Afferent neural activity from pseudobranch of teleosts. Effects of Po2, pH, osmotic pressure and Na+ ions

Laurent, Pierre; Rouzeau, Jean-Denis

doi:10.1016/0034-5687(72)90037-0

Cited by 72 publications

(19 citation statements)

References 23 publications

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“…Although the physiological function of the pseudobranch has long been debated (Laurent and Rouzeau, 1972;Laurent and Dunel-Erb, 1984;Bridges et al, 1998), there is accumulating evidence that one of its roles is to assist the O 2 -concentrating mechanisms occurring within the choroid rete of the eye of certain marine teleosts. In these fish, the retina is thick and non-vascularized, thereby impeding the delivery of O 2 to the retinal tissue.…”

Section: The Pseudobranchmentioning

confidence: 99%

Carbonic anhydrase and acid–base regulation in fish

Gilmour

Perry

2009

Journal of Experimental Biology

179

131

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SummaryCarbonic anhydrase (CA) is the zinc metalloenzyme that catalyses the reversible reactions of CO 2 with water. CA plays a crucial role in systemic acid-base regulation in fish by providing acid-base equivalents for exchange with the environment. Unlike airbreathing vertebrates, which frequently utilize alterations of breathing (respiratory compensation) to regulate acid-base status, acid-base balance in fish relies almost entirely upon the direct exchange of acid-base equivalents with the environment (metabolic compensation). The gill is the critical site of metabolic compensation, with the kidney playing a supporting role. At the gill, cytosolic CA catalyses the hydration of CO 2 to H + and HCO 3 -for export to the water. In the kidney, cytosolic and membranebound CA isoforms have been implicated in HCO 3 -reabsorption and urine acidification. In this review, the CA isoforms that have been identified to date in fish will be discussed together with their tissue localizations and roles in systemic acid-base regulation.

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Section: The Pseudobranchmentioning

confidence: 99%

Carbonic anhydrase and acid–base regulation in fish

Gilmour

Perry

2009

Journal of Experimental Biology

179

131

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“…6B; Laurent and Dunel-Erb, 1984;Quinn et al, 2003;Jonz and Nurse, 2006). Early studies investigating the function of the pseudobranch suggested that it may act as a gland, a sensory organ involved in O 2 chemoreception, or take part in osmoregulation (Laurent and Rouzeau, 1972;Laurent and Dunel-Erb, 1984). It was recently concluded, however, that the hypoxic release of catecholamines from chromaffin cells mediated by O 2 chemoreceptors did not involve the pseudobranch in trout (Reid and Perry, 2003), and only one or two 5-HT-containing cells resembling O 2 -sensitive gill NECs were found in each pseudobranch filament in zebrafish (Jonz and Nurse, 2003).…”

Section: The Pseudobranchmentioning

confidence: 99%

“…In zebrafish, PBCs are densely packed within the fused lamellae and are innervated by a rich network of nerve fibres that arise from supportive filaments . There is evidence that the teleost pseudobranch receives afferent innervation (Laurent and Rouzeau, 1972;Laurent and Dunel-Erb, 1984), but similar nerve fibres in zebrafish are immunopositive for the synaptic vesicle protein SV2 (Jonz and Nurse, 2003), suggesting a neurosecretory or efferent role of these fibres. Moreover, since innervation of PBCs occurs apically, rather than basolaterally (Laurent and Dunel-Erb, 1984;Jonz and Nurse, 2006), the physiological significance of these cells would appear to be limited to internally oriented functions that may take place between the basolateral membrane and the vasculature, such as hormone secretion or chemical sensing of the blood.…”

Section: The Pseudobranchmentioning

confidence: 99%

“…zn-12) (see Trevarrow et al, 1990) allows labelling of the entire branchial nervous system. Several pioneering histological and ultrastructural studies have established the cellular morphology and innervation of the branchial structures in fish, particularly those of Pierre Laurent and colleagues (Laurent and Rouzeau, 1972;Laurent and Dunel-Erb, 1984;Dunel-Erb et al, 1982;Dunel-Erb et al, 1989;Bailly et al, 1989;Bailly et al, 1992). However, as it is not the goal of this Commentary, we will not attempt to review this extensive body of work.…”

Section: Introductionmentioning

confidence: 99%

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New developments on gill innervation: insights from a model vertebrate

Jonz

Nurse

2008

Journal of Experimental Biology

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SummaryThe fish gill is a highly specialized and complex organ that performs a variety of important physiological functions. In this article, we briefly review the innervation of important structures of the branchial region, such as the gill filaments, respiratory lamellae and pseudobranch, and discuss the physiological significance of this innervation within the context of homeostatic functions of the gill, such as oxygen sensing and ion regulation. Studies in zebrafish utilizing techniques of confocal microscopy and immunolabelling, with specific antibodies against neuronal markers, have recently led to the characterization of innervation patterns in the gills not attained with traditional techniques of histochemistry and electron microscopy. We will discuss the association of putative sensory nerve fibres with O 2 -chemoreceptive neuroepithelial cells and the implications of dual sensory pathways for cardiorespiratory and vascular control. In addition, the idea of the neural control of ion regulation in the gill based on the apparent innervation of mitochondria-rich cells, and the role of innervation in the pseudobranch, will be presented.

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“…It is not known whether the afferent fibres of these receptors are myelinated or non-myelinated, although several studies on beroreceptors in ectothermic vertebrates have described what appear to be myelinated afferent fibres. (Fedele, 1943;Rogers, 1966; Abraham, 1969;Laurent & Rouzeau, 1972), and most comparisons of baroreflexes in ectotherms have been made with mammalian baroreflexes which are mediated predominantly by myelinated baroreceptors (Kirchheim, 1976;Jones & Milsom, 1982;West & Van Vliet, 1983;Bagshaw, 1985). Protocolfor recording upper-airway afferent activity.…”

Section: Introductionmentioning

confidence: 99%

Responses to circulatory pressures, and conduction velocity, of pulmocutaneous baroreceptors in Bufo marinus.

Vliet

West

1987

The Journal of Physiology

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SUMMARY1. Baroreceptor activity was recorded within the recurrent laryngeal branch of the toad vagus in forty-four preparations. The receptive fields of the receptors were located in the pulmocutaneous artery (p.c.a.), generally within 5 mm of its separation from the truncus. However, the most easily recorded afferents in this nerve were mechanoreceptors which responded to punctate stimulation of the lip of the glottis.2. The conduction velocities of p.c.a. baroreceptor and mechanoreceptive glottal afferents recorded in the recurrent laryngeal nerve ranged from 0 3-07 (0-5+041) m s-1 and 2-2-14-0 (6 8+0 8) m s-1 respectively, which suggests that baroreceptor afferent fibres are non-myelinated and that glottal afferent fibres are myelinated.3. The p.c.a. baroreceptor discharge was largely confined to a period of systole in which systemic and p.c.a. arterial pressure profiles were identical. The maximum discharge frequency, number of spikes per cycle, and the duration of discharge increased, and the discharge latency decreased, as p.c.a. pressures were elevated. The latency of the discharge was pronounced at low p.c.a. pressures, and could be partially accounted for by the conduction time of the baroreceptor afferents to the electrodes (up to 100 ms).4. Carotid and aortic arterial baroreceptor and pharyngeal afferents were recorded in two pharyngeal branches of the vagus nerve which were closely associated with the carotid and aortic arterial arches.5. It is suggested that baroreceptor populations with their receptive fields in the third-(carotid) and sixth-(p.c.a. or pulmonary) arch arteries should be considered homologous in anurans and mammals, but that those of the fourth-(aorta) arch artery should not, since the vagal branches in which their afferents are carried do not appear to be equivalent in anurans and mammals.

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Afferent neural activity from pseudobranch of teleosts. Effects of Po2, pH, osmotic pressure and Na+ ions

Cited by 72 publications

References 23 publications

Carbonic anhydrase and acid–base regulation in fish

Carbonic anhydrase and acid–base regulation in fish

New developments on gill innervation: insights from a model vertebrate

Responses to circulatory pressures, and conduction velocity, of pulmocutaneous baroreceptors in Bufo marinus.

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