[Lingual necrosis as a form of presentation of temporary arteritis]. / Necrosis lingual como forma de presentación de arteritis temporal.

Giant cell arteritis is a systemic vasculitis that affects arteries of medium and large caliber, mainly the aorta artery and its main branches. It is more frequent in women older than 50 years. The most common symptoms are fever, jaw claudication, headache, hyperesthesia of the scalp and loss of vision with anterior ischemic optic nerve disease. But, in a minority of cases, less frequent symptoms are observed that delay and make more difficult the diagnosis. Here, we present the case of a 76-year-old woman who came to our consultation having pain in the oral cavity and presenting tongue and neck edema for 48 hours. She had also suffered from headaches during the previous month. Because the physical examination showed clinical signs of lingual ischemia, a presumptive diagnosis of ischemic involvement due to giant cell arteritis was considered. She started a treatment with systemic corticosteroids and a temporal artery biopsy was performed. We conclude, that giant cell arteritis should be suspected in patients presenting lingual ischemia symptoms in order to start the specific treatment early enough to avoid irreversible complications.

La arteritis de células gigantes es una vasculitis sistémica que compromete arterias de mediano y gran calibre, principalmente la arteria aorta y sus ramas. Su prevalencia es mayor en mujeres a partir de los 50 años, típicamente se manifiesta con fiebre, claudicación mandibular, cefalea, hiperestesia del cuero cabelludo y pérdida de la visión con neuropatía óptica isquémica anterior, en una minoría de casos aparecen síntomas menos frecuentes que dificultan y retrasan el diagnóstico. Se presenta el caso de una mujer de 76 años que consultó por dolor en la cavidad bucal con edema lingual y en cuello de 48 horas de evolución asociado a cefalea el mes previo. En el examen físico presentaba signos clínicos de isquemia lingual, por lo que se consideró como diagnóstico presuntivo compromiso isquémico por arteritis de células gigantes, e inició tratamiento con corticoides sistémicos realizándose una biopsia de arteria temporal que evidenció infiltrado linfocitario panparietal con engrosamiento de la túnica íntima y hallazgos compatibles con panarteritis. La arteritis de células gigantes debe ser sospechada en pacientes con manifestaciones de isquemia lingual, iniciándose en forma precoz el tratamiento para evitar complicaciones irreversibles.

Necrosis lingual como forma de presentación de arteritis temporal / Lingual necrosis as a form of presentation of temporary arteritis

La arteritis de células gigantes es una vasculitis sistémica que compromete arterias de mediano y gran calibre, principalmente la arteria aorta y sus ramas. Su prevalencia es mayor en mujeres a partir de los 50 años, típicamente se manifiesta con fiebre, claudicación mandibular, cefalea, hiperestesia del cuero cabelludo y pérdida de la visión con neuropatía óptica isquémica anterior, en una minoría de casos aparecen síntomas menos frecuentes que dificultan y retrasan el diagnóstico. Se presenta el caso de una mujer de 76 años que consultó por dolor en la cavidad bucal con edema lingual y en cuello de 48 horas de evolución asociado a cefalea el mes previo. En el examen físico presentaba signos clínicos de isquemia lingual, por lo que se consideró como diagnóstico presuntivo compromiso isquémico por arteritis de células gigantes, e inició tratamiento con corticoides sistémicos realizándose una biopsia de arteria temporal que evidenció infiltrado linfocitario panparietal con engrosamiento de la túnica íntima y hallazgos compatibles con panarteritis. La arteritis de células gigantes debe ser sospechada en pacientes con manifestaciones de isquemia lingual, iniciándose en forma precoz el tratamiento para evitar complicaciones irreversibles.

Giant cell arteritis is a systemic vasculitis that affects arteries of medium and large caliber, mainly the aorta artery and its main branches. It is more frequent in women older than 50 years. The most common symptoms are fever, jaw claudication, headache, hyperesthesia of the scalp and loss of vision with anterior ischemic optic nerve disease. But, in a minority of cases, less frequent symptoms are observed that delay and make more difficult the diagnosis. Here, we present the case of a 76-year-old woman who came to our consultation having pain in the oral cavity and presenting tongue and neck edema for 48 hours. She had also suffered from headaches during the previous month. Because the physical examination showed clinical signs of lingual ischemia, a presumptive diagnosis of ischemic involvement due to giant cell arteritis was considered. She started a treatment with systemic corticosteroids and a temporal artery biopsy was performed. We conclude, that giant cell arteritis should be suspected in patients presenting lingual ischemia symptoms in order to start the specific treatment early enough to avoid irreversible complications.

Proteus mirabilis uroepithelial cell adhesin (UCA) fimbria plays a role in the colonization of the urinary tract.

Urinary tract infections (UTIs) are among the most common bacterial infections in humans. Proteus mirabilis is an opportunistic pathogen, capable of causing severe UTIs, with serious kidney damage that may even lead to death. Several virulence factors are involved in the pathogenicity of this bacterium. Among these, adherence to the uroepithelium mediated by fimbriae appears to be a significant bacterial attribute related to urovirulence. Proteus mirabilis expresses several types of fimbriae that could be involved in the pathogenesis of UTI, including uroepithelial cell adhesin (UCA). In this report, we used an uropathogenic P. mirabilis wild-type strain and an isogenic ucaA mutant unable to express UCA to study the pathogenic role of this fimbria in UTI. Ability of the mutant to adhere to desquamated uroepithelial cells and to infect mice using different experimental UTI models was significantly impaired. These results allow us to conclude that P. mirabilis UCA plays an important role in the colonization of the urinary tract.

Mucosal vaccination of mice with recombinant Proteus mirabilis structural fimbrial proteins.

Proteus mirabilis, a common cause of urinary tract infection (UTI), expresses several types of fimbria including mannose-resistant/Proteus-like fimbriae (MRP), uroepithelial cell adhesin (UCA), renamed non-agglutinating fimbriae (NAF) by some authors, and P. mirabilis fimbriae (PMF), which are potentially involved in adhesion to the uroepithelium. In this study, we immunised different groups of mice with recombinant structural subunits of these fimbriae (MrpA, UcaA and PmfA) using two mucosal routes (nasal and transurethral) and we transurethrally challenged the animals with a P. mirabilis uropathogenic isolate. Induction of specific serum and urine IgG and IgA was measured to assess the potential role of the humoral immune response in protection against experimental ascending P. mirabilis UTI. Intranasally MrpA- and UcaA-immunised mice were protected against P. mirabilis ascending UTI, since recovery of bacteria from kidneys and bladders was significantly lower than in PBS-treated mice, and both fimbrial subunits significantly induced specific serum and urine antibodies. Only MrpA and PmfA transurethrally immunised animals were protected only at the kidney level, and in this case only MrpA-immunised mice exhibited significant serum IgG induction. Correlation analysis did not show a significant relationship between serum and urine specific antibody response and protection observed against infection. Our results suggest that an immunisation strategy based on structural fimbrial proteins may be useful to prevent P. mirabilis UTI. Further studies are being carried out to characterise the immune and inflammatory response induced by P. mirabilis recombinant fimbrial subunits.

Evaluation of Proteus mirabilis structural fimbrial proteins as antigens against urinary tract infections.

Proteus mirabilis is a common cause of urinary tract infection (UTI) and produce several types of different fimbriae, including mannose-resistant/Proteus-like fimbriae, uroepithelial cell adhesin (UCA), and P. mirabilis fimbriae (PMF). Different authors have related these fimbriae with different aspects of P. mirabilis pathogenesis, although the precise role of fimbriae in UTI has not yet been elucidated. In this work we expressed and purified recombinant structural fimbrial proteins of these fimbriae (MrpA, UcaA, and PmfA) and assessed their role as protective antigens using an ascending and a haematogenous model of UTI in the mouse. MrpA protected subcutaneously immunised mice in both models, suggesting that it could be taken into account as a promising vaccine candidate against P. mirabilis UTI. UcaA could also be an interesting subunit to be studied although it only protected mice that were challenged intravenously. All subunits elicited a strong specific serum IgG response but there was no significant correlation between antibody levels and protection. Only PmfA-immunised mice elicited a significant urinary antibody response but this protein was unable to confer protection against P. mirabilis experimental challenges. These results may contribute to the development of vaccines against P. mirabilis, an important cause of complicated UTI.