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Histology and Histopathology Histol Histopathol (2019) 34: 1255-1268 Histology and http://www.hh.um.es FHromi Cseltl Boiolopgya to tTihssuoe Elnogingeerying A sexy approach to pacemaking: differences in function and molecular make up of the sinoatrial node Ursula Doris 1, Sanjay Kharche 1,2 , Maria Petkova 1, Balint Borbas 1, Sunil Jit R.J. Logantha 1, Olga Fedorenko 3,4 , Michal Maczewski 5, Urszula Mackiewicz 4, Yu Zhang 1, Anwar Chahal 6,7 , Alicia D’Souza 1, Andrew J. Atkinson 1, Halina Dobrzynski 1# and Joseph Yanni 1# 1Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, England, 2Department of Biophysics and Lawson Health Research Institute, University of Western Ontario, London, Canada, 3Mental Health Research Institute, Tomsk National Research Medical Centre, 4School of Non-Destructive Testing and Security, National Tomsk Polytechnic University, Tomsk, Russian Federation, 5Medical Centre of Postgraduate Education, Warsaw, Poland, 6Mayo Clinic, Rochester, Minnesota, USA and 7Papworth Hospital NHS Trust, Cambridge, UK #Contributed equally Summary. Background. Functional properties of the Nkx2-5 at mRNA and/or protein levels between male sinoatrial node (SAN) are known to differ between and female SAN. Ca v1.3 plays an important role in the sexes. Women have higher resting and intrinsic heart pacemaker function of the SAN, therefore the higher rates. Sex determines the risk of developing certain intrinsic heart rate of the female SAN could be caused arrhythmias such as sick sinus syndrome, which occur by the higher expression of Ca v1.3. The differences more often in women. We believe that a major identified in this study advance our understanding of sex contributor to these differences is in gender specific ion differences in cardiac electrophysiology and channel expression. arrhythmias. Methods. qPCR was used to compare ion channel gene expression in the SAN and right atrium (RA) Key words: Ion channels, Arrhythmias, Pacemaker of between male and female rats. Histology, the heart, Sinoatrial, Gender, Electrophysiology, immunohistochemistry and signal intensity analysis Computer modelling were used to locate the SAN and determine abundance of ion channels. The effect of nifedipine on extracellular potential recording was used to determine differences in Introduction beating rate between sexes. Results. mRNAs for Ca v1.3, K ir 3.1, and Nkx2-5, as The sinoatrial node (SAN) is the primary pacemaker well as expression of the L-Type Ca 2+ channel protein, of the heart and the origin of depolarization (Dobrzynski were higher in the female SAN. Females had et al., 2013). Evidence shows that SAN function differs significantly higher intrinsic heart rates and the effect of according to sex; males have a slower resting and nifedipine on isolated SAN preparations was intrinsic heart rate due to a longer corrected SAN significantly greater in male SAN. Computer modelling recovery time and atrial refractory period (Burke et al., using a SAN cell model demonstrated a higher 1996; Taneja et al., 2001; Peters and Gold, 2004; propensity of pacemaker-related arrhythmias in females. Sanjeev and Karpawich, 2005). Sick Sinus Syndrome Conclusion. This study has identified key (SSS) is when action potential (AP) generation is differences in the expression of Ca v1.3, K ir 3.1 and dysfunctional within the SAN, hindering electrical wave propagation to the surrounding atrial muscle. SSS Offprint requests to: Halina Dobrzynski, CTF Building, 46 Grafton Street, symptoms are sinus bradycardia, sinus arrest, and SAN Manchester, M13 9NT, England, UK. e-mail: halina.dobrzynski@ exit block (Rubenstein et al., 1972; Kharche et al., manchester.ac.uk 2017). Sex may be a risk factor for SSS with studies DOI: 10.14670/HH-18-115 reporting a higher prevalence in females, although 1256 A sexy approach to pacemaking underlying mechanisms are unknown (Nowak et al., RNA isolation 2010; Tadros et al., 2014). Since ion channels are responsible for AP generation, sex-specific differences Intact SAN preparations were dissected from the in the expression and function of ion channels are heart as previously described (Dobrzynski et al., 2001). potential major contributors to the higher prevalence of Tissue samples (approximately 1×1 mm) were taken SSS in females. from the centre of the SAN as well as the right atrial free The ‘funny’ current ( If) plays an important role in wall. The samples were taken approximately at the level the slow spontaneous diastolic depolarization in SAN of the leading pacemaker site in the SAN (at the level of cardiomyocytes. The inward calcium (Ca 2+ ) currents: L- the main branch from the crista terminalis). The samples 2+ type and T-type Ca currents ( ICa,L and ICa,T ), are were frozen in liquid N 2. Total RNA isolation was responsible for the upstroke of the SAN AP and also performed on these samples with Qiagen RNeasy micro contribute to the later phase of the diastolic spin columns. 100 ng of total RNA was reversed depolarization. Ca v1.2 and Ca v1.3 are responsible for transcribed with superscript III reverse transcriptase ICa,L and Ca v3.1 is key ion channel responsible for ICa,T (Invitrogen) using random hexamer priming to produce (Mesirca et al., 2015). Various outward potassium (K +) cDNA. currents contribute to repolarisation; the transient outward current ( Ito ) causes the initial rapid qPCR repolarisation phase (Lakatta and Sollott, 2002). Further repolarisation is due to three known delayed rectifier K + Ion channel gene expression was measured through currents: ultra-rapid ( IK,ur ), rapid ( IK,r ) and slow ( IK,s ), quantitative PCR (qPCR) n=12 (n=6 from female SAN generated by: K v1.5, ether-a-go-go-related gene (ERG), and atrial muscle and n=6 from male SAN and atrial and K vLQT1 respectively (Chandler et al., 2009; muscle). All results are given as mean±SEM. Dobrzynski et al., 2013). The muscarinic K + current, Differences were evaluated by t-test with SigmaStat IK,Ach , is composed of the channel subunits: K ir 3.1 and software. Differences were considered significant at the Kir 3.4 (Dobrzynski et al., 2001). Acetylcholine activates level of P<0.05. qPCR was performed using an Applied IK,Ach , which slows spontaneous activity of the SAN, Biosystems 7900HT instrument, with low density thereby decreasing heart rate (Dobrzynski et al., 2001). Taqman array cards (Table 1). Expression levels were Intracellular Ca 2+ also plays an important role in calculated using the ΔCt method. GAPDH was used as a pacemaking and this is achieved through localised Ca 2+ house keeper/reference transcript. release from the sarcoplasmic reticulum (SR) via the With the ΔCt method, the abundance of a transcript type 2 ryanodine receptor (RyR2) (Dobrzynski et al., of interest was normalised to the abundance of the 2013). reference transcript to correct for variations in input This study’s aim was to determine whether a RNA. The ΔCt method allows the abundance of difference existed in intrinsic heart rates between male different transcripts to be roughly compared (as well as and female SAN, and quantify the ion channel molecular the abundance of the transcript of interest in different substrates responsible for functional differences. tissues and age groups). However, the efficiency of the reverse transcription (described above) for different Materials and methods transcripts can vary up to 10× and, therefore, only ≥10× differences in the abundance of different cDNAs Dissection of the SAN from rats for qPCR, histology, (corresponding to different mRNAs) were interpreted as immunohistochemistry and functional experiments differences in the corresponding mRNAs. Data obtained with the ΔCt method are listed in Table 2. Tyrode solution was prepared freshly before dissection. To one litre of molecular water, the following Carbachol and nifedipine was added: 7 g/L sodium chloride, 0.3 g/L potassium chloride, 0.32 g/L magnesium sulphate, 0.19 g/L sodium The rats’ SAN preparations in the recording chamber phosphate, 2.1 g/L hydrogen carbonate, and 2 g/L were continuously perfused with Tyrode solution at a glucose. This solution was mixed with an rate of 10 ml/minute for 30 minutes to allow the tissue to electromagnetic mixer. Oxygen was then bubbled adjust and to record the baseline beating rate in SAN through the solution for 15 minutes to lower the pH to preparations. 0.1 μM of carbachol or 5 μM of nifedipine 7.4. 1.8 ml/L calcium chloride was added at this point. was then run over the preparations for 30 minutes. The Male and female rats weighing 250-300 g were preparations were then washed with normal Tyrode euthanized through exposure to carbon dioxide in a solution for another 30 minutes and the recovery of the rising concentration, followed by dislocation of the neck. beating rate was recorded, resulting in a total recording This method is in compliance with the ethical standards time of 90 minutes per preparation. The extracellular of the University of Manchester and the UK Home potentials were monitored through two stainless steel Office Animals (Scientific 17 Procedures) Act 1986. The needles (JcM health) and the measurements were right atria, containing the SAN, were dissected from the recorded using LabChart software (ADInstruments) as hearts using Tyrode’s solution. described by Morris et al. (2013). This method was 1257 A sexy approach to pacemaking replicated with 5 μM of nifedipine replacing the 0.1 μM the Chart View window of the LabChart software. The of carbachol. The trace recordings of the baseline final
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