Essential role of diastolic oscillatory potentials in adrenergic control of guinea pig sino-atrial node discharge.

Abstract:

BACKGROUND:The diastolic oscillatory after-potential Vos and pre-potential ThVos play an essential role in the pacemaker mechanism of sino-atrial node (SAN). The aim of this study was to investigate whether these oscillatory potentials are also involved in adrenergic control of SAN discharge. METHODS:Vos and ThVos were visualized by superfusing guinea pig SAN in high [K+]o. The actions of adrenergic agonists on oscillatory potentials were studied by means of a microelectrode technique. Statistical significance was determined by means of Student's paired t-test. RESULTS:In non-spontaneous SAN, norepinephrine (NE) decreased the resting potential into a voltage range ("oscillatory zone") where increasingly larger ThVos appeared and initiated spontaneous discharge. In slowly discharging SAN, NE gradually increased the rate by increasing the amplitude and slope of earlier-occurring ThVos and of Vos until these oscillations fused with initial diastolic depolarization (DD1). In the presence of NE, sudden fast rhythms were initiated by large Vos that entered a more negative oscillatory zone and initiated a large ThVos. Recovery from NE exposure involved the converse changes. The beta-adrenergic agonist isoproterenol had similar actions. Increasing calcium load by decreasing high [K+]o, by fast drive or by recovery in Tyrode solution led to growth of Vos and ThVos which abruptly fused when a fast sudden rhythm was induced. Low [Ca2+]o antagonized the adrenergic actions. Cesium (a blocker of If) induced spontaneous discharge in quiescent SAN through ThVos. In spontaneous SAN, Cs+increased Vos and ThVos, thereby increasing the rate. Cs+ did not hinder the positive chronotropic action of NE. Barium increased the rate, as Cs+ did. CONCLUSION:Adrenergic agonists: (i) initiate SAN discharge by decreasing the resting potential and inducing ThVos; (ii) gradually accelerate SAN rate by predominantly increasing size and slope of earlier and more negative ThVos; (iii) can induce sudden fast rhythms through the abrupt fusion of large Vos with large ThVos; (iv) increase Vos and ThVosby increasing cellular calcium; and (v) do not modify the oscillatory potentials by means of the hyperpolarization-activated current If. The results provide evidence for novel mechanisms by which the SAN dominant pacemaker activity is initiated and enhanced by adrenergic agonists.

journal_name

J Biomed Sci

authors

Vassalle M,Catanzaro JN,Nett MP,Rota M

doi

10.1186/1423-0127-16-101

subject

Has Abstract

pub_date

2009-11-18 00:00:00

pages

101

eissn

1021-7770

issn

1423-0127

pii

1423-0127-16-101

journal_volume

16

pub_type

杂志文章
  • Human mesenchymal stem cells (MSCs) for treatment towards immune- and inflammation-mediated diseases: review of current clinical trials.

    abstract::Human mesenchymal stem cells (MSCs) are multilineage somatic progenitor/stem cells that have been shown to possess immunomodulatory properties in recent years. Initially met with much skepticism, MSC immunomodulation has now been well reproduced across tissue sources and species to be clinically relevant. This has ope...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-016-0289-5

    authors: Wang LT,Ting CH,Yen ML,Liu KJ,Sytwu HK,Wu KK,Yen BL

    更新日期:2016-11-04 00:00:00

  • Raloxifene inhibits adipose tissue inflammation and adipogenesis through Wnt regulation in ovariectomized rats and 3 T3-L1 cells.

    abstract:BACKGROUND:Loss of ovarian function, as in menopause or after ovariectomy (OVX), is closely associated with obesity and white adipose tissue (WAT) inflammation. Estrogen replacement protects against postmenopausal obesity but increases the risks of carcinogenesis. In the present study, we investigated the effects of lo...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-019-0556-3

    authors: Shen HH,Yang CY,Kung CW,Chen SY,Wu HM,Cheng PY,Lam KK,Lee YM

    更新日期:2019-08-31 00:00:00

  • Perinatal Pb2+ exposure alters the expression of genes related to the neurodevelopmental GABA-shift in postnatal rats.

    abstract:BACKGROUND:Lead (Pb2+) is an environmental neurotoxicant that disrupts neurodevelopment, communication, and organization through competition with Ca2+ signaling. How perinatal Pb2+ exposure affects Ca2+-related gene regulation remains unclear. However, Ca2+ activates the L-Type voltage sensitive calcium channel β-3 sub...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-018-0450-4

    authors: Neuwirth LS,Phillips GR,El Idrissi A

    更新日期:2018-05-24 00:00:00

  • Different types of variant muscle nociception after intermittent and continuous neuromuscular stimulation in rats.

    abstract::Critical assessment of experimental muscle-pain models resulting from maximal muscle contraction may provide a means of assessing hypersensitivity and the central nociceptive mechanisms involved in diffused muscle pain. The aim of the present study was, therefore, to investigate the patterns of nociceptive behavior an...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/s11373-005-6595-7

    authors: Wang SF,Chen CC,Liao WS,Shyu BC

    更新日期:2005-01-01 00:00:00

  • Therapeutic evaluation of HIV transduction basic domain-conjugated superoxide dismutase solution on suppressive effects of the formation of peroxynitrite and expression of COX-2 in murine skin.

    abstract:BACKGROUND:Homeostasis of reactive oxygen species (ROS) in the skin is regulated by antioxidant defenses. The inflammatory states of skin diseases which range from acute rashes to chronic conditions are related to the level of ROS. The involvement of superoxide dismutase (SOD) in restoring the antioxidant capacity can ...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-016-0226-7

    authors: Liu TP,Chen YP,Chou CM,Chiu TT,Chen CT

    更新日期:2016-01-20 00:00:00

  • Impairment of transneuronal traffic in Streptozotocin-induced diabetes, a WGA-HRP neurohistochemical study in the rat.

    abstract::Retrograde transport of Wheat germ agglutinin conjugated to Horseradish peroxidase (WGA-HRP) was used in labeling vagal neurons projecting to the stomach from the dorsal motor nucleus of the vagus nerve (DMNV) in Streptozotocin (STZ)-induced diabetic rats. Diabetes was induced in the experimental rats by intraperitone...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/s11373-006-9097-3

    authors: Odekunle A

    更新日期:2006-09-01 00:00:00

  • Atherosclerosis and flow: roles of epigenetic modulation in vascular endothelium.

    abstract:BACKGROUND:Endothelial cell (EC) dysfunctions, including turnover enrichment, gap junction disruption, inflammation, and oxidation, play vital roles in the initiation of vascular disorders and atherosclerosis. Hemodynamic forces, i.e., atherprotective pulsatile (PS) and pro-atherogenic oscillatory shear stress (OS), ca...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-019-0551-8

    authors: Lee DY,Chiu JJ

    更新日期:2019-08-07 00:00:00

  • Activation of MEK2 is sufficient to induce skin papilloma formation in transgenic zebrafish.

    abstract:BACKGROUND:Mutations in mitogen-activated protein kinase (MAPK) kinase 1 (MEK1) that occur during cell proliferation and tumor formation are well described. Information on the roles of MEK2 in these effects is still limited. We established a constitutive MEK2 transgenic zebrafish, Tg(krt14:MEK2S219D-GFP), to elucidate ...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-015-0207-2

    authors: Chou CM,Chen YC,Su S,Chen GD,Huang KY,Lien HW,Huang CJ,Cheng CH

    更新日期:2015-11-17 00:00:00

  • Suberoylanilide hydroxamic acid represses glioma stem-like cells.

    abstract:BACKGROUND:Glioma stem-like cells (GSCs) are proposed to be responsible for high resistance in glioblastoma multiforme (GBM) treatment. In order to find new strategies aimed at reducing GSC stemness and improving GBM patient survival, we investigated the effects and mechanism of a histone deacetylases (HDACs) inhibitor...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-016-0296-6

    authors: Hsu CC,Chang WC,Hsu TI,Liu JJ,Yeh SH,Wang JY,Liou JP,Ko CY,Chang KY,Chuang JY

    更新日期:2016-11-18 00:00:00

  • Fish-on-a-chip: a sensitive detection microfluidic system for Alzheimer's disease.

    abstract::Microfluidics has become an important tool in diagnosing many diseases, including neurological and genetic disorders. Alzheimer's disease (AD) is a neurodegenerative disease that irreversibly and progressively destroys memory, language ability, and thinking skills. Commonly, detection of AD is expensive and complex. F...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/1423-0127-18-33

    authors: Devadhasan JP,Kim S,An J

    更新日期:2011-05-28 00:00:00

  • Sympathetic-correlated c-Fos expression in the neonatal rat spinal cord in vitro.

    abstract::An isolated thoracic spinal cord of the neonatal rat in vitro spontaneously generates sympathetic nerve discharge (SND) at ~25 degrees C, but it fails in SND genesis at < or = 10 degrees C. Basal levels of the c-Fos expression in the spinal cords incubated at < or = 10 degrees C and ~25 degrees C were compared to dete...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/1423-0127-16-44

    authors: Su CK,Ho CM,Kuo HH,Wen YC,Chai CY

    更新日期:2009-05-01 00:00:00

  • Hepatitis B virus X protein (HBx) enhances centrosomal P4.1-associated protein (CPAP) expression to promote hepatocarcinogenesis.

    abstract:BACKGROUND:Our previous report suggested that centrosomal P4.1-associated protein (CPAP) is required for Hepatitis B virus (HBV) encoded non-structure protein X (HBx)-mediated nuclear factor kappa light chain enhancer of activated B cells (NF-κB) activation. CPAP is overexpressed in HBV-associated hepatocellular carcin...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-019-0534-9

    authors: Yen CJ,Yang ST,Chen RY,Huang W,Chayama K,Lee MH,Yang SJ,Lai HS,Yen HY,Hsiao YW,Wang JM,Lin YJ,Hung LY

    更新日期:2019-06-06 00:00:00

  • T cells and reactive oxygen species.

    abstract::Reactive oxygen species (ROS) have been long considered simply as harmful by-products of metabolism, which damage cellular proteins, lipids, and nucleic acids. ROS are also known as a weapon of phagocytes, employed against pathogens invading the host. However, during the last decade, an understanding has emerged that ...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-015-0194-3

    authors: Belikov AV,Schraven B,Simeoni L

    更新日期:2015-10-15 00:00:00

  • Role of mitochondrial dysfunction and dysregulation of Ca2+ homeostasis in the pathophysiology of insulin resistance and type 2 diabetes.

    abstract::Metabolic diseases such as obesity, type 2 diabetes (T2D) and insulin resistance have attracted great attention from biomedical researchers and clinicians because of the astonishing increase in its prevalence. Decrease in the capacity of oxidative metabolism and mitochondrial dysfunction are a major contributor to the...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-017-0375-3

    authors: Wang CH,Wei YH

    更新日期:2017-09-07 00:00:00

  • Functional complexity of hair follicle stem cell niche and therapeutic targeting of niche dysfunction for hair regeneration.

    abstract::Stem cell activity is subject to non-cell-autonomous regulation from the local microenvironment, or niche. In adaption to varying physiological conditions and the ever-changing external environment, the stem cell niche has evolved with multifunctionality that enables stem cells to detect these changes and to communica...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-020-0624-8

    authors: Chen CL,Huang WY,Wang EHC,Tai KY,Lin SJ

    更新日期:2020-03-14 00:00:00

  • Solution structure of the X4 protein coded by the SARS related coronavirus reveals an immunoglobulin like fold and suggests a binding activity to integrin I domains.

    abstract::The SARS related Coronavirus genome contains a variety of novel accessory genes. One of these, called ORF7a or ORF8, code for a protein, known as 7a, U122 or X4. We set out to determine the three-dimensional structure of the soluble ectodomain of this type-I transmembrane protein by nuclear magnetic resonance spectros...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/s11373-005-9043-9

    authors: Hänel K,Stangler T,Stoldt M,Willbold D

    更新日期:2006-05-01 00:00:00

  • PAN RNA: transcriptional exhaust from a viral engine.

    abstract::Kaposi's sarcoma-associated herpesvirus (KSHV), also designated human herpesvirus 8 (HHV-8), has been linked to Kaposi's sarcoma, as well as to primary effusion lymphoma (PEL), and a subset of multicentric Castleman's disease. KSHV genomes are maintained as episomes within infected cells and the virus exhibits a bipha...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-020-00637-y

    authors: Campbell M,Izumiya Y

    更新日期:2020-03-07 00:00:00

  • Protein Kinase Activity of the Insulin Receptor Is Essential for Insulin-Regulated Gene Expression.

    abstract::Two Chinese hamster ovary (CHO) cell lines stably transfected with human insulin receptor cDNA, CHO-wt and CHO-mut, which express an equivalent number of normal and kinase-defective human insulin receptors, respectively, were used to assess the roles of insulin receptor tyrosine kinase activity in insulin-regulated ge...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/BF02258333

    authors: Lin SC,Chen MF,Chou CK

    更新日期:1994-12-01 00:00:00

  • B cell subset alteration and the expression of tissue homing molecules in dengue infected patients.

    abstract:BACKGROUND:B cells play an essential role during dengue viral infection. While a major expansion of antibody secreting cells (ASCs) was observed, the importance of these increased frequencies of ASCs remains unclear. The alteration of B cell subsets may result from the expression of tissue specific homing molecules lea...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-018-0467-8

    authors: Pattanapanyasat K,Khowawisetsut L,Chuansumrit A,Chokephaibulkit K,Tangnararatchakit K,Apiwattanakul N,Techasaensiri C,Thitilertdecha P,Sae-Ung T,Onlamoon N

    更新日期:2018-08-27 00:00:00

  • Expedition to the missing link: Long noncoding RNAs in cardiovascular diseases.

    abstract::With the advances in deep sequencing-based transcriptome profiling technology, it is now known that human genome is transcribed more pervasively than previously thought. Up to 90% of the human DNA is transcribed, and a large proportion of the human genome is transcribed as long noncoding RNAs (lncRNAs), a heterogenous...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-020-00647-w

    authors: Yeh CF,Chang YE,Lu CY,Hsuan CF,Chang WT,Yang KC

    更新日期:2020-04-02 00:00:00

  • Modulation of catecholamine release by endogenous adenosine in the rat adrenal medulla.

    abstract::Adenosine was shown to inhibit norepinephrine (NE) release from sympathetic nerve endings. The purpose of this study was to examine whether endogenous adenosine restrains NE and epinephrine release from the adrenal medulla. The effects of an adenosine receptor antagonist, 1,3-dipropyl-8-(p-sulfophenyl) xanthine (DPSPX...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/BF02255947

    authors: Tseng CJ,Chan JY,Lo WC,Jan CR

    更新日期:2001-09-01 00:00:00

  • Expression of cyclooxygenase-2 related to angiogenesis in uterine cervical cancers.

    abstract::Angiogenesis is essential for development, growth and advancement of solid tumors. Cyclooxygenase (COX)-2 is recognized as an angiogenic factor in various tumors. This prompted us to study the clinical implications of COX-2 expression related to angiogenesis in uterine cervical cancers. There was a significant correla...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/s11373-006-9114-6

    authors: Fujimoto J,Toyoki H,Sato E,Sakaguchi H,Jahan I,Alam SM,Tamaya T

    更新日期:2006-11-01 00:00:00

  • Ciz1, Cip1 interacting zinc finger protein 1 binds the consensus DNA sequence ARYSR(0-2)YYAC.

    abstract::The matrin 3 family of nuclear proteins consists of members with potentially diverse activities. Matrin 3 and NP220 share RNA-binding domains, and NP220 has been shown to recognize and bind to the DNA sequence, CCCCC (G/C). We have isolated and characterized another member of the matrin 3 family, designated NP94, from...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/BF02256432

    authors: Warder DE,Keherly MJ

    更新日期:2003-07-01 00:00:00

  • Antiviral activity of an N-allyl acridone against dengue virus.

    abstract:BACKGROUND:Dengue virus (DENV), a member of the family Flaviviridae, is at present the most widespread causative agent of a human viral disease transmitted by mosquitoes. Despite the increasing incidence of this pathogen, there are no antiviral drugs or vaccines currently available for treatment or prevention. In a pre...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-015-0134-2

    authors: Mazzucco MB,Talarico LB,Vatansever S,Carro AC,Fascio ML,D'Accorso NB,García CC,Damonte EB

    更新日期:2015-04-17 00:00:00

  • Dimeric dipeptide mimetics of the nerve growth factor Loop 4 and Loop 1 activate TRKA with different patterns of intracellular signal transduction.

    abstract:BACKGROUND:This study aimed at developing nerve growth factor (NGF) mimetics that selectively activate specific biological signals and, as a result, lack the side effects of the full-length protein. Two dimeric dipeptides, bis-(N-aminocaproyl-glycyl-L-lysine) hexamethylenediamide (GK-6) and bis(N-succinyl-L-glutamyl-L-...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-015-0198-z

    authors: Gudasheva TA,Povarnina PY,Antipova TA,Firsova YN,Konstantinopolsky MA,Seredenin SB

    更新日期:2015-12-08 00:00:00

  • Differential expression of protein kinases in cultured primary neurons derived from the cerebral cortex, hippocampus, and sympathetic ganglia.

    abstract::Protein kinases play pivotal roles in the development of the nervous system. They are involved in almost every stage of neuronal development, from initial proliferation and differentiation of progenitor cells to pathfinding of neurites and formation of synapses. Activation of protein kinases is also critical for neuro...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/BF02258364

    authors: Lin SD,Fann MJ

    更新日期:1998-01-01 00:00:00

  • The intracellular domain of cell adhesion molecule 1 is present in emphysematous lungs and induces lung epithelial cell apoptosis.

    abstract:BACKGROUND:Pulmonary emphysema is characterized histologically by destruction of alveolar walls and enlargement of air spaces due to lung epithelial cell apoptosis. Cell adhesion molecule 1 (CADM1) is an immunoglobulin superfamily member expressed in lung epithelial cells. CADM1 generates a membrane-associated C-termin...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1186/s12929-015-0173-8

    authors: Hagiyama M,Yoneshige A,Inoue T,Sato Y,Mimae T,Okada M,Ito A

    更新日期:2015-08-11 00:00:00

  • Different pathways leading to activation of extracellular signal-regulated kinase and p38 MAP kinase by formyl-methionyl-leucyl-phenylalanine or platelet activating factor in human neutrophils.

    abstract::The signaling pathways leading to extracellular signal-regulated kinase (ERK) and p38 mitogen-activated protein kinase (MAPK) activation by N-formyl-Met-Leu-Phe (fMLP) or platelet activating factor (PAF) in human neutrophils were examined. Previously, we found that changes of intracellular Ca2+ ([Ca2+]i) stimulated by...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/s11373-005-1704-1

    authors: Chen LW,Lin MW,Hsu CM

    更新日期:2005-01-01 00:00:00

  • Amelioration of beryllium induced alterations in hepatorenal biochemistry and ultramorphology by co-administration of tiferron and adjuvants.

    abstract::Influence of adjuvants i.e., alpha-tocopherol (25 mg/kg, p.o.) and piperine (10 mg/kg, p.o.) on therapeutic potential of chelator tiferron (300 mg/kg, i.p.) was evaluated to encounter toxicogenic events of beryllium exposure. Albino rats were exposed to beryllium nitrate (1 mg/kg, i.p.) daily for 28 days followed by t...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章

    doi:10.1007/s11373-007-9147-5

    authors: Nirala SK,Bhadauria M,Mathur R,Mathur A

    更新日期:2007-05-01 00:00:00

  • Update on recent preclinical and clinical studies of T790M mutant-specific irreversible epidermal growth factor receptor tyrosine kinase inhibitors.

    abstract::The first- and second-generation epidermal growth factor receptor tyrosine kinase inhibitors (1/2G EGFR-TKIs) gefitinib, erlotinib, and afatinib have all been approved as standard first-line treatments for advanced EGFR mutation-positive non-small cell lung cancer. The third-generation (3G) EGFR-TKIs have been develop...

    journal_title:Journal of biomedical science

    pub_type: 杂志文章,评审

    doi:10.1186/s12929-016-0305-9

    authors: Liao BC,Lin CC,Lee JH,Yang JC

    更新日期:2016-12-03 00:00:00