Cryoglobulinaemia vasculitis in patients coinfected with HIV and hepatitis C virus

OBJECTIVE: To describe mixed cryoglobulinaemia (MC) vasculitis in patients coinfected with hepatitis C virus (HCV) and HIV. DESIGN: Retrospective multicentre study through the GERMIVIC Database of 4005 HIV/HCV-coinfected patients. METHODS: The characteristics and outcome of 11 HIV/HCV-coinfected patients with MC vasculitis were analysed and compared with those of 118 HCV-infected patients with MC vasculitis. RESULTS: The mean age was 46 years (SD, 14), with 82% male. The median initial CD4 cell count was 367 cells/microl (range, 252-846). After a mean follow-up of 44.4 months, two deaths (18%) were noted. Clinical manifestations of MC included polyneuropathy in seven (64%), purpura in four (36%), arthralgia in four (36%), and kidney involvement in three (27%). Six patients received combination treatment with interferon-alfa and ribavirin, three of whom had sustained HCV virological response and were complete clinical responders. Four patients received corticosteroids and two showed a partial clinical response. Regardless of the HIV virological response, antiretroviral therapy did not improve MC vasculitis. Compared with patients with HCV monoinfection, coinfected patients were younger (P < 0.001), more frequently male (P = 0.03), more frequently intravenous drug users (P < 0.001), had higher HCV viraemia (P = 0.004), higher liver necroinflammation (P = 0.03), higher gammaglobulinaemia (P < 0.001) and lower cryoglobulin level (P = 0.03). The clinical manifestations of MC vasculitis did not differ significantly between the two groups. CONCLUSION: There was a beneficial effect of anti-HCV therapy for HIV/HCV-coinfected patients with MC vasculitis.     

Water transport becomes uncoupled from K+ siphoning in brain contusion, bacterial meningitis, and brain tumours: immunohistochemical case review

Specimens of normal human brain, contused brain, brain with bacterial meningitis, and brain tumours were immunolabelled for aquaporin 4 (AQP4) and Kir4.1. In normal brain tissue, AQP4 and Kir4.1 were detected around the microvessels. In pathological brain tissue, AQP4 was upregulated in astrocytes in oedematous regions and Kir4.1 was upregulated in astrocytes in damaged brain. Changes in alpha syntrophin expression paralleled those of AQP4 and Kir4.1. The following hypothesis is proposed: in astrocytes, under normal conditions, AQP4 couples water transport with Kir4.1 mediated K+ siphoning, but in pathological states, AQP4 facilitates the flow of brain oedema fluid, and Kir4.1 buffers increased extracellular K+.     

Hepatitis B virus genotypes and extrahepatic manifestations

BACKGROUND/AIMS: This study aimed at correlating the presence of extrahepatic manifestations with hepatitis B virus (HBV) genotypes in patients with chronic HBV infection. METHODS: This was a national (France), multicenter, retrospective, cross-sectional study. HBV genotypes were determined in 190 patients HBsAg-positive for at least 6 months and documented before any treatment. RESULTS: Patients were aged 42+/-15 years and mainly male (77%). Alcohol intake was high in 6% of them, ALT elevated in 73%; 27% were cirrhotic. All HBV genotypes were found, mainly A (24%), D (29%), C (11%), and E (10%). Thirty (16%) patients had clinical extrahepatic manifestations, mainly sensory-motor deficiency, sicca syndrome, myalgia, glomerulonephritis, and arthralgia-arthritis. Their presence was not related to any epidemiologic, viral (including genotypes) or hepatic factor, but to a higher platelet count (P=0.004). Twenty-nine (15%) patients had biological extrahepatic manifestations, mainly anti-smooth muscle, antinuclear, and anti-nucleosome antibodies. Their presence was related only to anti-HBe antibodies positivity (P=0.007) or elevated platelet count (P=0.003). Carrying precore mutant HBV increased by 2.8 folds the risk to have at least one extrahepatic biological manifestation. CONCLUSIONS: No relationships between HBV genotypes and the presence of extrahepatic manifestations were evidenced in patients with chronic HBV infection.     

Increased aquaporin 1 water channel expression in human brain tumours

Aquaporin 1 is a water channel protein. There was little aquaporin 1 immunoreactivity in normal brain parenchyma. In astrocytomas, aquaporin 1 was expressed in microvessel endothelia and neoplastic astrocytes. In metastatic carcinomas, aquaporin 1 was present in microvessel endothelia and reactive astrocytes. Aquaporin 1 may participate in the formation of brain tumour oedema.     

Les manifestations oculaires de la maladie de Behçet

Uveitis is the most common ocular symptom in Behçet's disease. It is considered as a diagnostic criterion of the disease. Anterior uveitis is always non granulomatous, and sometimes associated with hypopion. Posterior involvement may include vitritis, retinal infiltrates, sheathing of retinal veins, occlusive vasculitis, and macular edema. Behçet's disease is chronic, and characterized by a spontaneously relapsing and remitting course. Male patients with younger age at onset and worse visual acuity at presentation, have higher risk of visual loss over time. The main goals in the management of patients with Behçet's disease-associated uveitis are rapid suppression of intraocular inflammation, preservation of vision, prevention of recurrences, and achievement of remission sustained after discontinuation of treatment. New therapeutic strategies such as interferon alpha and TNF alpha blockers have dramatically improved the visual prognosis of patients with intraocular inflammation related to this chronic and potentially blinding condition.