Peripheral oxytocin restores light touch and nociceptor sensory afferents towards normal after nerve injury
Oxytocin reduces primary sensory afferent excitability and produces analgesia in part through a peripheral mechanism, yet its actions on physiologically characterized, mechanically sensitive afferents in normal and neuropathic conditions are unknown. We recorded intracellularly from L4 dorsal root g...
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| Published in | Pain (Amsterdam) Vol. 160; no. 5; pp. 1146 - 1155 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
Wolters Kluwer
01.05.2019
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| Online Access | Get full text |
| ISSN | 0304-3959 1872-6623 1872-6623 |
| DOI | 10.1097/j.pain.0000000000001495 |
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| Abstract | Oxytocin reduces primary sensory afferent excitability and produces analgesia in part through a peripheral mechanism, yet its actions on physiologically characterized, mechanically sensitive afferents in normal and neuropathic conditions are unknown. We recorded intracellularly from L4 dorsal root ganglion neurons characterized as low-threshold mechanoreceptors (LTMRs) or high-threshold mechanoreceptors (HTMRs) in female rats 1 week after L5 partial spinal nerve injury or sham control (n = 24 rats/group) before, during, and after ganglionic perfusion with oxytocin, 1 nM. Nerve injury desensitized and hyperpolarized LTMRs (membrane potential [Em] was −63 ± 1.8 mV in sham vs −76 ± 1.4 mV in nerve injury;
P
< 0.001), and sensitized HTMRs without affecting Em. In nerve-injured rats, oxytocin depolarized LTMRs towards normal (Em = −69 ± 1.9 mV) and, in 6 of 21 neurons, resulted in spontaneous action potentials. By contrast, oxytocin hyperpolarized HTMRs (Em = −68 ± 2.7 mV before vs −80 ± 3.2 mV during oxytocin exposure;
P
< 0.01). These effects were reversed after removal of oxytocin, and oxytocin had minimal effects in neurons from sham surgery animals. Sensory afferent neurons immunopositive for the vasopressin 1a receptor were larger (34 ± 6.3 μm, range 16-57 μm) than immunonegative neurons (26 ± 3.4 μm, range 15-43 μm;
P
< 0.005). These data replicate findings that neuropathic injury desensitizes LTMRs while sensitizing HTMRs and show rapid and divergent oxytocin effects on these afferent subtypes towards normal, potentially rebalancing input to the central nervous system. Vasopressin 1a receptors are present on medium to large diameter afferent neurons and could represent oxytocin's target. |
|---|---|
| AbstractList | Oxytocin reduces primary sensory afferent excitability and produces analgesia in part through a peripheral mechanism, yet its actions on physiologically characterized, mechanically sensitive afferents in normal and neuropathic conditions are unknown. We recorded intracellularly from L4 dorsal root ganglion neurons characterized as low-threshold mechanoreceptors (LTMRs) or high-threshold mechanoreceptors (HTMRs) in female rats 1 week after L5 partial spinal nerve injury or sham control (n = 24 rats/group) before, during, and after ganglionic perfusion with oxytocin, 1 nM. Nerve injury desensitized and hyperpolarized LTMRs (membrane potential [Em] was −63 ± 1.8 mV in sham vs −76 ± 1.4 mV in nerve injury;
P
< 0.001), and sensitized HTMRs without affecting Em. In nerve-injured rats, oxytocin depolarized LTMRs towards normal (Em = −69 ± 1.9 mV) and, in 6 of 21 neurons, resulted in spontaneous action potentials. By contrast, oxytocin hyperpolarized HTMRs (Em = −68 ± 2.7 mV before vs −80 ± 3.2 mV during oxytocin exposure;
P
< 0.01). These effects were reversed after removal of oxytocin, and oxytocin had minimal effects in neurons from sham surgery animals. Sensory afferent neurons immunopositive for the vasopressin 1a receptor were larger (34 ± 6.3 μm, range 16-57 μm) than immunonegative neurons (26 ± 3.4 μm, range 15-43 μm;
P
< 0.005). These data replicate findings that neuropathic injury desensitizes LTMRs while sensitizing HTMRs and show rapid and divergent oxytocin effects on these afferent subtypes towards normal, potentially rebalancing input to the central nervous system. Vasopressin 1a receptors are present on medium to large diameter afferent neurons and could represent oxytocin's target. Oxytocin reduces primary sensory afferent excitability and produces analgesia in part through a peripheral mechanism, yet its actions on physiologically characterized, mechanically sensitive afferents in normal and neuropathic conditions are unknown. We recorded intracellularly from L4 dorsal root ganglion neurons characterized as low-threshold mechanoreceptors (LTMRs) or high-threshold mechanoreceptors (HTMRs) in female rats 1 week after L5 partial spinal nerve injury or sham control (n = 24 rats/group) before, during, and after ganglionic perfusion with oxytocin, 1 nM. Nerve injury desensitized and hyperpolarized LTMRs (membrane potential [Em] was -63 ± 1.8 mV in sham vs -76 ± 1.4 mV in nerve injury; P < 0.001), and sensitized HTMRs without affecting Em. In nerve-injured rats, oxytocin depolarized LTMRs towards normal (Em = -69 ± 1.9 mV) and, in 6 of 21 neurons, resulted in spontaneous action potentials. By contrast, oxytocin hyperpolarized HTMRs (Em = -68 ± 2.7 mV before vs -80 ± 3.2 mV during oxytocin exposure; P < 0.01). These effects were reversed after removal of oxytocin, and oxytocin had minimal effects in neurons from sham surgery animals. Sensory afferent neurons immunopositive for the vasopressin 1a receptor were larger (34 ± 6.3 μm, range 16-57 μm) than immunonegative neurons (26 ± 3.4 μm, range 15-43 μm; P < 0.005). These data replicate findings that neuropathic injury desensitizes LTMRs while sensitizing HTMRs and show rapid and divergent oxytocin effects on these afferent subtypes towards normal, potentially rebalancing input to the central nervous system. Vasopressin 1a receptors are present on medium to large diameter afferent neurons and could represent oxytocin's target.Oxytocin reduces primary sensory afferent excitability and produces analgesia in part through a peripheral mechanism, yet its actions on physiologically characterized, mechanically sensitive afferents in normal and neuropathic conditions are unknown. We recorded intracellularly from L4 dorsal root ganglion neurons characterized as low-threshold mechanoreceptors (LTMRs) or high-threshold mechanoreceptors (HTMRs) in female rats 1 week after L5 partial spinal nerve injury or sham control (n = 24 rats/group) before, during, and after ganglionic perfusion with oxytocin, 1 nM. Nerve injury desensitized and hyperpolarized LTMRs (membrane potential [Em] was -63 ± 1.8 mV in sham vs -76 ± 1.4 mV in nerve injury; P < 0.001), and sensitized HTMRs without affecting Em. In nerve-injured rats, oxytocin depolarized LTMRs towards normal (Em = -69 ± 1.9 mV) and, in 6 of 21 neurons, resulted in spontaneous action potentials. By contrast, oxytocin hyperpolarized HTMRs (Em = -68 ± 2.7 mV before vs -80 ± 3.2 mV during oxytocin exposure; P < 0.01). These effects were reversed after removal of oxytocin, and oxytocin had minimal effects in neurons from sham surgery animals. Sensory afferent neurons immunopositive for the vasopressin 1a receptor were larger (34 ± 6.3 μm, range 16-57 μm) than immunonegative neurons (26 ± 3.4 μm, range 15-43 μm; P < 0.005). These data replicate findings that neuropathic injury desensitizes LTMRs while sensitizing HTMRs and show rapid and divergent oxytocin effects on these afferent subtypes towards normal, potentially rebalancing input to the central nervous system. Vasopressin 1a receptors are present on medium to large diameter afferent neurons and could represent oxytocin's target. Oxytocin reduces primary sensory afferent excitability and produces analgesia in part through a peripheral mechanism, yet its actions on physiologically characterized, mechanically sensitive afferents in normal and neuropathic conditions are unknown. We recorded intracellularly from L4 dorsal root ganglion neurons characterized as low-threshold mechanoreceptors (LTMRs) or high-threshold mechanoreceptors (HTMRs) in female rats 1 week after L5 partial spinal nerve injury or sham control (n = 24 rats/group) before, during, and after ganglionic perfusion with oxytocin, 1 nM. Nerve injury desensitized and hyperpolarized LTMRs (membrane potential [Em] was -63 ± 1.8 mV in sham vs -76 ± 1.4 mV in nerve injury; P < 0.001), and sensitized HTMRs without affecting Em. In nerve-injured rats, oxytocin depolarized LTMRs towards normal (Em = -69 ± 1.9 mV) and, in 6 of 21 neurons, resulted in spontaneous action potentials. By contrast, oxytocin hyperpolarized HTMRs (Em = -68 ± 2.7 mV before vs -80 ± 3.2 mV during oxytocin exposure; P < 0.01). These effects were reversed after removal of oxytocin, and oxytocin had minimal effects in neurons from sham surgery animals. Sensory afferent neurons immunopositive for the vasopressin 1a receptor were larger (34 ± 6.3 μm, range 16-57 μm) than immunonegative neurons (26 ± 3.4 μm, range 15-43 μm; P < 0.005). These data replicate findings that neuropathic injury desensitizes LTMRs while sensitizing HTMRs and show rapid and divergent oxytocin effects on these afferent subtypes towards normal, potentially rebalancing input to the central nervous system. Vasopressin 1a receptors are present on medium to large diameter afferent neurons and could represent oxytocin's target. |
| Author | Boada, M. Danilo Eisenach, James C. Gutierrez, Silvia |
| AuthorAffiliation | Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, United States |
| AuthorAffiliation_xml | – name: Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, United States |
| Author_xml | – sequence: 1 givenname: M. Danilo surname: Boada fullname: Boada, M. Danilo organization: Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, United States – sequence: 2 givenname: Silvia surname: Gutierrez fullname: Gutierrez, Silvia – sequence: 3 givenname: James C. surname: Eisenach fullname: Eisenach, James C. |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/30920428$$D View this record in MEDLINE/PubMed |
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