The aim of the current study was to present the spatial distribution of atrial natriuretic peptide (ANP) in short-term cultures of pig granulosa cells obtained from small, medium, and large ovarian follicles. The specific immunoreactivity was detected by three monoclonal antibodies recognizing different epitopes of the ANP molecule (Mab 6C3, Mab 6F11, Mab5D3). The specific ANP immunoreactivity detected by Mab 6C3 and Mab 6F11 showed dense staining of cytoplasm and was similar in granulosa cells from small and medium follicles. The strongest ANP immunostaining was observed in GC obtained from large follicles. The ANP immunostaining detected by Mab 5D3 had granular appearance moderately expressed in the submembrane region of granulosa cells of all types of follicles. Since ANP and ANP receptors are present in reproductive organs, the three anti-ANP antibodies may be an useful tool in further studies concerning the role of ANP in granulosa cell differentiation and function.
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