Spontaneous Re-pigmentation of Vitiligo Following Excision of Halo Congenital Melanocytic nevi: An Interesting Case Report

Summary@#Halo nevi (HN) are benign skin lesion that represent melanocytic nevi in which an inflammatory infiltrate develops, resulting in zone of depigmentation around nevus. Although Sutton originally described the lesion in 1916 as leukoderma acquista centrifugum, the lesions were noted earlier as evidenced in the painting by Matthias Grunwald cica 1512-1516. The prevalence of HNs in the general population is 1%, and HNs usually appear in childhood or early adulthood. Up to 26% of patients with HN have vitiligo, but in very few instances is there an association of HN around congenital melanocytic nevi (CMN) and vitiligo. The exact mechanisms responsible for the development of vitiligo and HN and its resolution are unknown. One of the most accepted hypotheses considers that both phenomena are a result of a self-limited immunologic response to pigmented cells, either in the “normal” skin or within the melanocytic lesion. Hereby we present a rare case report of a girl with halo CMN and infraorbital vitiligo. The halo CMN was excised which was followed by spontaneous improvement of vitiligo.

Antimalarial activity of a novel series of artemisinin-derived 1, 2, 3-triazole dimers

Objective: To obtain suitable artimisinin-based drug candidates with high antimalarial activity. Methods: Three different reaction schemes were used to synthesize a total of 15 artemisinin-based compounds. The first synthetic scheme involved the synthesis of diazido aliphatic and aromatic compounds from commercially available dihalides and azido derivatives of artemisinin. The second scheme consisted of the reaction of dibromoaliphatic compounds with sodium azide in dimethylformamide which yielded the desired compounds. Artemisinin-based compounds on treatment with sodium azide and bromotrimethylsilane in dichloromethane produced the most potent compound GB-2. Another potent compound GB-1 was synthesized from artemisinin by treatment with alcohols in the presence of Aberlyst-15 in anhydrous dichloromethane. The third scheme involved the Huisgen 1,3-dipolar cycloaddition between the synthesized aliphatic and aromatic diazides and two alkyne derivatives of artemisinin to obtain the desired artemisinin dimers with average yields. Results: The best in vitro antiplasmodial activity was shown by the compound GB-2 registering IC