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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Objectives: Odontogenic cysts and tumors are the most relevant lesions that affect the gnathic bones. These lesions have in common the formation of cystic areas and this common feature may suggest involvement of similar mechanisms. The hypoxia inducible factor 1 alpha (HIFa responsive protein to hypoxia and caspase-3, an irreversible apoptosis marker, may contribute to cyst formation. Thus, this study aimed to investigate the immunoexpression of these proteins in odontogenic cysts and tumors. Material and methods: Twenty cases of ameloblastoma, keratocystic odontogenic tumor (KOT) (n=20), radicular cyst (RC) (n=18), dentigerous cyst (DC) (n=11), calcifying cystic odontogenic tumor (n=8) and dental follicle (DF) (n=10) were used to investigate HIF-and caspase-3 expression in sequential serial cuts by immunohistochemistry. Results: HIF-was overexpressed in RC, DC and ameloblastoma when compared with DF. The basal and sometimes the lower suprabasal layer showed no or very low expression in DC, KOT and ameloblastoma, the last also showing strong expression in solid epithelial areas and initial cystic formation regions. Caspase-3 was found to be overexpressed in all lesions, with the highest expression in odontogenic cysts compared to tumors. HIF-and caspase-3 were localized in similar areas of the same lesions, especially in the epithelium surrounding cystic formations. Conclusions: This study showed distinct immunoexpression of HIF-and caspase-3 in odontogenic cyst and tumors, with higher expression observed in odontogenic cysts. Clinical relevance: These finding suggesting a possible correlation between hypoxia, apoptosis and cystogenesis, leading to understand the mechanisms responsible to cystic formation in odontogenic lesions.

AME showed an increased presence of proteins associated with tumour invasiveness, which indicates a possible role of these proteins in the biological behaviour of this tumour.

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