The Role of GABA in the Peripheral Nervous System

Tanaka, Chikako; Taniyama, Kohtaro

doi:10.1007/978-3-642-76915-3_1

Cited by 5 publications

(2 citation statements)

References 66 publications

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“…An interesting finding was the decrease in NA concentration (more than 50% reduction after ALLO 6 µ m incubation). The paravertebral sympathetic ganglia express GABA receptors and GABA synthetic enzymes 124,125 that may regulate ganglionic transmission. GABA receptor stimulation within the SMG could exert an inhibitory effect involving membrane hyperpolarization, thus diminishing NA secretion 126,127 .…”

Section: Discussionmentioning

confidence: 99%

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Superior mesenteric ganglion neural modulation of ovarian angiogenesis, apoptosis and proliferation by the neuroactive steroid allopregnanolone

Cáceres

Arboccó

Cardone

et al. 2021

J Neuroendocrinology

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Allopregnanolone (ALLO), a potent neuroactive steroid, is synthesized and active in the peripheral nervous system. Previous studies have shown that ALLO participates in the central regulation of reproduction with effects on ovarian physiology, although there is little evidence for its ability to modulate peripheral tissues. The present study aimed to determine whether ALLO, administered to an ex vivo system that comprises the superior mesenteric ganglion (SMG), the ovarian nervous plexus (ONP) and the ovary (O), or to the denervated ovary (DO), was able to modify ovarian apoptosis, proliferation and angiogenesis. For this purpose, the SMG‐ONP‐O system and DO were incubated during 120 min at 37°C, in the presence of two ALLO doses (0.06 µm and 6 µm). The intrinsic and extrinsic pathways of apoptosis were analyzed. Incubation of the SMG‐ONP‐O system with ALLO 0.06 µm led to an increase in the BAX/BCL‐2 ratio and a reduction of FAS‐L mRNA levels. ALLO 6 µm induced a decrease of FAS‐L levels. Incubation of DO with ALLO 0.06 µm reduced FAS‐L, whereas ALLO 6 µm significantly increased it. Cyclin D1 mRNA was measured to evaluate proliferation. Treatment with ALLO 6 µm increased proliferation in both SMG‐ONP‐O and DO. ALLO 0.06 µm produced an increase of Cyclin D1 in DO only. Administration of either ALLO dose led to a higher ovarian expression of vascular endothelial growth factor in the SMG‐ONP‐O system, but a lower one in the DO system. ALLO 6 µm induced ovarian sensitization to GABA by increasing GABAA receptor expression. In conclusion, ALLO participates in the peripheral neural modulation of ovarian physiology. It can also interact directly with the ovarian tissue, modulating key mechanisms involved in normal and pathological processes in a dose‐dependent manner.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%