A study of ion binding in the hemolymph of Periplaneta americana

Weidler, Donald J.; Sieck, Gary C.

doi:10.1016/0300-9629(77)90433-9

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…The concentration of Mg" in the saline (3.0 mM) is close to the normal concentration of 3.5 mM free Mg" in Periplaneta urneric-ana haemolymph (Wiedler and Sieck 1977). Since Mg' ' is known to stimulate trehalose phosphate synthase in Hyalophora c*ec.ropici fat body (Murphy and Wyatt 1965).…”

Section: Discussionmentioning

confidence: 95%

Corpus cardiacum stimulated trehalose efflux from cockroach (Periplaneta americana) fat body: control by calcium

Steele¹,

Paul²

1985

Can. J. Zool.

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Cockroach fat body incubated in a simple physiological saline solution releases trehalose to the surrounding medium. The output of trehalose occurs in the absence of ambient Ca2+ and decreases slowly with time. In two separate experiments, 0.1 mM CaCl2 added to the saline increased the output of trehalose on average by 70% but higher concentrations of Ca2+ did not further increase the efflux of trehalose. Stimulation of trehalose efflux by corpus cardiacum extract is absolutely dependent on extracellular Ca2+, no increase occurring beyond the basal level in the absence of the ion. The activity of corpus cardiacum extract increases as the concentration of CaCl2 is increased to 0.5 mM. This concentration of Ca2+ in the saline permits the extract to increase trehalose efflux by as much as 60% above the basal level. Corpus cardiacum extract, as well as the hypertrehalocaemic agents cyclic AMP and theophylline, increase significantly the influx of Ca2+ into fat body in vitro. The basal efflux of trehalose from fat body and that stimulated by corpus cardiacum extract is not dependent on extracellular Mg2+.

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Section: Discussionmentioning

confidence: 95%

Corpus cardiacum stimulated trehalose efflux from cockroach (Periplaneta americana) fat body: control by calcium

Steele¹,

Paul²

1985

Can. J. Zool.

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“…It was observed in Periplaneta americana that haemolymphs sampled from different body parts of the same specimen showed an unequal distribution of Na + , K + and Ca 2+ [37]. Since inorganic ions circulate rather without restrictions in an aqueous medium, it is likely that the binding of slowly diffusing macromolecules in the haemolymphs to inorganic ions enhances their distribution [40]. In the case of katydid ear with a fluid-filled cavity or AV, the contained liquid is separated from the haemolymphs circulating through the tibia [15].…”

Section: Discussionmentioning

confidence: 99%

“…In insects, the haemolymph ion concentration varies significantly among individuals and also among the different body parts of the same specimen [37]. Ion concentration is affected by diet, water content and the heterogeneous flow of the haemolymph through the body [35,40]. If the inner ear liquid is considered as being a continuation of the haemolymph channel, its ionic concentration could be susceptible to fluctuations, just as occurs in other body regions.…”

Section: Discussionmentioning

confidence: 99%

“…The obtained analytical results confirm that the ion compositions of the inner ear liquid and haemolymph samples were mainly constituted by Na + , K + , Mg 2+ and Ca 2+ (figure 1); however, their concentration varies between the two solutions. A factor contributing to the variation between haemolymph and inner ear liquid concentration is the possible binding of these ions to other dissolved molecules such as proteins, carbohydrates or nucleic acids [40]. It was observed in Periplaneta americana that haemolymphs sampled from different body parts of the same specimen showed an unequal distribution of Na + , K + and Ca 2+ [37].…”

Section: Ion Concentrationmentioning

confidence: 99%

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The chemistry of an insect ear: ionic composition of a liquid-filled ear and haemolymphs of Neotropical katydids

Sarria-S

Montealegre‐Z

Gonzalez-Rodriguez

2023

J. R. Soc. Interface.

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The purpose of this study is to examine and to compare the ionic composition of the haemolymph and the ear fluid of seven species of katydids (Orthoptera: Tettigoniidae) with the aim of providing from a biochemical perspective a preliminary assessment for an insect liquid contained in the auditory organ of katydids with a hearing mechanism reminiscent of that found in vertebrates. A multi-element trace analysis by inductively coupled plasma optical-emission spectrometry was run for 16 elements for the ear liquid of seven species and the haemolymph of six of them. Based on the obtained results, it can be recognized that the ionic composition is variable among the studied insects, but sodium (Na + ), potassium (K + ), calcium (Ca 2+ ) and magnesium (Mg 2+ ) are the most prominent of the dissolved inorganic cations. However, the ion concentrations between the two fluids are considerably different and the absence or low concentration of Ca 2+ is a noticeable feature in the inner ear liquid. A potential relationship between the male courtship song peak frequency and the total ion (Na + , K + , Mg 2+ and Ca 2+ ) concentration of the inner ear liquid is also reported.

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“…However, Wagner (1975) points out that V,,,, is depressed when plasma protein binding is present. Since Weidler & Sieck (1977) have demonstrated the binding of Naf and Cl-to macromolecules in the hemolymph of another cockroach species (viz. Periplaneta americana), the same situation may well obtain in Blaberus.…”

Section: Discussionmentioning

confidence: 99%

Osmoregulation in Blaberus craniifer after parenteral injections of NaCl solutions

Weidler

1977

Comparative Biochemistry and Physiology Part A: Physiology

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After injection of NaCl into the abdominal hemocoel of BIaberus craniifer, the osmotic concentration of antenna1 hemolymph peaked at 1.25 hr and returned to pre-injection concentration by 21 hr. The mean plasma clearance was 2.67 @/hr.2. Force-feeding of water 15min after injection of NaCl prevented the early rise in hemolymph osmotic concentration, but a later gradual increase in osmotic concentration occurred.3. The onset of spontaneous drinking occurred 0.8 hr after NaCl injection; this correlated with an elevation in hemolymph osmotic concentration.4. Cumulative spontaneous water intake over 4 days was proportional to the daily injected dose of NaCl.

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A study of ion binding in the hemolymph of Periplaneta americana

Abstract: Elect of cxtcrnal chloride replacement on action potentials of giant axons in Periplunetu umrricunu. Camp. Biochcvn. Physiol.

Cited by 17 publications

References 16 publications

Corpus cardiacum stimulated trehalose efflux from cockroach (Periplaneta americana) fat body: control by calcium

Corpus cardiacum stimulated trehalose efflux from cockroach (Periplaneta americana) fat body: control by calcium

The chemistry of an insect ear: ionic composition of a liquid-filled ear and haemolymphs of Neotropical katydids

Osmoregulation in Blaberus craniifer after parenteral injections of NaCl solutions

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