RT Journal Article
T1 In vitro inhibition of phosphodiesterase type 4 enhances rat corpus cavernosum nerve-mediated relaxation induced by gasotransmitters
A1 Leite Fernandes, Vitor Samuel
A1 López-Oliva Muñoz, María Elvira
A1 Martínez Sainz, María Del Pilar
A1 Agis Torres, Ángel
A1 Recio Visedo, María Paz
A1 Navarro Dorado, Jorge
A1 Barahona Gomáriz, María Victoria
A1 Benedito Castellote, Sara
A1 Prieto Ocejo, Dolores
A1 Climent Flórez, Belén
A1 Hernández Rodríguez, Medardo Vicente
AB Aims: Nitric oxide (NO) and hydrogen sulfide (H2S) are involved in nerve-mediated corpus cavernosum (CC) relaxation. Expression of phosphodiesterase type 5 (PDE5) and type 4 (PDE4), cyclic guanosine monophosphate (cGMP)- and cyclic adenosine monophosphate (cAMP)-specific, respectively, has been described and PDE5- and PDE4-inhibitors induce cavernous smooth muscle relaxation. Whereas the NO/cGMP signaling pathway is well established in penile erection, the cAMP-mediated mechanism is not fully elucidated. The aim of this study is to investigate the localization and the functional significance of PDE4 in rat CC tone regulation.Main methods: We performed immunohistochemistry for the detection of the PDE4A isoenzyme. Isometric tension recordings for roflumilast and tadalafil, PDE4 and PDE5 inhibitors, respectively, electrical field stimulation (EFS) and β-adrenoceptor agonist isoproterenol and endogenous H2S production measurement.Key findings: A marked PDE4A expression was detected mainly localized in the nerve cells of the cavernous smooth muscle. Furthermore, roflumilast and tadalafil exhibited strong corpus cavernous relaxations. Endoge-nous H2S production was decreased by NO and H2S synthase inhibitors and increased by roflumilast. Isopro-terenol- and EFS-induced relaxations were increased by roflumilast.Significance: These results indicate that PDE4A is mainly expressed within the nerves cells of the rat CC, where roflumilast induces a potent corpus cavernous relaxation per se and potentiates the response induced by β-adrenoceptor activation. The fact that roflumilast enhances H2S production, as well as EFS-elicited responses suggests that PDE4 inhibitors modulate, in a positive feedback fashion, nerve-mediated relaxation induced by gasotransmitters, thus indicating a key role for neuronal PDE4 in penile erection.
PB Elsevier
SN 00243205
YR 2022
FD 2022-02-25
LK https://hdl.handle.net/20.500.14352/71526
UL https://hdl.handle.net/20.500.14352/71526
LA eng
NO Fernandes VS, López-Oliva ME, Martínez MP, Agis-Torres Á, Recio P, Navarro-Dorado J, et al. In vitro inhibition of phosphodiesterase type 4 enhances rat corpus cavernosum nerve-mediated relaxation induced by gasotransmitters. Life Sciences 2022;296:120432. https://doi.org/10.1016/j.lfs.2022.120432.
NO CRUE-CSIC (Acuerdos Transformativos 2022)
NO Universidad Complutense de Madrid (Santander-UCM)
DS Docta Complutense
RD 2 may 2024