1
|
Yakovleva O, Albova P, Sitdikova G. The Role of Nitric Oxide in Regulation of Exocytosis and Endocytosis of Synaptic Vesicles in Motor Nerve Endings of Mice in Alloxan Model of Diabetes Mellitus. BIONANOSCIENCE 2022. [DOI: 10.1007/s12668-022-00976-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
2
|
Bukharaeva E, Shakirzyanova A, Khuzakhmetova V, Sitdikova G, Giniatullin R. Homocysteine aggravates ROS-induced depression of transmitter release from motor nerve terminals: potential mechanism of peripheral impairment in motor neuron diseases associated with hyperhomocysteinemia. Front Cell Neurosci 2015; 9:391. [PMID: 26500495 PMCID: PMC4594498 DOI: 10.3389/fncel.2015.00391] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 09/18/2015] [Indexed: 12/13/2022] Open
Abstract
Homocysteine (HCY) is a pro-inflammatory sulphur-containing redox active endogenous amino acid, which concentration increases in neurodegenerative disorders including amyotrophic lateral sclerosis (ALS). A widely held view suggests that HCY could contribute to neurodegeneration via promotion of oxidative stress. However, the action of HCY on motor nerve terminals has not been investigated so far. We previously reported that oxidative stress inhibited synaptic transmission at the neuromuscular junction, targeting primarily the motor nerve terminals. In the current study, we investigated the effect of HCY on oxidative stress-induced impairment of transmitter release at the mouse diaphragm muscle. The mild oxidant H2O2 decreased the intensity of spontaneous quantum release from nerve terminals (measured as the frequency of miniature endplate potentials, MEPPs) without changes in the amplitude of MEPPs, indicating a presynaptic effect. Pre-treatment with HCY for 2 h only slightly affected both amplitude and frequency of MEPPs but increased the inhibitory potency of H2O2 almost two fold. As HCY can activate certain subtypes of glutamate N-methyl D-aspartate (NMDA) receptors we tested the role of NMDA receptors in the sensitizing action of HCY. Remarkably, the selective blocker of NMDA receptors, AP-5 completely removed the sensitizing effect of HCY on the H2O2-induced presynaptic depressant effect. Thus, at the mammalian neuromuscular junction HCY largely increases the inhibitory effect of oxidative stress on transmitter release, via NMDA receptors activation. This combined effect of HCY and local oxidative stress can specifically contribute to the damage of presynaptic terminals in neurodegenerative motoneuron diseases, including ALS.
Collapse
Affiliation(s)
- Ellya Bukharaeva
- Department of Physiology, Kazan Federal UniversityKazan, Russia
- A. I. Virtanen Institute for Molecular Sciences, Department of Neurobiology, University of Eastern FinlandKuopio, Finland
- Kazan Institute of Biochemistry and BiophysicsKazan, Russia
| | - Anastasia Shakirzyanova
- Department of Physiology, Kazan Federal UniversityKazan, Russia
- A. I. Virtanen Institute for Molecular Sciences, Department of Neurobiology, University of Eastern FinlandKuopio, Finland
| | - Venera Khuzakhmetova
- Department of Physiology, Kazan Federal UniversityKazan, Russia
- Kazan Institute of Biochemistry and BiophysicsKazan, Russia
| | - Guzel Sitdikova
- A. I. Virtanen Institute for Molecular Sciences, Department of Neurobiology, University of Eastern FinlandKuopio, Finland
| | - Rashid Giniatullin
- Department of Physiology, Kazan Federal UniversityKazan, Russia
- A. I. Virtanen Institute for Molecular Sciences, Department of Neurobiology, University of Eastern FinlandKuopio, Finland
| |
Collapse
|
3
|
Gerasimova E, Lebedeva J, Yakovlev A, Zefirov A, Giniatullin R, Sitdikova G. Mechanisms of hydrogen sulfide (H2S) action on synaptic transmission at the mouse neuromuscular junction. Neuroscience 2015; 303:577-85. [PMID: 26192092 DOI: 10.1016/j.neuroscience.2015.07.036] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 06/02/2015] [Accepted: 07/11/2015] [Indexed: 11/29/2022]
Abstract
Hydrogen sulfide (H2S) is a widespread gasotransmitter also known as a powerful neuroprotective agent in the central nervous system. However, the action of H2S in peripheral synapses is much less studied. In the current project we studied the modulatory effects of the H2S donor sodium hydrosulfide (NaHS) on synaptic transmission in the mouse neuromuscular junction using microelectrode technique. Using focal recordings of presynaptic response and evoked transmitter release we have shown that NaHS (300 μM) increased evoked end-plate currents (EPCs) without changes of presynaptic waveforms which indicated the absence of NaHS effects on sodium and potassium currents of motor nerve endings. Using intracellular recordings it was shown that NaHS increased the frequency of miniature end-plate potentials (MEPPs) without changing their amplitudes indicating a pure presynaptic effect. Furthermore, NaHS increased the amplitude of end-plate potentials (EPPs) without influencing the resting membrane potential of muscle fibers. L-cysteine, a substrate of H2S synthesis induced, similar to NaHS, an increase of EPC amplitudes whereas inhibitors of H2S synthesis (β-cyano-L-alanine and aminooxyacetic acid) had the opposite effect. Inhibition of adenylate cyclase using MDL 12,330A hydrochloride (MDL 12,330A) or elevation of cAMP level with 8-(4-chlorophenylthio)-adenosine 3',5'-cyclic monophosphate (pCPT-cAMP) completely prevented the facilitatory action of NaHS indicating involvement of the cAMP signaling cascade. The facilitatory effect of NaHS was significantly diminished when intracellular calcium (Ca(2+)) was buffered by 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid tetrakis acetoxymethyl ester (BAPTA-AM) and ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid acetoxymethyl ester (EGTA-AM). Activation of ryanodine receptors by caffeine or ryanodine increased acetylcholine release and prevented further action of NaHS on transmitter release, likely due to an occlusion effect. Inhibition of ryanodine receptors by ryanodine or dantrolene also reduced the action of NaHS on EPC amplitudes. Our results indicate that in mammalian neuromuscular synapses endogenously produced H2S increases spontaneously and evoked quantal transmitter release from motor nerve endings without changing the response of nerve endings. The presynaptic effect of H2S appears mediated by intracellular Ca(2+) and cAMP signaling and involves presynaptic ryanodine receptors.
Collapse
Affiliation(s)
- E Gerasimova
- Department of Human and Animals Physiology, Institute of Fundamental Biology and Medicine, Kazan Federal University, Kremlevskaya Street 18, Kazan 420008, Russia.
| | - J Lebedeva
- Department of Human and Animals Physiology, Institute of Fundamental Biology and Medicine, Kazan Federal University, Kremlevskaya Street 18, Kazan 420008, Russia.
| | - A Yakovlev
- Department of Human and Animals Physiology, Institute of Fundamental Biology and Medicine, Kazan Federal University, Kremlevskaya Street 18, Kazan 420008, Russia.
| | - A Zefirov
- Department of Normal Physiology, Kazan Medical University, Butlerova Street 49, Kazan 420042, Russia.
| | - R Giniatullin
- Open Laboratory of Neurobiology, Institute of Fundamental Biology and Medicine, Kazan Federal University, Kremlevskaya Street 18, Kazan 420008, Russia; Cell Biology Laboratory, Department of Neurobiology, A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Neulaniementie 2, Kuopio 70211, Finland.
| | - G Sitdikova
- Department of Human and Animals Physiology, Institute of Fundamental Biology and Medicine, Kazan Federal University, Kremlevskaya Street 18, Kazan 420008, Russia.
| |
Collapse
|