microvascular changes, as the algorithm has been designed to also be useful for research aiming at extending the usage of nailfold capillaroscopy to more conditions.

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La esclerodermia sistémica (ES) puede asociarse con otros trastornos del tejido conectivo, como dermatomiositis o poliomiositis, síndrome de Sjôgren, artritis reumatoide y lupus eritematoso sistémico. Con menos frecuencia se ha descrito asociación con lupus eritematoso cutáneo discoide(LECD). Cuando un mismo paciente cumple simultáneamente los criterios para dos o más enfermedades del tejido conectivo, se realiza el diagnóstico de síndrome de superposición (SS). Presentamos el caso de una mujer de 32 años, que consultó por presentar placas deprimidas hipopigmentadas en zonas fotoexpuestas de 2 años de evolución, y fenómeno de Raynaud (FR) de 1 año de evolución. Además, telangiectasias en tronco, labios y cara. En manos se observan úlceras digitales dolorosas en pulpejos de los dedos, edema, esclerodactilia y esclerosis del dorso. En laboratorio destacó ANA (1/80 con patrón moteado), perfil ENA (133 con anticuerpo anti-Ro/SS-A en 47) y biopsia de piel compatible con lupus discoide. Se diagnostica SS cutáneosistémico, con LECD y ES limitada. Se realiza una breve revisión bibliográfica de los casos publicados con esta asociación, con un total de 20 casos reportados al año 2010. Las enfermedades reumatológicas pueden manifestarse inicialmente de manera inespecífica, presentando clínica común entre ellas, como es el caso del FR. Es por esta razón que es relevante determinar un diagnóstico en forma temprana, para definir el manejo y búsqueda de complicaciones asociadas a este. Pese a esto el diagnóstico puede ir modificándose en el tiempo principalmente por la aparición de nueva sintomatología.

Systemic Scleroderma (SS) can be associated to other connective tissue disordes such as Dermatomyositis, Polymiositis, Sjogren Syndrome, Rheumatoid Arthritis and Systemic Erythematosus Lupus. With less frecuency the association to Cutaneus Discoid Erithematosus Lupus (CDEL) has been described. When the same patient presents two or more criteria for a connective tissue disorder Overlap Syndrome (OS) is diagnosed. We present the case of a 32 year-old woman that consulted by presenting hypopigmented depressed plates in sun-exposed áreas for two years and Raynaud phenomenon (RPh) for one year. Also she had chest , lips and facial telangiectasia. She presented painful digital ulcers in her finger pads and edema, sclerodactyly and dorsal sclerosis. Laboratory findings showed ANA (1/80 motted pattern ) , ENA profile ( 133 with anti-Ro/SS-A in 47 ) and a cutaneous biopsy compatible with Discoid Lupus. The diagnosis was Cutaneo-Systemic OS with DCEL and limited SS. In this context we made a bibliographyc review of this published association finding a total of 20 cases in year 2010. Rheumatologic diseases can initially manifest in inespecific ways showing common clinical findings such as RPh. This is why it is relevant to make an early diagnosis in order to define treatment and search for associated complications. Despite this the diagnosis can be modified in time mostly because of the appearance of new symtoms.

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We have demonstrated previously that the seven-nucleotide (nt) motif TTTTGTA (the heptamer) that is present within the proximal 3' untranslated sequences of numerous immediate-early genes is essential for platelet-derived growth factor (PDGF)-stimulated induction of the MCP-1 immediate-early gene. On this basis, the heptamer was suggested to be a conserved regulatory element involved in immediate-early gene expression, although its mechanism of action was unknown. Herein, we demonstrate that the heptamer functions to remove an inhibition of PDGF induction of MCP-1 maintained by two independently acting inhibitory elements present in the MCP-1 5' flanking sequences (designated I* elements). PDGF treatment relieves the I*-mediated inhibition of MCP-1 expression only if the heptamer is also present. One inhibitory element is contained within a 59-nt portion of MCP-1 5' flanking sequences and functions in an orientation-independent and heptamer-regulated manner. Significantly, proteins binding to two DNA sequences contribute to the formation of a single multiprotein complex on the 59-nt I* element. The I*-binding complex contains Sp3, an Sp1-like protein, and a novel DNA-binding protein. Moreover, the complex does not form on two 59-nt sequences containing mutations that reverse the inhibition of PDGF induction maintained by the wild-type I* element. We propose to call the multiprotein I*-binding complex a repressosome and suggest that it acts to repress PDGF-stimulated transcription of MCP-1 in the absence of the heptamer TTTTGTA.

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The Orce skull fragment from southern Spain, dated at 1.6 Myr, has been a subject of heated controversy since it was first discovered in 1982. If it is hominid, as its discoverers contend, it is by far the oldest fossil hominid yet found in western Europe and implies that human populations settled this region much earlier than was previously realized. Numerous stone artifacts found at the Orce sites provide evidence that hominids were indeed present there in the Lower Pleistocene. Some paleontologists maintain that the 8 cm diameter occipital fragment is from a horse, not a hominid. Two independent investigations of the residual proteins in the skull were undertaken, one at the University of Granada in Spain, the other at the University of California, San Francisco. Two immunological methods of comparable sensitivity were employed for detection and species attribution of protein extracted from fossil bone: the Granada team used an enzyme-linked-immunosorbent assay (ELISA), and the UCSF team used a radioimmunoassay (RIA). Both teams obtained reactions characteristic of human albumin in the Orce skull and horse albumin in some of the horse fossils. These results support the lithic evidence that hominids were living in Andalusia 1.6 million years ago.

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Although decidual stromal cells (DSC) have classically been considered to play a nutritional role during pregnancy, several reports have demonstrated that they can also exert different immune activities. Furthermore, some authors have occasionally found antigens on DSC normally expressed by immune cells. In this study, we isolated and cultured 12 human DSC lines and studied them with immunocytochemistry and flow cytometry using monoclonal antibodies against antigens associated with hematopoietic cells. Decidual stromal cells exhibited a constant phenotype: they were CALLA (CD10)-positive and DR-positive, although the expression of CD45, the leukocyte common antigen, was found to be very weak or negative. We also detected myelomonocytic antigens CD11b (CR3), CD13, CD16 (Fc gamma RIII) and CD36, although DSC lacked CD14, CD15 and CD33. B cell antigens CD20, CD21 (CR3), CD23 (Fc epsilon RII) and CD24 were expressed. DRC-1, an antigen detected on follicular dendritic cells (FDC), was also observed on DSC. When these cells were cultured in the presence of progesterone, they expressed desmin and prolactin (PRL), findings that confirmed their identity as DSC. The phenotype described, together with the immune activities reportedly carried out by DSC, suggest that DSC may play a role in the maternal-fetal immune relationship.

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PROBLEM: Although several studies have demonstrated that decidual stromal cells (DSC) can secrete cytokines in culture, none of these studies documented the purity of the cultures. Since other cells of the decidua, such as macrophages and epithelial cells, also produce cytokines, it is important to ensure purity of the culture so that cytokine production can be ascribed with confidence to DSC. METHOD: DSC from early human pregnancies were highly purified and maintained in culture. Basal secretion by these cells of IL-6, together with other cytokines considered critical for pregnancy (IL-1 beta, TNF alpha and IFN gamma), was measured with immunological techniques. RESULTS: We found that DSC in culture produce insignificant quantities of IL-1 beta, TNF alpha and IFN gamma, but appreciable amounts of IL-6. The production of this later cytokine was, however, inhibited by the effect of progesterone. CONCLUSIONS: Basal production of IL-6 by DSC may be involved in physiological functions at the maternal-fetal interface. Nevertheless, the secretion of this cytokine is regulated by progesterone, probably to prevent excessive production of this cytokine from triggering an inflammatory response that might compromise pregnancy.

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Identification of a new enterotoxin was accomplished by purification of the enterotoxin produced by staphylococcal strain FRI-326 and by preparation of specific antitoxin to the enterotoxin. Toxicity of the preparations was determined in rhesus monkeys, and specificity of the enterotoxin-antitoxin reaction was determined in gel diffusion plates. The enterotoxin was designated enterotoxin E.

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