Cyclic GMP signaling in rat urinary bladder, prostate, and epididymis: tissue-specific changes with aging and in response to Leydig cell depletion.
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Cyclic GMP signaling in rat urinary bladder, prostate, and epididymis: tissue-specific changes with aging and in response to Leydig cell depletion. / Müller, Dieter; Mukhopadhyay, Amal K; Davidoff, Michail; Middendorff, Ralf.
in: REPRODUCTION, Jahrgang 142, Nr. 2, 2, 2011, S. 333-343.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Cyclic GMP signaling in rat urinary bladder, prostate, and epididymis: tissue-specific changes with aging and in response to Leydig cell depletion.
AU - Müller, Dieter
AU - Mukhopadhyay, Amal K
AU - Davidoff, Michail
AU - Middendorff, Ralf
PY - 2011
Y1 - 2011
N2 - Aging of the male reproductive system leads to changes in endocrine signaling and is frequently associated with the emergence of prostate hyperplasia and bladder dysfunctions. Recent reports highlight prostate and bladder as promising targets for therapeutic interventions with inhibitors of the cyclic GMP (cGMP)-degrading phosphodiesterase 5 (PDE5). However, the cGMP signaling system in these organs is as yet poorly characterized, and the possibility of age-related alterations has not been addressed. This study investigates key proteins of cGMP pathways in bladder, prostate, and epididymis of young (3 months) and old (23-24 months) Wistar rats. Local differences in the abundance of PDE5, soluble guanylyl cyclase (sGC) and particulate guanylyl cyclases (GC-A, GC-B), endothelial nitric oxide synthase, and cGMP-dependent protein kinase I (PRKG1 (cGKI)) revealed pronounced tissue-specific peculiarities. Although cGMP-generating enzymes were not affected by age in all organs, we recognized age-related decreases of PDE5 expression in bladder and a selective diminishment of membrane-associated PRKG1 in epididymis. In disagreement with published data, all cGMP pathway proteins including PDE5 are poorly expressed in prostate. However, prostatic PRKG1 expression increases with aging. Androgen withdrawal during temporary Leydig cell elimination induced a massive (>12-fold) upregulation of PRKG1 in prostate but not in other (penis and epididymis) androgen-dependent organs. These findings identify PRKG1 as a key androgen-sensitive signaling protein in prostate of possible importance for growth regulation. The elucidated effects may have significance for age-associated pathologies in the male lower-urinary tract.
AB - Aging of the male reproductive system leads to changes in endocrine signaling and is frequently associated with the emergence of prostate hyperplasia and bladder dysfunctions. Recent reports highlight prostate and bladder as promising targets for therapeutic interventions with inhibitors of the cyclic GMP (cGMP)-degrading phosphodiesterase 5 (PDE5). However, the cGMP signaling system in these organs is as yet poorly characterized, and the possibility of age-related alterations has not been addressed. This study investigates key proteins of cGMP pathways in bladder, prostate, and epididymis of young (3 months) and old (23-24 months) Wistar rats. Local differences in the abundance of PDE5, soluble guanylyl cyclase (sGC) and particulate guanylyl cyclases (GC-A, GC-B), endothelial nitric oxide synthase, and cGMP-dependent protein kinase I (PRKG1 (cGKI)) revealed pronounced tissue-specific peculiarities. Although cGMP-generating enzymes were not affected by age in all organs, we recognized age-related decreases of PDE5 expression in bladder and a selective diminishment of membrane-associated PRKG1 in epididymis. In disagreement with published data, all cGMP pathway proteins including PDE5 are poorly expressed in prostate. However, prostatic PRKG1 expression increases with aging. Androgen withdrawal during temporary Leydig cell elimination induced a massive (>12-fold) upregulation of PRKG1 in prostate but not in other (penis and epididymis) androgen-dependent organs. These findings identify PRKG1 as a key androgen-sensitive signaling protein in prostate of possible importance for growth regulation. The elucidated effects may have significance for age-associated pathologies in the male lower-urinary tract.
KW - Animals
KW - Male
KW - Up-Regulation
KW - Rats
KW - Rats, Wistar
KW - Organ Specificity
KW - Down-Regulation
KW - Aging/metabolism
KW - Cyclic GMP-Dependent Protein Kinases/metabolism
KW - Androgens/metabolism
KW - Cyclic GMP/physiology
KW - Cyclic Nucleotide Phosphodiesterases, Type 5/metabolism
KW - Cytosol/metabolism
KW - Epididymis/drug effects/metabolism
KW - Leydig Cells/drug effects/physiology
KW - Mesylates/toxicity
KW - Prostate/drug effects/metabolism
KW - Second Messenger Systems/drug effects
KW - Spermatogenesis/drug effects
KW - Urinary Bladder/drug effects/metabolism
KW - Animals
KW - Male
KW - Up-Regulation
KW - Rats
KW - Rats, Wistar
KW - Organ Specificity
KW - Down-Regulation
KW - Aging/metabolism
KW - Cyclic GMP-Dependent Protein Kinases/metabolism
KW - Androgens/metabolism
KW - Cyclic GMP/physiology
KW - Cyclic Nucleotide Phosphodiesterases, Type 5/metabolism
KW - Cytosol/metabolism
KW - Epididymis/drug effects/metabolism
KW - Leydig Cells/drug effects/physiology
KW - Mesylates/toxicity
KW - Prostate/drug effects/metabolism
KW - Second Messenger Systems/drug effects
KW - Spermatogenesis/drug effects
KW - Urinary Bladder/drug effects/metabolism
M3 - SCORING: Journal article
VL - 142
SP - 333
EP - 343
JO - REPRODUCTION
JF - REPRODUCTION
SN - 1470-1626
IS - 2
M1 - 2
ER -
