Page 54 - AAOMP Meeting 2019

POSTER ABSTRACTS - TUESDAY, JUNE 11, 2019

#59 ORAL LESIONS IN MUCOCUTANEOUS LEISHMANIASIS
Dr. Adoniran Dambroski (Faculdade São Leopoldo Mandic), Dr. Andresa Soares (Faculdade São
Leopoldo Mandic), Dr. Fabrício Passador-Santos (Faculdade São Leopoldo Mandic), Dr. Lucas
Teixeira (Faculdade São Leopoldo Mandic), Dr. Marcelo Sperandio (Faculdade São Leopoldo
Mandic), Dr. Eduardo Cruz (Faculdade São Leopoldo Mandic), Dr. Ana Rosa (Lutheran University
of Palmas)
Mucocutaneous leishmaniasis is an infectious disease transmitted by protozoa of the genus Leishmania, which
causes ulcers in the skin and mucous membranes of the upper airways. The aim of this study is to report on 2
cases of oral mucocutaneous leishmaniasis. The first case is from a healthy 17-year-old caucasian male,
presenting with a 4-month history of an ulcerative erythematous lesion in the lower lip, which was bleeding,
swollen and painful at presentation. The differential diagnoses were carcinoma or infectious disease. The
second case was a 35-year-old male, who was HIV+, smoker, presenting with an erythematous ulcerative
lesion in the gingival mucosa of the lower right anterior alveolar ridge, similar to moriform stomatitis, with
intense burning symptoms. The diagnostic hypothesis was paracoccidioidomycosis. In both cases, an incisional
biopsy was taken. Histopathological evaluation revealed macrophages containing particles resembling
amastigote forms of Leishmania in the conective tissue of the oral mucosa. The patients were refered for
treatment and subsequent tests confirmed the diagnosis of leshmaniasis. The cases reported herein presents two
cases of mucocutaneous leishmaniasis manifesting solely in the oral cavity, thus highlighting difficulties with
diagnosis.

#60 THERAPEUTIC EVALUATION OF A NOVEL TOPICAL ANTIMICROBIAL
FORMULATION AGAINST CANDIDA-ASSOCIATED DENTURE STOMATITIS IN AN
EXPERIMENTAL RAT MODEL
Dr. Ahmed Sultan (University of Maryland Baltimore), Dr. Taissa Vila (University of Maryland
Baltimore), Ms. Alexandra Rizk (University of Maryland Baltimore), Dr. Radi Masri (university of mary),
Dr. Mary Ann Jabra-Rizk (University of Maryland Baltimore)
Introduction: Oral candidiasis caused by the fungal opportunistic pathogen Candida albicans is a
common pathological condition affecting oral mucosal surfaces. Candida-associated denture stomatitis (DS)
specifically, is the most prevalent manifestation which tends to be recurrent and refractory to antifungal
therapy due to the ability of C. albicans to adhere to dentures and form persistent biofilms. However, there
are currently no effective therapeutic strategies for the prevention of this recurrent condition. Antimicrobial
peptides have attracted significant attention as alternative therapeutics due to their lack of toxicity and potent
antimicrobial and anti-inflammatory properties. Specifically, Histatin-5 (Hst-5) has demonstrated potent
activity against C. albicansincluding strains resistant to traditional antifungals. However, since we
previously identified potential vulnerability for Hst-5 to proteolysis by C. albicans proteases, we engineered
a variant with double amino-acid mutations (K11R-K17R) which proved to be highly resistant to
proteolysis. Materials and Methods: A bioadhesive polymer-based hydrogel was designed as a peptide
delivery system in order to develop a therapeutic topical formulation for prevention of DS. To evaluate in
vivo efficacy, state-of-the-art 3D digital imaging and printing technology was utilized to design and fabricate
an acrylic intraoral device for rats. Results: Evaluation of the novel animal model demonstrated its
suitability for developing DS mimicking the clinical manifestations in humans. Importantly, the 3D-printed
device was specifically digitally designed for precise universal fit on all rat palates. Based on clinical,
microbiological and histopathologic analysis of infected animals receiving oral treatment, our findings
established the efficacy of the formulation in inhibiting C. albicans adherence and biofilm formation on
denture acrylic, and importantly, in protecting the associated palatal tissue against infection. Further, we
showed that the formulation lacks toxicity to mammalian cells. Conclusion: Collectively, these findings
establish the clinical utility of the newly developed antimicrobial bioadhesive oral topical formulation for
the prevention of DS development.