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Reglodi D, Illes A, Opper B, Schafer E, Tamas A, Horvath G. Presence and Effects of Pituitary Adenylate Cyclase Activating Polypeptide Under Physiological and Pathological Conditions in the Stomach. Front Endocrinol (Lausanne) 2018; 9:90. [PMID: 29615974 PMCID: PMC5868562 DOI: 10.3389/fendo.2018.00090] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 02/26/2018] [Indexed: 12/29/2022] Open
Abstract
Pituitary adenylate cyclase activating polypeptide (PACAP) is a multifunctional neuropeptide with widespread occurrence throughout the body including the gastrointestinal system. In the small and large intestine, effects of PACAP on cell proliferation, secretion, motility, gut immunology and blood flow, as well as its importance in bowel inflammatory reactions and cancer development have been shown and reviewed earlier. However, no current review is available on the actions of PACAP in the stomach in spite of numerous data published on the gastric presence and actions of the peptide. Therefore, the aim of the present review is to summarize currently available data on the distribution and effects of PACAP in the stomach. We review data on the localization of PACAP and its receptors in the stomach wall of various mammalian and non-mammalian species, we then give an overview on PACAP's effects on secretion of gastric acid and various hormones. Effects on cell proliferation, differentiation, blood flow and gastric motility are also reviewed. Finally, we outline PACAP's involvement and changes in various human pathological conditions.
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Affiliation(s)
- Dora Reglodi
- Department of Anatomy, MTA-PTE PACAP Research Team, Centre for Neuroscience, University of Pecs Medical School, Pecs, Hungary
- *Correspondence: Dora Reglodi,
| | - Anita Illes
- Department of Anatomy, MTA-PTE PACAP Research Team, Centre for Neuroscience, University of Pecs Medical School, Pecs, Hungary
- 1st Department of Internal Medicine, University of Pecs Medical School, Pecs, Hungary
| | - Balazs Opper
- Department of Anatomy, MTA-PTE PACAP Research Team, Centre for Neuroscience, University of Pecs Medical School, Pecs, Hungary
| | - Eszter Schafer
- Department of Gastroenterology, Medical Centre, Hungarian Defence Forces, Budapest, Hungary
| | - Andrea Tamas
- Department of Anatomy, MTA-PTE PACAP Research Team, Centre for Neuroscience, University of Pecs Medical School, Pecs, Hungary
| | - Gabriella Horvath
- Department of Anatomy, MTA-PTE PACAP Research Team, Centre for Neuroscience, University of Pecs Medical School, Pecs, Hungary
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Huang J, Waters KA, Machaalani R. Pituitary adenylate cyclase activating polypeptide (PACAP) and its receptor 1 (PAC1) in the human infant brain and changes in the Sudden Infant Death Syndrome (SIDS). Neurobiol Dis 2017; 103:70-77. [PMID: 28392470 DOI: 10.1016/j.nbd.2017.04.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 04/05/2017] [Accepted: 04/05/2017] [Indexed: 11/19/2022] Open
Abstract
Pituitary adenylate cyclase activating polypeptide (PACAP) and its complementary receptor, PAC1, are crucial in central respiratory control. PACAP Knockout (KO) mice exhibit a SIDS-like phenotype, with an inability to overcome noxious insults, compression of baseline ventilation, and death in the early post-neonatal period. PAC1 KO demonstrate similar attributes to PACAP-null mice, but with the addition of increased pulmonary artery pressure, consequently leading to heart failure and death. This study establishes a detailed interpretation of the neuroanatomical distribution and localization of both PACAP and PAC1 in the human infant brainstem and hippocampus, to determine whether any changes in expression are evident in infants who died of Sudden Infant Death Syndrome (SIDS) and any relationships to risk factors of SIDS including smoke exposure and sleep related parameters. Immunohistochemistry for PACAP and PAC1 was performed on formalin fixed and paraffin embedded human infant brain tissue of SIDS (n=32) and non-SIDS (n=12). The highest expression of PACAP was found in the hypoglossal (XII) of the brainstem medulla and lowest expression in the subiculum of the hippocampus. Highest expression of PAC1 was also found in XII of the medulla and lowest in the midbrain dorsal raphe (MBDR) and inferior colliculus. SIDS compared to non-SIDS had higher PACAP in the MBDR (p<0.05) and lower PAC1 in the medulla arcuate nucleus (p<0.001). Correlations were found between PACAP and PAC1 with the risk factors of smoke exposure, bed sharing, upper respiratory tract infection (URTI) and seasonal temperatures. The findings of this study show for the first time that some abnormalities of the PACAP system are evident in the SIDS brain and could contribute to the mechanisms of infants succumbing to SIDS.
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Affiliation(s)
- J Huang
- Department of Medicine, Sydney Medical School, University of Sydney, NSW, Australia; BOSCH Institute of Biomedical Research, University of Sydney, NSW, Australia
| | - K A Waters
- Department of Medicine, Sydney Medical School, University of Sydney, NSW, Australia; Discipline of Child and Adolescent Health, The Children's Hospital, Westmead, NSW, Australia
| | - R Machaalani
- Department of Medicine, Sydney Medical School, University of Sydney, NSW, Australia; BOSCH Institute of Biomedical Research, University of Sydney, NSW, Australia; Discipline of Child and Adolescent Health, The Children's Hospital, Westmead, NSW, Australia.
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Agnese M, Valiante S, Rosati L, Andreuccetti P, Prisco M. Pituitary adenylate cyclase-activating peptide (PACAP) and PAC1 receptor in the testis of cartilaginous fish Torpedo marmorata: A molecular and phylogenetic study. Comp Biochem Physiol B Biochem Mol Biol 2016; 191:26-35. [DOI: 10.1016/j.cbpb.2015.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 09/08/2015] [Accepted: 09/08/2015] [Indexed: 11/27/2022]
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Gorgoglione B, Carpio Y, Secombes CJ, Taylor NGH, Lugo JM, Estrada MP. Viral and bacterial septicaemic infections modulate the expression of PACAP splicing variants and VIP/PACAP receptors in brown trout immune organs. FISH & SHELLFISH IMMUNOLOGY 2015; 47:923-932. [PMID: 26481517 DOI: 10.1016/j.fsi.2015.10.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 09/17/2015] [Accepted: 10/12/2015] [Indexed: 06/05/2023]
Abstract
Pituitary Adenylate Cyclase-Activating Polypeptide (PACAP) and PACAP-Related Peptide (PRP) are structurally similar peptides encoded in the same transcripts. Their transcription has been detected not only in the brain but also in a wide range of peripheral tissues, even including organs of the immune system. PACAP exerts pleiotropic activities through G-protein coupled membrane receptors: the PACAP-specific PAC-1 and the VPAC-1 and VPAC-2 receptors that exhibit similar affinities for the Vasoactive Intestinal Peptide (VIP) and PACAP. Recent findings added PACAP and its receptors to the growing list of mediators that allow cross-talk between the nervous, endocrine and immune systems in fish. In this study the expression of genes encoding for PACAP and PRP, as well as VIP/PACAP receptors was studied in laboratory-reared brown trout (Salmo trutta) after septicaemic infections. Respectively Viral Haemorrhagic Septicaemia Virus (VHSV-Ia) or the Gram-negative bacterium Yersinia ruckeri (ser. O1 - biot. 2) were used in infection challenges. Kidney and spleen, the teleost main lymphopoietic organs, were sampled during the first two weeks post-infection. RT-qPCR analysis assessed specific pathogens burden and gene expression levels. PACAP and PRP transcription in each organ was positively correlated to the respective pathogen burden, assessed targeting the VHSV-glycoprotein or Y. ruckeri 16S rRNA. Results showed as the transcription of PACAP splicing variants and VIP/PACAP receptors is modulated in these organs during an acute viral and bacterial septicaemic infections in brown trout. These gene expression results provide clues as to how the PACAP system is modulated in fish, confirming an involvement during active immune responses elicited by both viral and bacterial aetiological agents. However, further experimental evidence is still required to fully elucidate and characterize the role of PACAP and PRP for an efficient immune response against pathogens.
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Affiliation(s)
- Bartolomeo Gorgoglione
- Scottish Fish Immunology Research Centre, School of Biological Sciences, University of Aberdeen, Scotland, UK; CEFAS Weymouth Laboratory, Weymouth, England, UK
| | - Yamila Carpio
- Aquatic Biotechnology Project, Centre for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Christopher J Secombes
- Scottish Fish Immunology Research Centre, School of Biological Sciences, University of Aberdeen, Scotland, UK
| | | | - Juana María Lugo
- Aquatic Biotechnology Project, Centre for Genetic Engineering and Biotechnology, Havana, Cuba
| | - Mario Pablo Estrada
- Aquatic Biotechnology Project, Centre for Genetic Engineering and Biotechnology, Havana, Cuba.
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Wang X, Wei H, Zhao T, Zhu X, Yang X, Chen D, Zhou H. Evidence for pituitary adenylate cyclase-activating peptide as a direct immunoregulator in teleost head kidney. FISH & SHELLFISH IMMUNOLOGY 2013; 34:265-272. [PMID: 23153905 DOI: 10.1016/j.fsi.2012.11.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 10/20/2012] [Accepted: 11/02/2012] [Indexed: 06/01/2023]
Abstract
In mammals, pituitary adenylate cyclase activating polypeptide (PACAP) is a potent anti-inflammatory factor, showing that it inhibits the expression and release of proinflammatory cytokines and enhances the production of anti-inflammatory factors. However, whether fish PACAP plays similar regulatory roles as seen in mammals remains unclear. In the present study, expression of PACAP-specific receptor PAC1-R was shown in grass carp head kidney and spleen, supporting that PACAP may have a direct effect on fish immune cells. To test this hypothesis, the immunoregulatory role of grass carp PACAP (gcPACAP) was examined in head kidney leucocytes (HKLs). Results showed that gcPACAP inhibited basal and further attenuated lipopolysaccharide (LPS)-stimulated cell viability of HKLs, indicating that gcPACAP may possess similar inhibitory property at cellular level as seen in mammals. Curiously, in vitro and in vivo studies revealed that gcPACAP stimulated proinflammatory factors (IL-1β and TNF-α) but not IL-10 mRNA expression in HKLs and head kidney. Moreover, bacterial infection and LPS enhanced IL-1β, TNF-α and IL-10 mRNA expression in grass carp head kidney and HKLs, respectively, and these stimulatory effects were not influenced by gcPACAP. These findings suggest that PACAP plays distinct roles, at least does not function as an anti-inflammatory factor, in fish compared with that in mammals.
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Affiliation(s)
- Xinyan Wang
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China
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Agnese M, Valiante S, Laforgia V, Andreuccetti P, Prisco M. Cellular localization of PACAP and its receptors in the ovary of the spotted ray Torpedo marmorata Risso 1880 (Elasmobranchii: Torpediniformes). ACTA ACUST UNITED AC 2012; 319:1-9. [PMID: 23027597 DOI: 10.1002/jez.1764] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 08/01/2012] [Accepted: 08/15/2012] [Indexed: 11/12/2022]
Abstract
The pituitary adenylate cyclase-activating polypeptide (PACAP) is a member of the glucagon-related family and occurs in two amidated forms, PACAP38 and PACAP27, with 38 and 27 amino acids, respectively. PACAP acts by binding to three different receptors, that are classified by their binding affinity for PACAP and VIP (vasoactive intestinal polypeptide): PAC(1)R (PACAP-specific receptor) exclusively binds PACAP, while VPAC(1)R (VIP/PACAP receptor, subtype 1) and VPAC(2)R (VIP/PACAP receptor, subtype 2) bind both PACAP and VIP. PACAP, first discovered in the brain, was then localized in several peripheral tissues of mammals, including the ovary. Besides mammals, PACAP and its receptors have been reported in fish too; however, less is known about the presence of PACAP in the fish ovary and the studies are limited to teleosts. The aim of our work was to study the distribution of the PACAP/PACAP-Rs system in the ovary of the cartilaginous fish Torpedo marmorata. Using in situ hybridization (ISH) and immunohistochemistry techniques, we demonstrated that PACAP and its receptors are widely represented in the Torpedo ovary in a stage-dependent manner. Moreover, our findings suggest an involvement of this peptide in the whole follicologenesis, probably influencing steroidogenesis, follicle development, and oocyte growth.
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Affiliation(s)
- Marisa Agnese
- Evolutionary and Comparative Biology Division, Department of Biological Sciences, University of Naples Federico II, Napoli, Italy
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Tseng HL, Li CJ, Huang LH, Chen CY, Tsai CH, Lin CN, Hsu HY. Quercetin 3-O-methyl ether protects FL83B cells from copper induced oxidative stress through the PI3K/Akt and MAPK/Erk pathway. Toxicol Appl Pharmacol 2012; 264:104-13. [DOI: 10.1016/j.taap.2012.07.022] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 07/19/2012] [Accepted: 07/20/2012] [Indexed: 11/28/2022]
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Nam BH, Moon JY, Kim YO, Kong HJ, Kim WJ, Kim DG, Jee YJ, Lee SJ. Structural and functional characterization of pituitary adenylyl cyclase-activating polypeptide (PACAP)/PACAP-related peptide (PRP) and its receptor in olive flounder (Paralichthys olivaceus). Comp Biochem Physiol B Biochem Mol Biol 2012; 164:18-28. [PMID: 23026070 DOI: 10.1016/j.cbpb.2012.09.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 09/12/2012] [Accepted: 09/13/2012] [Indexed: 11/28/2022]
Abstract
We identified full-length cDNAs encoding pituitary adenylyl cyclase-activating polypeptide (PACAP), PACAP-related peptide (PRP), and PACAP-specific receptor (PAC1R) from olive flounder, Paralichthys olivaceus. Two variant mRNA forms were created by alternative splicing. Comparison of genomic and cDNA sequences of the PRP-PACAP precursor revealed that skipping of exon 4 within PRP resulted in two variant transcripts: a long form encoding both PRP and PACAP and a short form encoding PACAP only. Both transcripts were constitutively observed only in the brain, whereas the short form appeared in gut tissues, such as the intestine and pyloric cecum in fish challenged with a pathogen, but not in healthy fish. Furthermore, expression of the long PRP/PACAP transcript gradually increased in the intestine of flounder challenged with bacteria, suggesting that PRP and/or PACAP may serve as a regulator(s) of the immune system, especially in the gastrointestinal tract of olive flounder. The biological functions of PACAP and PRP were investigated by exogenous treatment of flounder embryogenic cells (hirame natural embryonic cells, HINAE cells) with synthetic peptides of fPACAP-38 and/or fPRP-45. Intracellular cyclic adenosine monophosphate (cAMP) production in PAC1R-overexpressing HINAE cells was regulated by fPACAP-38 in a concentration-dependent manner, but was not regulated by fPRP-45. Results from real-time quantitative polymerase chain reaction revealed that PAC1R mRNA was specifically induced by fPACAP-38 but not by fPRP-45; PACAP significantly increased TNF-α mRNA but not growth hormone (GH) mRNA in HINAE cells; however, PRP affected GH but not TNF-α mRNA expression. These results suggest that the expression ratio of PRP and PACAP is regulated at the transcriptional level depending on the tissues and conditions, and that the unique biological roles of PRP and PACAP differ from that of mammalian PRP.
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Affiliation(s)
- Bo-Hye Nam
- Biotechnology Research Division, National Fisheries Research and Development Institute, Gijang-eup, Gijang-gun, Busan, Republic of Korea.
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Li CJ, Chu CY, Huang LH, Wang MH, Sheu LF, Yeh JI, Hsu HY. Synergistic anticancer activity of triptolide combined with cisplatin enhances apoptosis in gastric cancer in vitro and in vivo. Cancer Lett 2012; 319:203-213. [DOI: 10.1016/j.canlet.2012.01.006] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 12/28/2011] [Accepted: 01/10/2012] [Indexed: 11/25/2022]
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Reglodi D, Kiss P, Horvath G, Lubics A, Laszlo E, Tamas A, Racz B, Szakaly P. Effects of pituitary adenylate cyclase activating polypeptide in the urinary system, with special emphasis on its protective effects in the kidney. Neuropeptides 2012; 46:61-70. [PMID: 21621841 DOI: 10.1016/j.npep.2011.05.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Accepted: 05/03/2011] [Indexed: 10/18/2022]
Abstract
Pituitary adenylate cyclase activating polypeptide (PACAP) is a widespread neuropeptide with diverse effects in the nervous system and peripheral organs. One of the most well-studied effects of PACAP is its cytoprotective action, against different harmful stimuli in a wide variety of cells and tissues. PACAP occurs in the urinary system, from the kidney to the lower urinary tract. The present review focuses on the nephroprotective effects of PACAP and summarizes data obtained regarding the protective effects of PACAP in different models of kidney pathologies. In vitro data show that PACAP protects tubular cells against oxidative stress, myeloma light chain, cisplatin, cyclosporine-A and hypoxia. In vivo data provide evidence for its protective effects in ischemia/reperfusion, cisplatin, cyclosporine-A, myeloma kidney injury, diabetic nephropathy and gentamicin-induced kidney damage. Results accumulated on the renoprotective effects of PACAP suggest that PACAP is an emerging candidate for treatment of human kidney pathologies.
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Affiliation(s)
- Dora Reglodi
- Department of Anatomy, University of Pecs, Szigeti u 12, 7624 Pecs, Hungary.
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Cloning and differential expression pattern of pituitary adenylyl cyclase-activating polypeptide and the PACAP-specific receptor in darkbarbel catfish Pelteobagrus vachelli. Comp Biochem Physiol B Biochem Mol Biol 2012; 161:41-53. [DOI: 10.1016/j.cbpb.2011.09.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 09/11/2011] [Accepted: 09/11/2011] [Indexed: 11/18/2022]
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Lugo JM, Tafalla C, Leceta J, Gomariz RP, Estrada MP. Differential expression pattern of pituitary adenylate cyclase-activating polypeptide (PACAP) alternative splicing variants and its receptors in the immune system of rainbow trout (Oncorhynchus mykiss). FISH & SHELLFISH IMMUNOLOGY 2011; 30:734-738. [PMID: 21168508 DOI: 10.1016/j.fsi.2010.12.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 11/03/2010] [Accepted: 12/12/2010] [Indexed: 05/30/2023]
Abstract
There are different studies concerning the immune functions of pituitary adenylate cyclase-activating polypeptide (PACAP), however information of its source in lymphoid organs is still scarce. Although the occurrence of the PACAP receptors PAC1, VPAC1 and VPAC2 in the immune system of mammals is known, only limited studies have reported the presence of some of these receptors in lymphoid organs in fish. In this work, we have studied both the expression of the two PACAP transcriptional variants (PRP/PACAP and PACAP) together with their receptors in diverse lymphoid organs of the rainbow trout (Oncorhynchus mykiss). Our results demonstrate for the first time in fish the presence of both transcripts in spleen, in which immunohistochemistry confirmed the production of PACAP by lymphocyte-like cells. In contrast, PACAP but not PRP/PACAP mRNA was detected in gills. Additionally, we observed a differential expression pattern of the PAC1, the PACAP specific receptor, with respect to VPAC1 and VPAC2 in lymphoid organs of fish. All receptors were detected in brain, intestine and spleen. By contrast, PAC1 and VPAC1 receptors but not VPAC2 were found in peripheral blood and in RTS11 rainbow trout monocyte/macrophage cells. Besides, in gills and skin, PAC1 and VPAC2 but not VPAC1 were observed, whereas in head kidney, the PAC1 receptor was the only one detected. In general, our finding added PACAP and its receptors to the list of neuroendocrine molecules present in the fish immune system, suggesting a direct autocrine/paracrine mechanism of PACAP action to mediate immune function in fish.
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Affiliation(s)
- Juana Maria Lugo
- Departamento de Biotecnología Acuática, Centro de Ingeniería Genética y Biotecnología, Habana 10600, Cuba
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Agnese M, Valiante S, Angelini F, Laforgia V, Andreuccetti P, Prisco M. Pituitary adenylate cyclase-activating polypeptide and its receptor PAC1 in the testis of Triturus carnifex and Podarcis sicula. Gen Comp Endocrinol 2010; 168:256-61. [PMID: 20338177 DOI: 10.1016/j.ygcen.2010.03.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2009] [Revised: 03/18/2010] [Accepted: 03/19/2010] [Indexed: 10/19/2022]
Abstract
The pituitary adenylate cyclase-activating polypeptide (PACAP) is a member of the glucagon-related family that occurs in two amidated forms with 38 (PACAP38) and 27 (PACAP27) amino acids. First discovered in the brain, it was then localized in several peripheral tissues of mammals, including the testis. However, current knowledge of the expression and function of PACAP and its receptor PAC(1) in the reproductive system of non-mammalian vertebrates, and particularly in the testis, is still limited. The aim of this work was to study the presence of PACAP and its receptor PAC(1) in the testis of two non-mammalian vertebrates during the breeding season: the crested newt Triturus carnifex and the wall lizard Podarcis sicula. The expression and distribution of this neuropeptide and its receptor PAC(1) were investigated by using in situ hybridization and immunohistochemistry techniques. Our results demonstrated that PACAP and its receptor PAC(1) were highly represented in the testis of these two species. In particular, we showed that they are present within some germ cells and that PACAP, unlike in mammals, is expressed also in the somatic cells (Sertoli and Leydig cells) of the testis of these two non-mammalian vertebrates, suggesting that this neuropeptide is involved in the hormonal control of spermatogenesis and steroidogenesis.
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Affiliation(s)
- Marisa Agnese
- Department of Biological Sciences, University of Naples Federico II, Via Mezzocannone 8, 80134 Napoli, Italy.
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Horvath G, Brubel R, Kovacs K, Reglodi D, Opper B, Ferencz A, Szakaly P, Laszlo E, Hau L, Kiss P, Tamas A, Racz B. Effects of PACAP on oxidative stress-induced cell death in rat kidney and human hepatocyte cells. J Mol Neurosci 2010; 43:67-75. [PMID: 20676802 DOI: 10.1007/s12031-010-9428-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Accepted: 07/07/2010] [Indexed: 11/30/2022]
Abstract
Oxidative stress plays an important role in various renal and hepatic pathologies, and reduction of oxidative stress-induced processes is an important protective strategy in tissues of diverse origins against harmful stimuli. Pituitary adenylate cyclase activating polypeptide (PACAP) is a well-known cytotrophic and cytoprotective peptide. PACAP promotes cell survival in numerous cells and tissues exposed to various stimuli. Protective effects of PACAP have been shown in the kidney, but it is not known whether PACAP is protective against oxidative stress in renal cells. Little is known about the effects of PACAP in the liver. The aim of the present study was to investigate whether PACAP is protective against oxidative stress in primary rat kidney cell culture and whether PACAP has any effect on cell survival in human WRL-68 hepatocytes and HEP-G2 hepatocellular carcinoma cells subjected to oxidative stress. Cells were exposed to various concentrations of H(2)O(2) with or without PACAP co-treatment and cell viability was evaluated with the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide test (MTT). We found that oxidative stress induced a significant decrease in cell viability in both cell lines. PACAP could dose-dependently increase the percentage of living cells in kidney cells, but it failed to do so in hepatocytes. Given the survival-promoting effects of PACAP against oxidative stress in rat kidney, we conducted a further experiment to determine whether PACAP influences the markers of oxidative stress in vivo. We have proven earlier that PACAP was effective in kidney ischemia/reperfusion injury in vivo. In the present study, we determined the levels of the oxidative stress marker malondialdehyde and the activity of the scavenger molecules glutathione (GSH) and superoxide dismutase (SOD) following kidney ischemia/reperfusion in rats. We found that PACAP significantly increased the level of GSH and counteracted the marked reduction of SOD activity after ischemia/reperfusion in vivo. In summary, the present study showed that while PACAP was able to significantly increase the cell survival in primary kidney cell cultures exposed to oxidative stress, possibly involving interaction with the endogenous scavenger system, it failed to influence the viability of normal or cancerous hepatocytes.
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Affiliation(s)
- Gabriella Horvath
- Department of Anatomy, University of Pécs, Szigeti u 12, 7624, Pécs, Hungary.
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