Effects of starvation and a carbohydrate-rich diet on glycogen metabolism in a gastropod mollusc, Megalobulimus oblongus

Rossi, Isabel Cristina; Silva, Roselis S.M. da

doi:10.1016/0300-9629(93)90404-r

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…The sensitivities of the biochemical indices in molluscs had not been directly compared before the present study, but decreases in each of the tested biochemical indices during starvation have been reported in gastropods and bivalves: the RNA : DNA ratio in the American oyster Crassostrea virginica and the glycogen content in the Pacific oyster Crassostrea gigas , M. oblongus , H. discus discus , and the freshwater mussels Amblema plicata and Quadrula pustulosa 3,4,15,16,22 . Among Crassostrea species, the RNA : DNA ratio showed a significant decrease three days after the start of starvation in C. virginica , 3 whereas the glycogen content did not show any differences between fed and starved C. gigas for approximately 2 months 4 .…”

Section: Discussionmentioning

confidence: 89%

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Effects of starvation on RNA : DNA ratio, glycogen content, and C : N ratio in columellar muscle of the Japanese turban shell Turbo (Batillus) cornutus (Gastropoda)

Okumura¹,

Nagasawa²,

Hayashi³

et al. 2002

Fisheries Sci

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The validity of using the RNA : DNA ratio, glycogen content, and C : N ratio in the columellar muscle as indicators of the nutritional condition in the Japanese turban shell Turbo cornutus was examined. These biochemical indices were compared between fed and starved animals. The fed animals were fed brown algae to satiation for 108 days as a control, whereas the starved animals were not fed for the first 75 days and then fed for next 33 days. All three indices declined during the starvation period, and the values for the starved group were significantly lower than those for the fed group during days 20–75. At day 108, after the re‐feeding period, the indices for the starved group were found to have increased. Among the indices, only the RNA : DNA ratio for the starved males responded rapidly to starved conditions and became significantly lower even at day 4, and only the RNA : DNA ratio for the starved males and females recovered to those levels of the fed animals at day 108. The results indicated that the RNA : DNA ratio is the most rapid indicator of nutritional stress among the three indices. However, it is recommended that glycogen content and C : N ratio be used in addition to the RNA : DNA ratio for monitoring the health of T. cornutus as the RNA : DNA ratio showed large variations.

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Section: Discussionmentioning

confidence: 89%

“…However, to our knowledge, research on the biochemical response to nutritional stress in gastropods has been limited to only a few species, such as the land pulmonate gastropod Megalobulimus oblongus , the disk abalone Haliotis discus discus , and the South African gastropod Turbo sarmaticus 15–17 …”

Section: Introductionmentioning

confidence: 99%

Effects of starvation on RNA : DNA ratio, glycogen content, and C : N ratio in columellar muscle of the Japanese turban shell Turbo (Batillus) cornutus (Gastropoda)

Okumura¹,

Nagasawa²,

Hayashi³

et al. 2002

Fisheries Sci

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“…Megalobulimus abbreviatus is a giant South American snail that can be found in Argentina, Paraguay, and sub-tropical regions of Brazil (Bequaert, 1948;Sawaya & Petersen, 1962). Due to its size (Pitoni et al, 1976), M. abbreviatus and other congenerics have proved to be good experimental models for physiological (De Jorge et al, 1965;Jaeger, 1965;Marques & Pereira, 1970;Romero & Hoffmann, 1991;Belló-Klein et al, 1993;Rossi & Da Silva, 1993;Da Silva & Zancan, 1994;Romero et al, 1994) and morphological (Zancan et al, 1994;Zancan & Achaval, 1995;Zancan et al, 1997;Donelli et al, 1998;Faccioni-Heuser et al, 1999;Santos et al, 2002) studies.…”

Section: Introductionmentioning

confidence: 99%

The annual reproductive cycle of the snail Megalobulimus abbreviatus (Bequaert, 1948) (Gastropoda, Pulmonata)

Horn¹,

Achaval²,

Zancan

2005

Braz. J. Biol.

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Morphological changes in the sexual organs of the pulmonates were observed throughout a year and correlated with reproductive-cycle periods. Reproductive-organ weights of the snail Megalobulimus abbreviatus were recorded seasonally and gonad sections were analyzed morphologically. The weights were used to obtain the organosomatic index. Mean oocytic diameter and oocytic maturation index were based on gonad sections. It was concluded that M. abbreviatus is an iteroparous snail whose annual reproductive cycle is characterized by mating and egg laying throughout spring and early summer, and also by reproductive system preparation, occurring over the remainder of the summer until the end of winter, for a new breeding season.

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“…Regardless of the strategy employed, all anoxia‐tolerant animals accumulate high levels of glycogen, the main fermentable fuel found in animal cells (Urich, '94; Lutz and Storey, '97; Hochachka and Somero, 2002). The total glycogen level found in M. abbreviatus CNS was high (De Fraga et al, 2004) as compared with the other snail tissues, including heart, mantle, and hepatopancreas (Haeser and De Jorge, '71; Marques and Falkmer, '76; Rossi and Da Silva, '93; Da Silva and Zancan, '94; Dias, 2000).…”

Section: Discussionmentioning

confidence: 99%

Control of carbohydrate metabolism in an anoxia‐tolerant nervous system

2010

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Anoxia-tolerant animal models are crucial to understand protective mechanisms during low oxygen excursions. As glycogen is the main fermentable fuel supporting energy production during oxygen tension reduction, understanding glycogen metabolism can provide important insights about processes involved in anoxia survival. In this report we studied carbohydrate metabolism regulation in the central nervous system (CNS) of an anoxia-tolerant land snail during experimental anoxia exposure and subsequent reoxygenation. Glucose uptake, glycogen synthesis from glucose, and the key enzymes of glycogen metabolism, glycogen synthase (GS) and glycogen phosphorylase (GP), were analyzed. When exposed to anoxia, the nervous ganglia of the snail achieved a sustained glucose uptake and glycogen synthesis levels, which seems important to maintain neural homeostasis. However, the activities of GS and GP were reduced, indicating a possible metabolic depression in the CNS. During the aerobic recovery period, the enzyme activities returned to basal values. The possible strategies used by Megalobulimus abbreviatus CNS to survive anoxia are discussed.

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Effects of starvation and a carbohydrate-rich diet on glycogen metabolism in a gastropod mollusc, Megalobulimus oblongus

Cited by 9 publications

References 14 publications

Effects of starvation on RNA : DNA ratio, glycogen content, and C : N ratio in columellar muscle of the Japanese turban shell Turbo (Batillus) cornutus (Gastropoda)

Effects of starvation on RNA : DNA ratio, glycogen content, and C : N ratio in columellar muscle of the Japanese turban shell Turbo (Batillus) cornutus (Gastropoda)

The annual reproductive cycle of the snail Megalobulimus abbreviatus (Bequaert, 1948) (Gastropoda, Pulmonata)

Control of carbohydrate metabolism in an anoxia‐tolerant nervous system

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