Comparative histological and immunohistochemical changes of dry type cutaneous leishmaniasis after administration of meglumine antimoniate, imiquimod or combination therapy

This study compared histological and immunohistochemical changes of cutaneous leishmaniasis treated with meglumine antimoniate, imiquimod, and the combination of both therapies. Single blind clinicopathological studies of fifteen patients with old world cutaneous leishmaniasis in Kerman, Iran were included. A total of four patients received a combination of imiquimod [5% cream] and intra-lesional meglumine antimoniate weekly for four weeks. Monotherapy with imiquimod was given to seven patients and four patients were treated with meglumine antimoniate intralesionally. Histological confirmation was performed before and during therapy. Semi-quantitative histological parameters such as numbers of mixed inflammatory cells [cells/mm[2]] and percentages of Langerhans cells [CD1a+], T-cells [CD3+], B-cells [CD20+], and macrophages [CD68+] were calculated immunohistochemically in the dermis and adjacent epidermis. Topical imiquimod significantly reduced mean histiocytic cellular aggregation size [P<0.05]. Meglumine antimoniate reduced parasite load and infected activated histiocytes in the dermis [P<0.05]. Meglumine antimoniate therapy decreased epidermal CD3+ lymphocytes but increased them in the dermis, within the granulomas [P<0.05]. During topical application of imiquimod a depletion of CD1a+ dendritic cells in the epidermis [P<0.05] and slight predominance of dendritic cells in the dermis were observed. Combined therapy and imiquimod monotherapy decreased CD68+ macrophages in the dermis [P<0.05]. Meglumine antimoniate decreases parasite load with considerable effect on up-regulation of T-cells, which demonstrates that meglumine antimoniate works as parasitocidal and immunomodulator, which could be as the first line of treatment. Imiquimod, accentuates the host immune response and reduces granuloma size which could be effective immunomodulator for combination therapy. Monotherapy of imiquimod is less effective than the two other regimens in decreasing parasite load, inflammation and congestion at the inoculated site

An approach to the diagnosis of neutrophilic dermatoses: A histopathological perspective.

Neutrophilic dermatoses comprises of non-infective dermatoses which are histopathologically characterized by neutrophil predominant infiltrate and clinically, respond promptly to corticsteroids. Conditions primarily with vasculitis though neutrophilic are excluded from this group. In this article we intend to briefly outline the approach to diagnose these conditions with histological perspective. The ambiguity regarding few recent dermatosis viz, rheumatoid neutrophilic dermatosis, bowel associated-dermatosis-arthritis syndrome etc. with regard to their inclusion in this group has also been highlighted.