1
|
Smith SJ, Lopresti AL, Fairchild TJ. The effects of alcohol on testosterone synthesis in men: a review. Expert Rev Endocrinol Metab 2023; 18:155-166. [PMID: 36880700 DOI: 10.1080/17446651.2023.2184797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 02/22/2023] [Indexed: 03/02/2023]
Abstract
INTRODUCTION Testosterone concentrations in men decline with advancing age, with low testosterone concentrations being associated with multiple morbidities, an increased risk of early mortality, and a reduced quality of life. The purpose of this study was to examine the effects of alcohol on testosterone synthesis in men by investigating its effects on each level of the hypothalamic-pituitary-gonadal axis. AREAS COVERED Acute consumption of a low-to-moderate amount of alcohol increases testosterone concentrations in men, while consumption of a large volume of alcohol is associated with a reduction in serum testosterone concentrations. Elevated testosterone concentrations result from the increased activity of detoxification enzymes in the liver. Conversely, the primary mechanisms of action involved in the reduction of testosterone are increased hypothalamic-pituitary-adrenal axis activity, inflammation, and oxidative stress. When alcohol is consumed in excess, particularly chronically, it negatively affects testosterone production in men. EXPERT OPINION Since testosterone is an important component of men's health and wellbeing, current levels of alcohol consumption in many countries of the world require urgent attention. Elucidating the relationship between alcohol consumption and testosterone may be useful in identifying strategies to attenuate the testosterone-reducing effects of excessive or chronic alcohol consumption.
Collapse
Affiliation(s)
- Stephen James Smith
- Clinical Research Australia, Perth, Australia
- The Centre for Molecular Medicine and Innovative Therapeutics, Murdoch University, Perth, Australia
| | - Adrian Leo Lopresti
- Clinical Research Australia, Perth, Australia
- The Centre for Molecular Medicine and Innovative Therapeutics, Murdoch University, Perth, Australia
| | - Timothy John Fairchild
- The Centre for Molecular Medicine and Innovative Therapeutics, Murdoch University, Perth, Australia
| |
Collapse
|
2
|
Szentkereszty-Kovács Z, Gáspár K, Szegedi A, Kemény L, Kovács D, Törőcsik D. Alcohol in Psoriasis-From Bench to Bedside. Int J Mol Sci 2021; 22:ijms22094987. [PMID: 34067223 PMCID: PMC8125812 DOI: 10.3390/ijms22094987] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/02/2021] [Accepted: 05/03/2021] [Indexed: 01/22/2023] Open
Abstract
Alcohol affects the symptoms, compliance and comorbidities as well as the safety and efficacy of treatments in psoriatic patients. In this review, we aim to summarize and link clinical observations with a molecular background, such as signaling pathways at the cellular level and genetic variations, and to provide an overview of how this knowledge could influence our treatment selection and patient management.
Collapse
Affiliation(s)
- Zita Szentkereszty-Kovács
- Department of Dermatology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary; (Z.S.-K.); (K.G.); (A.S.); (D.K.)
| | - Krisztián Gáspár
- Department of Dermatology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary; (Z.S.-K.); (K.G.); (A.S.); (D.K.)
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Andrea Szegedi
- Department of Dermatology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary; (Z.S.-K.); (K.G.); (A.S.); (D.K.)
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary
| | - Lajos Kemény
- HCEMM-USZ Skin Research Group, Department of Dermatology and Allergology, University of Szeged, Korányi fasor 6, 6720 Szeged, Hungary;
- MTA-SZTE Dermatological Research Group, Eötvös Loránd Research Network (ELKH), Korányi fasor 6, 6720 Szeged, Hungary
| | - Dóra Kovács
- Department of Dermatology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary; (Z.S.-K.); (K.G.); (A.S.); (D.K.)
| | - Dániel Törőcsik
- Department of Dermatology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, 4032 Debrecen, Hungary; (Z.S.-K.); (K.G.); (A.S.); (D.K.)
- Correspondence: ; Tel.: +36-52-255-602
| |
Collapse
|
3
|
Nimitvilai S, Arora DS, McElvain MA, Brodie MS. Ethanol blocks the reversal of prolonged dopamine inhibition of dopaminergic neurons of the ventral tegmental area. Alcohol Clin Exp Res 2012; 36:1913-21. [PMID: 22551160 PMCID: PMC3652026 DOI: 10.1111/j.1530-0277.2012.01814.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Accepted: 02/20/2012] [Indexed: 01/07/2023]
Abstract
Background Dopaminergic (DAergic) neurons of the ventral tegmental area (VTA) are important for the rewarding and reinforcing properties of alcohol and other drugs of abuse. Regulation of the firing of DAergic VTA neurons is controlled by a number of factors, including autoregulation of firing by D2 dopamine (DA) receptors. The inhibitory effects of DA on these neurons exhibit concentration- and time-dependent desensitization, which we have termed dopamine inhibition reversal (DIR), as it requires concurrent stimulation of D1/D5 and D2 receptors. Methods Extracellular recording of DAergic VTA neurons in brain slices was used to test the effects of ethanol (EtOH) (10 to 80 mM) on DIR. Results DIR was reduced by concentrations of EtOH as low as 10 mM and was blocked by higher EtOH concentrations. In addition, as we have shown that reversal of inhibition by the selective D2 agonist quinpirole can be observed in the presence of an activator of protein kinase C (PKC), we tested whether EtOH could antagonize the reversal of quinpirole inhibition in the presence of phorbol 12-myristate 13-acetate (PMA). EtOH (80 mM) blocked the reversal of quinpirole seen in the presence of PMA, suggesting that the antagonism of DIR by EtOH is owing to an action at a stage in the mechanism at or distal to PKC. Once achieved, DIR is not antagonized by EtOH. Conclusions The blockade by relatively low concentrations of EtOH of DIR may play an important role in the spectrum of action of EtOH on DAergic neurons of the VTA and may be important in the acute and chronic actions of EtOH on the excitability of these brain reward/reinforcement neurons.
Collapse
Affiliation(s)
- Sudarat Nimitvilai
- Department of Physiology and Biophysics, University of Illinois at Chicago, IL 60612, USA
| | | | | | | |
Collapse
|
4
|
Rettori V, De Laurentiis A, Fernandez-Solari J. Alcohol and endocannabinoids: Neuroendocrine interactions in the reproductive axis. Exp Neurol 2010; 224:15-22. [DOI: 10.1016/j.expneurol.2010.03.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Accepted: 03/25/2010] [Indexed: 12/30/2022]
|
5
|
Kumar S, Lane BM, Morrow AL. Differential effects of systemic ethanol administration on protein kinase cepsilon, gamma, and beta isoform expression, membrane translocation, and target phosphorylation: reversal by chronic ethanol exposure. J Pharmacol Exp Ther 2006; 319:1366-75. [PMID: 16997974 DOI: 10.1124/jpet.106.110890] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Systemic ethanol administration alters protein kinase C (PKC) activity in brain, but the effects of ethanol on the expression and translocation of specific isoforms are unknown. Rats were administered ethanol (2 g/kg i.p.) or saline and PKC levels were measured in the cytosolic and membrane fractions by Western blot analysis. PKCepsilon expression was increased in the cytosol and decreased in the membrane (P2) fraction of cerebral cortex at 10 min. At 60 min, expression of PKCepsilon in the P2 fraction was increased by 42.2 +/- 12%, but cytosolic levels were unchanged. In contrast, PKCgamma in the P2 fraction was decreased 32.7 +/- 7% at 60 min but not at 10 min post-ethanol administration. PKCgamma levels in the cytosol were reduced at 10 min post-ethanol administration and unchanged at 60 min. PKCbeta expression was increased 36 +/- 10 and 144 +/- 52% in the P2 fraction both at 10 and 60 min post-ethanol administration, whereas cytosolic levels were unchanged. Serine phosphorylation of GABA(A) receptor beta-chain was reduced, and phosphorylation of N-methyl-d-aspartate receptor NR1 subunit was increased 60 min following ethanol administration. There was no effect of acute ethanol administration on PKC isoform levels in the hippocampus. Ethanol challenge did not alter PKC isoform expression in the P2 fraction of cerebral cortex following chronic ethanol administration. These findings suggest that acute ethanol administration alters PKC synthesis and translocation in an isoform and brain region specific manner that leads to alterations in serine phosphorylation of receptors. Furthermore, chronic ethanol administration prevents ethanol-induced alterations in PKC expression in the P2 fraction, where PKC interacts with ethanol-responsive ion channels.
Collapse
Affiliation(s)
- S Kumar
- Department of Psychiatry, Bowles Center for Alcohol Studies, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7178, USA
| | | | | |
Collapse
|
6
|
Ron D, Vagts AJ, Dohrman DP, Yaka R, Jiang Z, Yao L, Crabbe J, Grisel JE, Diamond I. Uncoupling of betaIIPKC from its targeting protein RACK1 in response to ethanol in cultured cells and mouse brain. FASEB J 2000; 14:2303-14. [PMID: 11053252 DOI: 10.1096/fj.00-0143com] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Protein kinase C (PKC) is involved in many neuroadaptive responses to ethanol in the nervous system. PKC activation results in translocation of the enzyme from one intracellular site to another. Compartmentalization of PKC isozymes is regulated by targeting proteins such as receptors for activated C kinase (RACKs). It is possible, therefore, that ethanol-induced changes in the function and compartmentalization of PKC isozymes could be due to changes in PKC targeting proteins. Here we study the response of the targeting protein RACK1 and its corresponding kinase betaIIPKC to ethanol, and propose a novel mechanism to explain how ethanol modulates signaling cascades. In cultured cells, ethanol induces movement of RACK1 to the nucleus without affecting the compartmentalization of betaIIPKC. Ethanol also inhibits betaIIPKC translocation in response to activation. These results suggest that ethanol inhibition of betaIIPKC translocation is due to miscompartmentalization of the targeting protein RACK1. Similar events occurred in mouse brain. In vivo exposure to ethanol caused RACK1 to localize to nuclei in specific brain regions, but did not affect the compartmentalization of betaIIPKC. Thus, some of the cellular and neuroadaptive responses to ethanol may be related to ethanol-induced movement of RACK1 to the nucleus, thereby preventing the translocation and corresponding function of betaIIPKC.
Collapse
Affiliation(s)
- D Ron
- Ernest Gallo Research Center, Department of Neurology, San Francisco, CA 94110-3518, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
7
|
de la Monte SM, Ganju N, Banerjee K, Brown NV, Luong T, Wands JR. Partial rescue of ethanol-induced neuronal apoptosis by growth factor activation of phosphoinositol-3-kinase. Alcohol Clin Exp Res 2000. [PMID: 10832914 DOI: 10.1111/j.1530-0277.2000.tb02044.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Ethanol inhibition of insulin signaling pathways may contribute to impaired central nervous system (CNS) development in the fetal alcohol syndrome and brain atrophy associated with alcoholic neurodegeneration. Previous studies demonstrated ethanol inhibition of insulin-stimulated growth in PNET2 CNS-derived proliferative (immature) neuronal cells. We now provide evidence that the growth-inhibitory effect of ethanol in insulin-stimulated PNET2 cells is partly due to apoptosis. METHODS Control and ethanol-treated PNET2 cells were stimulated with insulin and analyzed for viability, apoptosis, activation of pro-apoptosis and survival gene expression and signaling pathways, and evidence of caspase activation. RESULTS Ethanol-treated PNET2 neuronal cells exhibited increased apoptosis mediated by increased levels of p53 and phospho-amino-terminal c-jun kinase (phospho-JNK), and reduced levels of Bcl-2, phosphoinositol 3-kinase (PI3 K), and intact (approximately 116 kD) poly (ADP ribose) polymerase (PARP), a deoxyribonucleic acid repair enzyme and important substrate for caspase 3. Partial rescue from ethanol-induced neuronal cell death was effected by culturing the cells in medium that contained 2% fetal calf serum instead of insulin, or insulin plus either insulin-like growth factor type 1 or nerve growth factor. The resulting enhanced viability was associated with reduced levels of p53 and phospho-JNK and increased levels of PI3 K and intact PARP. CONCLUSIONS The findings suggest that ethanol-induced apoptosis of insulin-stimulated neuronal cells can be reduced by activating PI3 K and inhibiting pro-apoptosis gene expression and intracellular signaling through non-insulin-dependent pathways.
Collapse
Affiliation(s)
- S M de la Monte
- MGH East Cancer Center and Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, USA.
| | | | | | | | | | | |
Collapse
|
8
|
Oonishi T, Sakashita K. Ethanol Improves Decreased Filterability of Human Red Blood Cells Through Modulation of Intracellular Signaling Pathways. Alcohol Clin Exp Res 2000. [DOI: 10.1111/j.1530-0277.2000.tb04621.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
9
|
|
10
|
|
11
|
Affiliation(s)
- R Wolf
- Department of Dermatology, Tel-Aviv Sourasky Medical Center, Ichilov Hospital, Israel
| | | | | |
Collapse
|
12
|
Bowers BJ, Owen EH, Collins AC, Abeliovich A, Tonegawa S, Wehner JM. Decreased Ethanol Sensitivity and Tolerance Development in gamma-Protein Kinase C Null Mutant Mice Is Dependent on Genetic Background. Alcohol Clin Exp Res 1999. [DOI: 10.1111/j.1530-0277.1999.tb04127.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
13
|
Greenberg SS, Jie O, Zhao X, Wang JF. Role of PKC and tyrosine kinase in ethanol-mediated inhibition of LPS-inducible nitric oxide synthase. Alcohol 1998; 16:167-75. [PMID: 9665319 DOI: 10.1016/s0741-8329(97)00187-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ethanol increases human and animal susceptibility to opportunistic lung infections in part by suppression of endotoxin (LPS) and bacteria-mediated upregulation of inducible nitric oxide synthase (iNOS) in alveolar macrophages (AM). LPS and cytokine-induced NOS mRNA are dependent on NF-kappaB/Rel (NFkappaB) and Activator Protein-1 (AP-1), which are regulated in turn by protein kinase C and tyrosine kinase-dependent phosphorylation. ETOH does not directly inhibit NFkappaB or AP-1, in vivo, but rather inhibits LPS-induced activation of the MEKK/MAP kinase system and inhibition of inhibitory protein IkappaBalpha required for formation of AP-1 and NFkappaB, respectively. in AM. Both transcription factors are involved iNOS mRNA transcription. LPS-induced upregulation of MEKK/MAP tyrosine kinase upregulates NADPH oxidase activity and oxygen free radical formation required for activation of NFkappaB and AP-1 and phosphorylation of IkappaBalpha. LPS downregulates endogenous calcium-sensitive PKC isozymes (PKCdelta), which repress iNOS mRNA expression. ETOH inhibits LPS-induced upregulation of iNOS mRNA by preventing its ability to decrease PKCdelta and upregulate tyrosine kinase-mediated phosphorylation. This effect of ETOH is prevented by inhibitors of PKC and tyrosine kinase. The data support the hypothesis that ETOH inhibits LPS-induced upregulation of iNOS mRNA by interfering with the phosphorylation processes involved in activation of the nuclear transcription factors NFkappaB and AP-1.
Collapse
Affiliation(s)
- S S Greenberg
- Alcohol Research Center, Department of Medicine, Louisiana State University Medical Center, New Orleans 70112, USA
| | | | | | | |
Collapse
|