151
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Hannan RD, Luyken J, Rothblum LI. Regulation of rDNA transcription factors during cardiomyocyte hypertrophy induced by adrenergic agents. J Biol Chem 1995; 270:8290-7. [PMID: 7713937 DOI: 10.1074/jbc.270.14.8290] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Ribosomal DNA transcription is important to the regulation of cardiomyocyte ribosome content and, as a consequence, the rate of protein synthesis and accumulation during cardiac hypertrophy. We studied the regulation of ribosomal RNA synthesis and the levels of RNA polymerase I and the ribosomal DNA transcription factor, UBF, during norepinephrine-induced hypertrophy of contraction-arrested neonatal cardiomyocytes in culture. Nuclear run-on assays and Western blots demonstrated that, concomitant with hypertrophy, norepinephrine (1 microM) increased the rate of ribosomal DNA transcription, without causing an increase in the amount of RNA polymerase I. However, the elevated rate of rRNA synthesis was accompanied by an increased cellular content of UBF protein as determined by Western analysis. Northern blots demonstrated norepinephrine-induced increases in UBF mRNA in neonatal cardiomyocytes indicating that the response was regulated, at least in part, at the pretranslational stage. Both alpha- and beta-adrenergic agents increased the level of UBF mRNA. The beta-adrenergic response was mimicked by forskolin (1 microM) and the cyclic AMP analog dibutyryl cAMP (10 microM). However, activation of protein kinase C by phorbol 12-myristate 13-acetate (0.1 microM) did not increase expression of UBF. These results implicate UBF as a possible regulatory factor of the accelerated rDNA transcription observed during norepinephrine-mediated cardiomyocyte hypertrophy.
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MESH Headings
- Adrenergic Agents/pharmacology
- Animals
- Cardiomegaly/chemically induced
- Cardiomegaly/metabolism
- Cells, Cultured
- DNA, Ribosomal/genetics
- DNA-Binding Proteins/metabolism
- Heart/drug effects
- Myocardium/cytology
- Myocardium/metabolism
- Norepinephrine/pharmacology
- Pol1 Transcription Initiation Complex Proteins
- RNA Polymerase I/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Sprague-Dawley
- Receptors, Adrenergic, alpha/physiology
- Receptors, Adrenergic, beta/physiology
- Transcription Factors/metabolism
- Transcription, Genetic
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Affiliation(s)
- R D Hannan
- Sigfried and Janet Weis Center for Research, Geisinger Clinic, Danville, Pennsylvania 17822, USA
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152
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Van Heugten HA, De Jonge HW, Bezstarosti K, Sharma HS, Verdouw PD, Lamers JM. Intracellular signaling and genetic reprogramming during agonist-induced hypertrophy of cardiomyocytes. Ann N Y Acad Sci 1995; 752:343-52. [PMID: 7755279 DOI: 10.1111/j.1749-6632.1995.tb17443.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- H A Van Heugten
- Department of Biochemistry, Cardiovascular Research Institute COEUR, Faculty of Medicine & Health Sciences, Erasmus University Rotterdam, The Netherlands
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153
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Kimura I, Takamura Y, Uwano T, Hata Y, Kimura M, Kikuchi T. Activation of protein kinase C from guinea-pig and rat ventricular muscles by musclide-A1 and its (2R, 5S)-diastereomer. Phytother Res 1995. [DOI: 10.1002/ptr.2650090105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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154
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Gene Expression in Cardiac Hypertrophy. MOLECULAR BIOLOGY OF CARDIAC DEVELOPMENT AND GROWTH 1995. [DOI: 10.1007/978-3-662-22192-1_5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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155
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Van Heugten HAA, De Jonge HW, Goedbloed MA, Bezstarosti K, Sharma HS, Verdouw PD, Lamers JMJ. Intracellular Signaling and Genetic Reprogramming During Development of Hypertrophy in Cultured Cardiomyocytes. DEVELOPMENTS IN CARDIOVASCULAR MEDICINE 1995. [DOI: 10.1007/978-1-4613-1237-6_7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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156
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Affiliation(s)
- S F Steinberg
- Department of Medicine, Columbia University, New York, NY 10032, USA
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157
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Decock JB, Gillespie-Brown J, Parker PJ, Sugden PH, Fuller SJ. Classical, novel and atypical isoforms of PKC stimulate ANF- and TRE/AP-1-regulated-promoter activity in ventricular cardiomyocytes. FEBS Lett 1994; 356:275-8. [PMID: 7805853 DOI: 10.1016/0014-5793(94)01283-0] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Cultured neonatal rat ventricular myocytes were co-transfected with expression plasmids encoding protein kinase C (PKC) isoforms from each of the PKC subfamilies (classical PKC-alpha, novel PKC-epsilon or atypical PKC-zeta) together with an atrial natriuretic factor (ANF) reporter plasmid. Each PKC had been rendered constitutively active by a single Ala-->Glu mutation or a small deletion in the inhibitory pseudosubstrate site. cPKC-alpha, nPKC-epsilon or aPKC-zeta expression plasmids each stimulated ANF-promoter activity and expression of a reporter gene under the control of a 12-O-tetradecanoylphorbol 13-acetate-response element (TRE). Upregulation of the ANF promoter is characteristic of the hypertrophic response in the heart ventricle and a TRE is present in the ANF promoter. Thus all subfamilies of PKC may have the potential to contribute to hypertrophic response in cardiomyocytes.
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Affiliation(s)
- J B Decock
- Department of Cardiac Medicine, National Heart and Lung Institute, University of London, UK
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158
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Differential activation of protein kinase C isoforms by endothelin-1 and phenylephrine and subsequent stimulation of p42 and p44 mitogen-activated protein kinases in ventricular myocytes cultured from neonatal rat hearts. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(20)30069-7] [Citation(s) in RCA: 194] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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159
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Asotra K, Macklin WB. Developmental expression of protein kinase C isozymes in oligodendrocytes and their differential modulation by 4 beta-phorbol-12,13-dibutyrate. J Neurosci Res 1994; 39:273-89. [PMID: 7869420 DOI: 10.1002/jnr.490390305] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Myelin gene expression in normal oligodendrocytes (OLG) depends on developmentally regulated protein kinase C (PKC) enzyme activity (Asotra and Macklin: J Neurosci Res 34:571-588, 1993). We studied the developmental expression of the Ca(++)-dependent PKC-alpha, -beta 1, -beta II and -gamma isozymes, and the Ca(++)-independent PKC-delta, -epsilon, -zeta and -eta isozymes in enriched rat brain OLG cultures. In A2B5+ O-2A progenitors, only PKC-delta, PKC-epsilon and PKC-zeta were detected immunocytochemically. In 04+ proligondendrocytes, PKC-beta I, -delta and -zeta were expressed moderately and low levels of PKC-alpha and -epsilon were detected. GD3+ OLG, GC+ OLG and MBP+ OLG showed increased levels of PKC-alpha, -beta I, -delta and -zeta isozymes. PKC-beta II, -gamma and -eta were poorly expressed in OLG. On immunoblots, PKC-alpha was present early and increased continually up to 18 days but PKC-beta I increased until 12 days in cultured OLG. High levels of PKC-delta, PKC-epsilon and PKC-zeta, the most abundant PKC isozymes in OLG, were maintained up to 12 days and were then slightly reduced. Interestingly, relatively high levels of PKC-alpha, PKC-beta I, PKC-beta II, PKC-gamma and PKC-epsilon isozymes were detected in purified myelin membrane although greater levels of PKC-delta were found in OLG than in purified myelin. Thus, most of the PKC isozymes found in cultured OLG were also present in myelin, although at different levels. Treatment with 50 nM 4 beta-phorbol-12,13-dibutyrate (PDB) caused a delayed downregulation of PKC-delta levels after 8 hr without modulating the expression of other PKC isozymes in 1-day OLG; in the 3-day-old and 6-day-old OLG, PDB downmodulated PKC-beta I, -delta and epsilon isozymes with only a minor effect on PKC-alpha and no reduction in PKC-zeta. Induction or downmodulation of individual PKC isozymes by phorbol esters appears to depend on the differentiation state of OLG. These data suggest that PKC-beta I, -delta and -epsilon isozymes have an important function in different cellular events of OLG differentiation. We conclude that the PKC-dependent modulation of myelin gene expression in OLG results predominantly from the Ca(++)-dependent PKC-beta I isozyme activity and the CA(++)-independent PKC-delta and PKC-epsilon activitives in a cell differentiation state-dependent manner.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- K Asotra
- Department of Psychiatry and Biobehavioral Sciences, UCLA Medical Center
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160
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Downey JM, Cohen MV, Ytrehus K, Liu Y. Cellular mechanisms in ischemic preconditioning: the role of adenosine and protein kinase C. Ann N Y Acad Sci 1994. [PMID: 8030927 DOI: 10.1111/j.1749-6632.1994.tb36719.x] [Citation(s) in RCA: 95] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J M Downey
- Department of Physiology, University of South Alabama, Mobile 36688
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161
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Pucéat M, Hilal-Dandan R, Strulovici B, Brunton L, Brown J. Differential regulation of protein kinase C isoforms in isolated neonatal and adult rat cardiomyocytes. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(19)89480-2] [Citation(s) in RCA: 205] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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162
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VAN HEUGTEN HANAA, BEZSTAROSTI KAREL, LAMERS JOSMJ. Endothelin-Induced Response of the Phosphatidylinositol Cycle in Cultured Cardiomyocytes Exposed to Substrate-Free Hypoxia-Reoxygenation a. Ann N Y Acad Sci 1994. [DOI: 10.1111/j.1749-6632.1994.tb36740.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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163
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Komuro I, Yazaki Y. Intracellular signaling pathways in cardiac myocytes induced by mechanical stress. Trends Cardiovasc Med 1994; 4:117-21. [DOI: 10.1016/1050-1738(94)90063-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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164
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Fitzgerald M, Anderson KE, Woodcock EA. Inositol-1,4,5-trisphosphate [ins(1,4,5)P3] and ins(1,4,5)P3 receptor concentrations in heart tissues. Clin Exp Pharmacol Physiol 1994; 21:257-60. [PMID: 8076433 DOI: 10.1111/j.1440-1681.1994.tb02509.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
1. The isolation and culture of neonatal cardiomyocytes causes changes in the metabolism of inositol(1,4,5) trisphosphate (Ins(1,4,5)P3) from primarily dephosphorylation in the intact tissue to a combination of phosphorylation and dephosphorylation in the cultured cells (Woodcock et al. 1992). 2. The content of Ins(1,4,5)P3 was found to be higher in intact heart tissue than in the isolated neonatal cells (10.9 +/- 1.3 and 0.5 +/- 0.1 pmol/mg tissue, mean +/- s.e.m., n = 4, P < 0.002, respectively). 3. Despite this difference, Ins(1,4,5)P3 receptors in intact tissue and in isolated cells were not different in terms of affinity (8.0 +/- 1.7 and 10.9 +/- 1.6 nmol/L, n = 3, respectively) or concentration (143.3 +/- 20.5 and 91.2 +/- 16.0 fmol/mg protein, n = 3, respectively). 4. Thus, while there appears to be a relationship between the tissue content of Ins(1,4,5)P3 and its metabolism, no relationship to the properties of Ins(1,4,5)P3 receptors could be demonstrated.
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Affiliation(s)
- M Fitzgerald
- Cellular Biochemistry Laboratory, Baker Medical Research Institute, Prahran, Victoria, Australia
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165
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Lokuta A, Cooper C, Gaa S, Wang H, Rogers T. Angiotensin II stimulates the release of phospholipid-derived second messengers through multiple receptor subtypes in heart cells. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37619-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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166
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Wilkinson SE, Hallam TJ. Protein kinase C: is its pivotal role in cellular activation over-stated? Trends Pharmacol Sci 1994; 15:53-7. [PMID: 8165725 DOI: 10.1016/0165-6147(94)90110-4] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Evidence has emerged over the past decade to suggest that protein kinase C (PKC) is a widespread family of kinases responsible for many diverse and critical cellular functions. With the development of selective agents to activate or inhibit the individual PKC isoenzymes, it is now apparent that much of the literature that implicated PKC in many cellular functions needs to be appraised. In this article, Sandra Wilkinson and Trevor Hallam discuss the problems of the existing methods and the recent evidence that suggests that PKC isotypes are necessary for some, but not all, of those cellular responses where PKC had been thought to play an important role. Selective inhibitors of PKC isoenzymes may have potential for therapeutic use in auto-immune diseases, transplant rejection and oncology.
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167
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Bogoyevitch M, Glennon P, Andersson M, Clerk A, Lazou A, Marshall C, Parker P, Sugden P. Endothelin-1 and fibroblast growth factors stimulate the mitogen-activated protein kinase signaling cascade in cardiac myocytes. The potential role of the cascade in the integration of two signaling pathways leading to myocyte hypertrophy. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)42228-9] [Citation(s) in RCA: 271] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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168
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169
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Damron DS, Van Wagoner DR, Moravec CS, Bond M. Arachidonic acid and endothelin potentiate Ca2+ transients in rat cardiac myocytes via inhibition of distinct K+ channels. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(19)74254-9] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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