Full Text Journal Articles by
Author William Joyce

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sto-3 is expressed in R4BL/R and R8BL/R, male-specific ray neurons in C. elegans.

Vladislav Susoy, William Joseph Joyce, Sahand Jamal Rahi,

MicroPubl Biol (microPublication biology)
[2019, 2019:]

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Hif-1α is not required for the development of cardiac adrenergic control in zebrafish (Danio rerio).

William Joyce, Steve F Perry,

Adrenergic regulation, acting via the sympathetic nervous system, provides a major mechanism to control cardiac function. It has recently been shown that hypoxia inducible factor-1α (Hif-1α) is necessary for normal development of sympathetic innervation and control of cardiac function in the mouse. To investigate whether this may represent a fundamental ... Read more >>

J Exp Zool A Ecol Integr Physiol (Journal of experimental zoology. Part A, Ecological and integrative physiology)
[2021, 335(7):623-631]

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Elevated cortisol lowers thermal tolerance but results in limited cardiac remodelling in rainbow trout (Oncorhynchus mykiss) experiencing chronic social stress.

Brittany Bard, Annette Dodge, William Joyce, Michael Lawrence, Steven J Cooke, Kathleen M Gilmour,

Juvenile rainbow trout (Oncorhynchus mykiss) held in pairs form dominance hierarchies in which subordinate individuals experience chronic social stress accompanied by lowered thermal tolerance (assessed as the critical thermal maximum, CTmax). Here, we tested the hypothesis that chronic elevation of circulating cortisol levels reduces thermal tolerance in subordinate trout. In ... Read more >>

J Exp Biol (The Journal of experimental biology)
[2021, 224(13):]

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Resilience of cardiac performance in Antarctic notothenioid fishes in a warming climate.

Kristin M O'Brien, William Joyce, Elizabeth L Crockett, Michael Axelsson, Stuart Egginton, Anthony P Farrell,

Warming in the region of the Western Antarctic Peninsula is occurring at an unprecedented rate, which may threaten the survival of Antarctic notothenioid fishes. Herein, we review studies characterizing thermal tolerance and cardiac performance in notothenioids - a group that includes both red-blooded species and the white-blooded, haemoglobinless icefishes - ... Read more >>

J Exp Biol (The Journal of experimental biology)
[2021, 224(10):]

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Histamine exerts both direct H2-mediated and indirect catecholaminergic effects on heart rate in pythons.

Simon Nørgaard, William Joyce, Maja Fuhlendorff Jensen, Sanne Enok, Nini Skovgaard, Tobias Wang,

The vertebrate heart is regulated by excitatory adrenergic and inhibitory cholinergic innervations, as well as non-adrenergic non-cholinergic (NANC) factors that may be circulating in the blood or released from the autonomic nerves. As an example of NANC signaling, an increased histaminergic tone, acting through stimulation of H<sub>2</sub> receptors, contributes markedly ... Read more >>

J Comp Physiol B (Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology)
[2021, 191(2):347-355]

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Distinct Neuropeptide-Receptor Modules Regulate a Sex-Specific Behavioral Response to a Pheromone

Douglas Reilly, Emily McGlame, Elke Vandewyer, Annalise Robidoux, Haylea Northcott, William Joyce, Mark Alkema, Robert Gegear, Isabel Beets, Jagan Srinivasan,

Dioecious species are a hallmark of the animal kingdom, with opposing sexes responding differently to identical sensory cues. Here, we study the response of C. elegans’ to the small-molecule pheromone, ascr#8, which elicits opposing behavioral valences in each sex. We identify a novel neuropeptide-neuropeptide receptor (NP/NPR) module that is active ... Read more >>

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How cardiac output is regulated: August Krogh's proto-Guytonian understanding of the importance of venous return.

William Joyce, Tobias Wang,

August Krogh pioneered a view of cardiac output that emphasised the rate of venous return, and stressed the importance of changing the filling of the 'inadequately' supplied heart, instead of changes in heart rate or cardiac inotropy. Krogh, by and large, presented this concept in three manuscripts published in 1912, ... Read more >>

Comp Biochem Physiol A Mol Integr Physiol (Comparative biochemistry and physiology. Part A, Molecular & integrative physiology)
[2021, 253:110861]

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Regulation of splenic contraction persists as a vestigial trait in white-blooded Antarctic fishes.

William Joyce, Michael Axelsson,

In fishes, the spleen can function as an important reservoir for red blood cells (RBCs), which, following splenic contraction, may be released into the circulation to increase haematocrit during energy-demanding activities. This trait is particularly pronounced in red-blooded Antarctic fishes in which the spleen can sequester a large proportion of ... Read more >>

J Fish Biol (Journal of fish biology)
[2021, 98(1):287-291]

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Response to 'What makes the blood go around?'

William Joyce, Tobias Wang,

J Exp Biol (The Journal of experimental biology)
[2020, 223(Pt 8):]

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Hypoxia inducible factor-1α knockout does not impair acute thermal tolerance or heat hardening in zebrafish.

William Joyce, Steve F Perry,

The rapid increase in critical thermal maximum (CT<sub>max</sub>) in fish (or other animals) previously exposed to critically high temperature is termed 'heat hardening', which likely represents a key strategy to cope with increasingly extreme environments. The physiological mechanisms that determine acute thermal tolerance, and the underlying pathways facilitating heat hardening, ... Read more >>

Biol Lett (Biology letters)
[2020, 16(7):20200292]

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Response to 'Flow versus pressure?'

William Joyce, Tobias Wang,

J Exp Biol (The Journal of experimental biology)
[2020, 223(Pt 13):]

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What determines systemic blood flow in vertebrates?

William Joyce, Tobias Wang,

In the 1950s, Arthur C. Guyton removed the heart from its pedestal in cardiovascular physiology by arguing that cardiac output is primarily regulated by the peripheral vasculature. This is counterintuitive, as modulating heart rate would appear to be the most obvious means of regulating cardiac output. In this Review, we ... Read more >>

J Exp Biol (The Journal of experimental biology)
[2020, 223(Pt 4):]

Cited: 2 times

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Smooth Muscle in Cardiac Chambers is Common in Turtles and Extensive in the Emydid Turtle, Trachemys scripta.

William Joyce, Dane A Crossley, Tobias Wang, Bjarke Jensen,

A prominent layer of smooth muscle lining the luminal side of the atria of freshwater turtles (Emydidae) was described more than a century ago. We recently demonstrated that this smooth muscle provides a previously unrecognized mechanism to change cardiac output in the emydid red-eared slider (Trachemys scripta) that possibly contributes ... Read more >>

Anat Rec (Hoboken) (Anatomical record (Hoboken, N.J. : 2007))
[2020, 303(5):1327-1336]

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Low incidence of atrial septal defects in nonmammalian vertebrates.

Bjarke Jensen, William Joyce, Martina Gregorovicova, David Sedmera, Tobias Wang, Vincent M Christoffels,

The atrial septum enables efficient oxygen transport by separating the systemic and pulmonary venous blood returning to the heart. Only in placental mammals will the atrial septum form by the coming-together of the septum primum and the septum secundum. In up to one of four placental mammals, this complex morphogenesis ... Read more >>

Evol Dev (Evolution & development)
[2020, 22(3):241-256]

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Weighing the evidence for using vascular conductance, not resistance, in comparative cardiovascular physiology.

William Joyce, Daniel W White, Peter B Raven, Tobias Wang,

Vascular resistance and conductance are reciprocal indices of vascular tone that are often assumed to be interchangeable. However, in most animals in vivo, blood flow (i.e. cardiac output) typically varies much more than arterial blood pressure. When blood flow changes at a constant pressure, the relationship between conductance and blood ... Read more >>

J Exp Biol (The Journal of experimental biology)
[2019, 222(Pt 6):]

Cited: 1 time

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Contraction of atrial smooth muscle reduces cardiac output in perfused turtle hearts.

William Joyce, Michael Axelsson, Tobias Wang,

Unusual undulations in resting tension (tonus waves) were described in isolated atria from freshwater turtles more than a century ago. These tonus waves were soon after married with the histological demonstration of a rich layer of smooth muscle on the luminal side of the atrial wall. Research thereafter waned and ... Read more >>

J Exp Biol (The Journal of experimental biology)
[2019, 222(Pt 6):]

Cited: 1 time

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The effects of endogenous and exogenous catecholamines on hypoxic cardiac performance in red-bellied piranhas.

William Joyce, Catherine J A Williams, Sofie Iversen, Per Guldhammer Henriksen, Mark Bayley, Tobias Wang,

Catecholamines protect the fish heart during hypoxia. However, the humoral adrenergic stress response may only be invoked in extremis. We investigated the hypothesis that endogenous (e.g., neuronal) myocardial catecholamines may also impact cardiac performance during hypoxia in a hypoxia-tolerant tropical fish, the red-bellied piranha (Pygocentrus nattereri). First, we measured endogenous ... Read more >>

J Exp Zool A Ecol Integr Physiol (Journal of experimental zoology. Part A, Ecological and integrative physiology)
[2019, 331(1):27-37]

Cited: 1 time

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Adrenergic and adenosinergic regulation of the cardiovascular system in an Antarctic icefish: Insight into central and peripheral determinants of cardiac output.

William Joyce, Stuart Egginton, Anthony P Farrell, Michael Axelsson,

Icefishes characteristically lack the oxygen-binding protein haemoglobin and therefore are especially reliant on cardiovascular regulation to augment oxygen transport when oxygen demand increases, such as during activity and warming. Using both in vivo and in vitro experiments, we evaluated the roles for adrenaline and adenosine, two well-established cardio- and vasoactive ... Read more >>

Comp Biochem Physiol A Mol Integr Physiol (Comparative biochemistry and physiology. Part A, Molecular & integrative physiology)
[2019, 230:28-38]

Cited: 1 time

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The effects of thermal acclimation on cardio-respiratory performance in an Antarctic fish (Notothenia coriiceps).

William Joyce, Michael Axelsson, Stuart Egginton, Anthony P Farrell, Elizabeth L Crockett, Kristin M O'Brien,

The Southern Ocean has experienced stable, cold temperatures for over 10 million years, yet particular regions are currently undergoing rapid warming. To investigate the impacts of warming on cardiovascular oxygen transport, we compared the cardio-respiratory performance in an Antarctic notothenioid (Notothenia coriiceps) that was maintained at 0 or 5°C for ... Read more >>

Conserv Physiol (Conservation physiology)
[2018, 6(1):coy069]

Cited: 3 times

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Maximum heart rate does not limit cardiac output at rest or during exercise in the American alligator ( Alligator mississippiensis).

William Joyce, Ruth M Elsey, Tobias Wang, Dane A Crossley,

In most vertebrates, increases in cardiac output result from increases in heart rate (fH) with little or no change in stroke volume (Vs), and maximum cardiac output (Q̇) is typically attained at or close to maximum fH. We therefore tested the hypothesis that increasing maximum fH may increase maximum Q̇. ... Read more >>

Am J Physiol Regul Integr Comp Physiol (American journal of physiology. Regulatory, integrative and comparative physiology)
[2018, 315(2):R296-R302]

Cited: 4 times

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The electrocardiogram of vertebrates: Evolutionary changes from ectothermy to endothermy.

Bastiaan J D Boukens, Ditte L Kristensen, Renato Filogonio, Laura B T Carreira, Marina R Sartori, Augusto S Abe, Shannon Currie, William Joyce, Justin Conner, Tobias Opthof, Dane A Crossley, Tobias Wang, Bjarke Jensen,

The electrocardiogram (ECG) reveals that heart chamber activation and repolarization are much faster in mammals and birds compared to ectothermic vertebrates of similar size. Temperature, however, affects electrophysiology of the heart and most data from ectotherms are determined at body temperatures lower than those of mammals and birds. The present ... Read more >>

Prog Biophys Mol Biol (Progress in biophysics and molecular biology)
[2019, 144:16-29]

Cited: 6 times

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Too frail for surgery? A frailty index in major colorectal surgery.

Geoff Crozier-Shaw, William P Joyce,

<h4>Background</h4>Frailty is defined as increased vulnerability from accumulating morbidities in multiple organ systems. Evidence suggests frailty indices predict surgical outcomes in elderly patients. We assessed the validity of a frailty index in predicting post-operative outcomes in major colorectal surgery.<h4>Methods</h4>A retrospective review of a prospective database was studied. Patients aged less ... Read more >>

ANZ J Surg (ANZ journal of surgery)
[2018, 88(12):1302-1305]

Cited: 1 time

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The effects of embryonic hypoxic programming on cardiovascular function and autonomic regulation in the American alligator (Alligator mississippiensis) at rest and during swimming.

William Joyce, Tiffany E Miller, Ruth M Elsey, Tobias Wang, Dane A Crossley,

Reptilian embryos naturally experience fluctuating oxygen levels in ovo, and developmental hypoxia has been established to have long-term impacts on cardiovascular function in vertebrates. In the present study, we investigated the impact of developmental 21% (normoxia) and 10% O<sub>2</sub> (hypoxia) on juvenile (4-year-old) American alligator cardiovascular function in animals at ... Read more >>

J Comp Physiol B (Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology)
[2018, 188(6):967-976]

Cited: 4 times

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Exploring nature's natural knockouts: in vivo cardiorespiratory performance of Antarctic fishes during acute warming.

William Joyce, Stuart Egginton, Anthony P Farrell, Elizabeth L Crockett, Kristin M O'Brien, Michael Axelsson,

We tested the hypothesis that blackfin icefish (<i>Chaenocephalus aceratus</i>), one of the six species in the family Channichthyidae (the icefishes) that do not express haemoglobin and myoglobin, lack regulatory cardiovascular flexibility during acute warming and activity. The experimental protocols were designed to optimize the surgical protocol and minimize stress. First, ... Read more >>

J Exp Biol (The Journal of experimental biology)
[2018, 221(Pt 15):]

Cited: 7 times

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Colo-ureteric fistula: a rare complication in colorectal surgery.

Geoff Crozier-Shaw, William P Joyce,

ANZ J Surg (ANZ journal of surgery)
[2019, 89(7-8):E327-E328]

Cited: 0 times

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