Fungal Planet description sheets: 1436-1477.

Novel species of fungi described in this study include those from various countries as follows: Argentina, Colletotrichum araujiae on leaves, stems and fruits of Araujia hortorum. Australia, Agaricus pateritonsus on soil, Curvularia fraserae on dying leaf of Bothriochloa insculpta, Curvularia millisiae from yellowing leaf tips of Cyperus aromaticus, Marasmius brunneolorobustus on well-rotted wood, Nigrospora cooperae from necrotic leaf of Heteropogon contortus, Penicillium tealii from the body of a dead spider, Pseudocercospora robertsiorum from leaf spots of Senna tora, Talaromyces atkinsoniae from gills of Marasmius crinis-equi and Zasmidium pearceae from leaf spots of Smilaxglyciphylla. Brazil, Preussia bezerrensis from air. Chile, Paraconiothyrium kelleni from the rhizosphere of Fragaria chiloensis subsp. chiloensis f. chiloensis. Finland, Inocybe udicola on soil in mixed forest with Betula pendula, Populus tremula, Picea abies and Alnus incana. France, Myrmecridium normannianum on dead culm of unidentified Poaceae. Germany, Vexillomyces fraxinicola from symptomless stem wood of Fraxinus excelsior. India, Diaporthe limoniae on infected fruit of Limonia acidissima, Didymella naikii on leaves of Cajanus cajan, and Fulvifomes mangroviensis on basal trunk of Aegiceras corniculatum. Indonesia, Penicillium ezekielii from Zea mays kernels. Namibia, Neocamarosporium calicoremae and Neocladosporium calicoremae on stems of Calicorema capitata, and Pleiochaeta adenolobi on symptomatic leaves of Adenolobus pechuelii. Netherlands, Chalara pteridii on stems of Pteridium aquilinum, Neomackenziella juncicola (incl. Neomackenziella gen. nov.) and Sporidesmiella junci from dead culms of Juncus effusus. Pakistan, Inocybe longistipitata on soil in a Quercus forest. Poland, Phytophthora viadrina from rhizosphere soil of Quercus robur, and Septoria krystynae on leaf spots of Viscum album. Portugal (Azores), Acrogenospora stellata on dead wood or bark. South Africa, Phyllactinia greyiae on leaves of Greyia sutherlandii and Punctelia anae on bark of Vachellia karroo. Spain, Anteaglonium lusitanicum on decaying wood of Prunus lusitanica subsp. lusitanica, Hawksworthiomyces riparius from fluvial sediments, Lophiostoma carabassense endophytic in roots of Limbarda crithmoides, and Tuber mohedanoi from calcareus soils. Spain (Canary Islands), Mycena laurisilvae on stumps and woody debris. Sweden, Elaphomyces geminus from soil under Quercus robur. Thailand, Lactifluus chiangraiensis on soil under Pinus merkusii, Lactifluus nakhonphanomensis and Xerocomus sisongkhramensis on soil under Dipterocarpus trees. Ukraine, Valsonectria robiniae on dead twigs of Robinia hispida. USA, Spiralomyces americanus (incl. Spiralomyces gen. nov.) from office air. Morphological and culture characteristics are supported by DNA barcodes. Citation: Tan YP, Bishop-Hurley SL, Shivas RG, et al. 2022. Fungal Planet description sheets: 1436-1477. Persoonia 49: 261-350. https://doi.org/10.3767/persoonia.2022.49.08.

Mechanisms of CD23 hyperexpression on B cells from patients with rheumatoid arthritis.

OBJECTIVE: To analyze the mechanisms involved in the characteristic hyperexpression of CD23 on peripheral blood B cells from patients with rheumatoid arthritis (RA). METHODS: Peripheral blood mononuclear cells (PBMC) were obtained from patients with active disease and activated during 18 h with an anti-CD3 monoclonal antibody in the presence or absence of blocking antibodies to CD154 or CD40. PBMC were further purified by rosetting and CD23 expression was assessed on B cells by flow cytometry after double staining (CD19/CD23). Lymphocytes were also isolated from synovial fluid (SF). CD154 expression was analyzed on PB or SF CD4+ T cells after double staining (CD4/CD154) by flow cytometry at basal conditions and after different stimuli [anti-CD3 or phorbol myristic acetate (PMA) plus ionomycin]. Co-culture experiments between SF and PB cells were performed to analyze the involvement of the CD40-CD154 interaction on CD23 expression. CD154 and CD23 expression was also analyzed on synovial membrane by immunohistochemical techniques. RESULTS: A high proportion of activated CD23 B cells was detected in patients with RA. Blocking experiments with both anti-CD40 and anti-CD154 Mab showed a significant reduction in the proportion of PB B cells expressing CD23. Following activation with anti-CD3 Mab or PMA plus ionomycin, CD154 expression was mainly induced on PB CD4+ T cells. In co-culture experiments, SF T cells were more efficient than PB T cells in inducing CD40 dependent CD23 expression on PB B cells. In addition, CD4+ T cells from synovial membrane clearly expressed CD154. CONCLUSION: Our results establish a link between CD154-CD40 pathway and CD23 expression on PB B cells from patients with RA. T cells from the synovial microenvironment were active participants in this CD23 expression, presumably in the context of cell recirculation.

Combined treatment of giant-cell arteritis with methotrexate and prednisone. a randomized, double-blind, placebo-controlled trial.

BACKGROUND: Corticosteroids remain the cornerstone of therapy for giant-cell arteritis, but relapse during dose tapering and corticosteroid-related adverse events often complicate management of this condition. Although several approaches, including combined therapy with cytotoxic agents, have been suggested to overcome these problems, no study has clearly shown benefits of alternate treatments. OBJECTIVE: To analyze the safety and efficacy of combined therapy with corticosteroids and methotrexate in giant-cell arteritis. DESIGN: Randomized, double-blind, placebo-controlled trial. SETTING: University-based clinic. PATIENTS: 42 patients with new-onset giant-cell arteritis according to biopsy. INTERVENTION: High initial doses of corticosteroid were given; the dose was then tapered quickly until therapy was completely withdrawn. Methotrexate or placebo was given weekly from the start of corticosteroid therapy for 24 months. MEASUREMENTS: Number of relapses, cumulative dose of corticosteroid, and number of adverse events were assessed on completion of follow-up. RESULTS: Compared with combined prednisone and placebo therapy, treatment with prednisone and methotrexate reduced the proportion of patients who experienced at least one relapse (45% vs. 84.2%; P = 0.02) and the proportion of patients who experienced multiple relapses (P = 0.004). The mean cumulative dose of prednisone was 4187 +/- 1529 mg in the methotrexate group and 5489.5 +/- 1396 mg in the placebo group (mean difference, 1302 mg [95% CI, 350 to 2253 mg]; P = 0.009). Overall, the rate and severity of adverse events were similar between groups. Treatment was discontinued in 3 patients in the methotrexate group who experienced definite drug-related adverse events. In sensitivity analysis that included patients lost to follow-up, differences between groups in number of relapses and cumulative dose of prednisone were significant. CONCLUSIONS: Treatment with methotrexate plus corticosteroid is a safe alternative to corticosteroid therapy alone in patients with giant-cell arteritis and is more effective in controlling disease.

Early lymphocyte activation in elderly humans: impaired T and T-dependent B cell responses.

Immunosenescence is characterized by an increase in autoantibody production. Because both T and B cell stimulation are key events for producing antibodies, we investigated early T and B cell activation by means of CD23 and CD40L (two very early activation antigens). PBMC from elderly humans (EH) were studied following culture with either medium, anti-CD3mAb, rIL-4, or PMA + ionomycin. CD23 expression on elderly B cells after anti-CD3 challenge of PBMC, a reflect of T-dependent B cell activation, was clearly defective. Conversely, CD23 expression on EH B cells following activation with soluble factors as rIL-4 was preserved. CD40L expression was also impaired in EH T cells following anti-CD3 challenge. However, activation by means of PMA and/or ionomycin was preserved both in T cells (CD40L expression) and in B cells (CD23 expression). These results indicate that a defective T-dependent B cell activation related to defective T cell activation located between surface membrane and PKC/ionomycin function is an intrinsic characteristic of immunosenescence. We have not found intrinsic B-cell defects, and we conclude that the characteristically impaired early B cell activation in EH is mostly due to T cell defects.

Immunologic and clinical evaluation of postsurgical necrotizing sclerocorneal ulceration.

PURPOSE: To perform a clinical, laboratory and pathologic evaluation in patients who had developed a postsurgical necrotizing sclerocorneal ulceration to detect a serious associated autoimmune disorder and to treat the ocular disease early. METHODS: Nine patients with postsurgical necrotizing sclerocorneal ulceration after uneventful cataract extraction were studied by means of immunohistochemical techniques on conjunctival resections, immunologic serologic studies, and rheumatologic evaluation. Nine healthy subjects who underwent uneventful cataract surgery were used as controls. RESULTS: The pathologic studies showed a local immunoglobulin M (IgM) and IgG deposition, increased human leukocyte antigen (HLA-DR) expression, and a significant T-helper cell participation in conjunctival biopsies in the most severe ulcerations, which were detected in four patients with underlying autoimmune systemic disorder (rheumatoid arthritis, 45%) and only a macrophagic infiltration in the mildest ulcers in patients (55%) without immune disorders. Serologic features included high titers of rheumatoid factor in the four (45%) patients with rheumatoid arthritis, nonspecific serologic immune alteration in three (33%) patients, and were unremarkable in two (22%) patients. The medical and immunologic evaluations were negative in the control cases. Topically administered cyclosporin A healed the ocular disease. CONCLUSION: A surgically induced local autoimmune reaction could occur in the incision area in patients with systemic vasculitic disease. There was no underlying systemic disorder in the mildest ulcers, and these ulcers could be due to a defect in the surgical technique. Our results suggest the need for a detailed systemic evaluation in patients with severe postsurgical necrotizing ulceration. Early diagnosis and aggressive medical treatment of the ocular disorder improves the visual outcome.

Bowel inflammation in anterior uveitis and spondyloarthropathy.

OBJECTIVE: To assess the possible involvement of the bowel in the spectrum of anterior uveitis (AU). METHODS: Ileocolonoscopy and histology studies were performed on 27 patients with AU. RESULTS: Patients with AU had a higher incidence of chronic intestinal inflammation (CII) than controls. CII was present in AU regardless of HLA-B27 status, sacroiliitis or NSAID intake, and was more prevalent in uveitis with high recurrence. CONCLUSION: Bowl inflammation ia a component of the spectrum of AU. This finding supports a HIL-B27 independent common pathogenic link between AU and spondyloarthropathy.