Fine structures of wing scales in Sasakia charonda butterflies as photonic crystals.

We investigate the microstructure of scales in the wings of male Sasakia charonda charonda butterflies by scanning electron microscopy with the aid of optical microscopy. Six types of scales are identified: B1, W1 and R1 in brown background yellow spots and red spots, respectively; B2 in iridescent purple-blue and W2 in white pearl, both of which characterize the male and B3 in the wing edges. The B1, W1 and R1 scales are almost the same in structure and the B2 and W2 scales are almost the same. The difference among the B, W and R scales is in species and content of pigment. The B1, W1 and R1 scales have only two layers of cuticle lapped on the ridges. In contrast with them, the B2 and W2 scales have seven multilayers of cuticle piled on the ridge. The multiple interference of light that occurs among these cuticle layers, spaced with air layers, generates the significant iridescence of the B2 and W2 scales. Thus, the characteristic purple-blue of the male wings is ascribed to the combination of the structural and chemical colouration in the B2 scales with melanin. The photonic crystals of these scales may be applicable to fine light manipulators such as reflection elements in laser diodes. B3 has many holes between the ridges and no multilayers of cuticle on the ridges. These structures may play any role in aerodynamically easy flight and/or in drainage of wet wings.

[TINU syndrome]. / TINU syndrom.

PURPOSE: To evaluate our experience with the diagnosis and the treatment of the TINU syndrome. The term TINU syndrome means the intraocular inflammation occurring in association with tubulointerstitial nephritis. The predominance of younger females was established. The uveitis is frequently chronic, moderate, and bilateral. The treatment with immunosuppressive drugs often has positive clinical response. METHODS: A retrospective study. RESULTS: Five patients, 4 women and 1 man, have been examined and treated for the TINU syndrome in our Department for Diagnosis and Treatment of Uveitis. The age ranged from 8 to 62 years. The treatment with immunosuppressive drugs caused reduction of the inflammatory reaction and visual acuity improvement. CONCLUSION: Immunosuppressive drugs were effective in all of our patients suffering from the TINU syndrome. The cooperation between ophthalmologist and nephrologist is crucial for the effective control of the disease activity and for drug regimen optimization.

[Sympathetic ophthalmia]. / Sympatická oftalmie.

PURPOSE: To evaluate the efficacy of treatment on prevention of disease development and protection of visual outcomes in patients suffering from sympathetic ophthalmia. METHODS: Retrospective case. RESULTS: Four patients with sympathetic ophthalmia were treated in our department from 1999 to 2004. All patients were men with the mean age 27.5 years (15-49 years). In two patients, there was a history of penetrating eye injury prior to the onset of sympathetic ophthalmia, in other two patients sympathetic ophthalmia occurred after eye surgery (pars plana vitrectomy), with no previous ocular trauma. Two patients were treated with monotherapy of corticosteroids; other two patients were commenced on combined immunosuppression. In all these cases, the therapy was effective. CONCLUSION: Sympathetic ophthalmia is a rare, sight-threatening eye disease. Among the triggering factors dominates penetrating eye injury, however, there is currently an increase in the number of cases with sympathetic ophthalmia following eye surgery, mainly pars plana vitrectomy. Early introduction of immunosuppressive treatment can get the disease under control, prevent the development of intraocular inflammation and improve visual outcomes.

[TNFalpha inhibitors in the treatment of uveitis]. / TNFalpha-Inhibitoren in der Uveitistherapie.

Tumor necrosis factor alpha (TNFalpha) is a pleiotropic cytokine that plays a pivotal role in chronic inflammatory diseases. Data from animal experiments indicate that TNFalpha is an important part of the pro-inflammatory processes in non-infectious uveitis. Neutralization of TNFalpha with TNF receptor fusion proteins or monoclonal antibodies, therefore, represents a promising strategy for the treatment of uveitis. In addition, the currently available TNFalpha inhibitors demonstrate a favourable profile of side effects compared to conventional immunosuppressive agents. Previous studies showed the immunological efficacy of TNFalpha inhibitors in the treatment of posterior uveitis. However, the available data on anterior uveitis are inconclusive with respect to the clinical efficacy of these agents.

Quantitative evaluation of the corneal endothelium in the mouse after grafting.

BACKGROUND/AIM: Corneal graft survival depends critically on the quality of the endothelium. In this study the authors aimed to evaluate corneal endothelium in mice at different times after transplantation and to correlate endothelial integrity with corneal graft survival. METHODS: Syngeneic and allogeneic corneal grafts at various times (days 0-60) after engraftment were examined in flat mount preparation by confocal microscopy, by evaluating the hexagonal pattern of the endothelial monolayer using actin staining of the cell cortex. Corneas from untreated mice and from mice, who were grafted after removal of draining lymph nodes served as controls. RESULTS: In control corneas, more than 90% of the posterior surface was covered by endothelium. Syngeneic grafts were always covered by 54-99% of endothelium. In contrast, the posterior surface of corneal allografts showed great variation in the degree of endothelial cell coverage (0-98%). In addition, clinical opacity grading measure was not a reliable predictor of endothelial coverage. CONCLUSION: In corneal allografts there is progressive loss of endothelium over time, unlike with syngeneic grafts. However, in the early stages of allograft rejection, the grade of graft opacity does not accurately reflect the degree of endothelial cell coverage. Although corneal opacity grade is considered the main determinant of graft rejection, the data suggest that both the grade of corneal opacity plus a sufficient post-graft time duration (>8 weeks in the mouse) are required for the diagnosis of irreversible graft rejection.

FK 506 and aminoguanidine suppress iNOS induction in orthotopic corneal allografts and prolong graft survival in mice.

The aim of this study was to compare the effectiveness of immunosuppressant FK 506 and the specific inhibitor of inducible nitric oxide synthase (iNOS) aminoguanidine (AG) in prevention of corneal graft rejection and to investigate the iNOS expression in the rejection process. Orthotopic corneal allografting in mice was performed (C57BL/10; H-2(b) to BALB/c; H-2(d)). FK 506 (0.3 mg/kg per day) or AG (100 mg/kg per day) was injected intraperitoneally for 4 weeks. Grafted mice without therapy served as controls. Immunohistological evaluation of iNOS-positive cells and macrophage infiltration in grafts 27th day after grafting was performed. Within 4 weeks FK 506 prevented graft rejection in 71% and AG in 57% of animals compared to 29% of clear grafts in controls. A significant proportion of iNOS-positive cells was detected in the rejected grafts of the control and AG-treated groups. The treatment with FK 506 resulted in the inhibition of iNOS expression to a high degree in the rejected corneas. Non-rejected corneas of all groups and non-transplanted corneas exhibited no iNOS-positive cells. A massive infiltration of macrophages was detected in the rejected grafts, whereas non-rejected grafts exhibited only slight infiltration of macrophages. The presented data suggest that overexpression of iNOS and/or activation of iNOS is one of the several influential factors that contribute to the rejection process and that iNOS suppression delays corneal allograft rejection. FK 506 and AG are effective drugs in preventing corneal allograft rejection. Higher beneficial effect of FK 506 on graft survival could be explained by its well-known selective T-cell immunosuppression.

Evaluation of corneal graft rejection in a mouse model.

Corneal graft rejection presents clinically and in experimental models as opacification and is considered to be the result of endothelial cell dysfunction or loss. However, recovery from opacification can occur suggesting either (a) that new endothelial cells can regenerate if the original cells were lost, or (b) that sufficient numbers of original cells can regain function if the opacification was due to temporary dysfunction. In this perspective, previous experimental studies of allograft rejection plus some new data are reviewed to support the latter mechanism.

Induction of specific transplantation immunity by oral immunization with allogeneic cells.

Oral administration of antigen has been shown to be effective for both positive and negative modulation of immune responses. In the present study we characterized changes in the reactivity of the immune system after oral immunization with allogeneic spleen cells. Mice were orally immunized for 10 consecutive days with fresh allogeneic spleen cells, and the phenotype, proliferative response, cytotoxic activity and cytokine production profile of recipient spleen cells were assessed 1 or 7 days after the last immunization dose. Although no significant changes in the proportion of CD4+, CD8+ or CD25+ cells were observed in the spleen of orally immunized mice, significant activation of alloreactivity in spleen cells was found. Cells from orally immunized mice exhibited enhanced proliferation and cytotoxic activity after stimulation with specific allogeneic cells in vitro, and produced considerably higher concentrations of interferon-gamma (IFN-gamma) and significantly less interleukin (IL)-4 than did cells from control mice. The production of IL-2 was essentially unchanged and that of IL-10 was only slightly increased. The systemic allosensitization induced by oral immunization was demonstrated in vivo by increased resistance to the growth of allogeneic tumours induced by subcutaneous inoculation of high doses of tumour cells. In addition, orthotopic corneal allografts in orally immunized recipients were rejected more rapidly (in a second-set manner) than in control, untreated recipients. These data show that oral immunization with allogeneic cells modulates individual components of the immune response and that specific transplantation immunity, rather than tolerance, is induced in the treated recipients.