Characterization of angiotensin converting enzyme (ACE) in the testis and assessment of the in vivo effects of the ACE inhibitor perindopril

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Endocrinology; (United States)

OSTI ID:6954446

Jackson, B; Cubela, R B; Sakaguchi, K; Johnston, C I

Angiotensin converting enzyme (ACE) was characterized by radioligand studies utilizing the potent ACE inhibitor 351A, a derivative of lisinopril. Ligand binding characteristics were similar for ACE derived from testis, lung, and kidney, despite known differences in structure between ACe from these sources. This observation suggests that the ACE active enzymatic site is similar in different tissues. The effect of the orally active ACE inhibitor perindopril was studied ex vivo in tissues of the rat after oral gavage. Radioligand bound to tissue ACE was reduced after perindopril treatment, in tissue homogenates of lung and kidney, but not testis. Autoradiographs of radioligand binding to tissue sections obtained ex vivo after oral perindopril showed inhibition of ACE in the aorta, lung, and kidney, but did not reveal any inhibition of ACE in the testis. ACE in small vessels of the testis was inhibited as in the aorta, while at the same time testicular ACE was unaffected. ACE in rat testis appears to have a similar enzymatic binding site to ACE from the lung and kidney. Perindopril inhibited ACE in the lung and kidney but did not affect ACE in the testis, suggesting the drug is limited in testicular penetration by the blood-testis barrier. This may explain the lack of any reports of adverse effects of ACE inhibitors on testicular function.

• Research Organization: Univ. of Melbourne, Victoria (Australia)
• OSTI ID: 6954446
• Journal Information: Endocrinology; (United States), Journal Name: Endocrinology; (United States) Vol. 123:1; ISSN ENDOA
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ANIMALS
AORTA
AROMATICS
ARTERIES
AUTORADIOGRAPHY
AZAARENES
AZOLES
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL EFFECTS
BLOOD VESSELS
BODY
CARDIOVASCULAR SYSTEM
CHEMICAL COMPOSITION
DIGESTIVE SYSTEM
ENZYME INHIBITORS
ENZYMES
GLANDS
GONADS
HETEROCYCLIC COMPOUNDS
HYDROLASES
INDOLES
INHIBITION
KIDNEYS
KINETICS
LIGANDS
LIVER
LUNGS
MALE GENITALS
MAMMALS
MEMBRANE PROTEINS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
PEPTIDE HYDROLASES
PROTEINS
PYRROLES
RATS
REACTION KINETICS
RECEPTORS
RESPIRATORY SYSTEM
RODENTS
TESTES
VERTEBRATES