Pathogenicity of the protozoan parasite Marteilioides chungmuensis in the Pacific oyster Crassostrea gigas

Tun, Kay Lwin; Itoh, Naoki; Shimizu, Yasuko; Yamanoi, Hideo; Yoshinaga, Tomoyoshi; Ogawa, Kazuo

doi:10.1016/j.ijpara.2007.07.002

Cited by 19 publications

(9 citation statements)

References 14 publications

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“…Infections with Marteilioides chungmuensis , a paramyxean protozoa affecting the normal oviposition and development of fertilized eggs and impairing the product quality by damaging the visual attractiveness have been identified as causative factors in the reduced aquaculture production of oysters, C. gigas [2]. Studies of this ovarian parasite included the assessment of microstructures [3], process of spore formation [4], initial infection route[5], rate of infection [2,4,6,7], development of diagnostic methods [8,9], pathogenicity [2,9], biochemical examinations [6], and effects of environmental factors [10,11]. A variety of such studies have been conducted in Korea and Japan.…”

Section: Introductionmentioning

confidence: 99%

Non-specific Defensive Factors of the Pacific OysterCrassostrea gigasagainst Infection withMarteilioides chungmuensis: A Flow-Cytometric Study

et al. 2011

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In order to assess changes in the activity of immunecompetency present in Crassostrea gigas infected with Marteilioides chungmuensis (Protozoa), the total hemocyte counts (THC), hemocyte populations, hemocyte viability, and phagocytosis rate were measured in oysters using flow cytometry. THC were increased significantly in oysters infected with M. chungmuensis relative to the healthy appearing oysters (HAO) (P<0.05). Among the total hemocyte composition, granulocyte levels were significantly increased in infected oysters as compared with HAO (P<0.05). In addition, the hyalinocyte was reduced significantly (P<0.05). The hemocyte viability did not differ between infected oysters and HAO. However, the phagocytosis rate was significantly higher in infected oysters relative to HAO (P<0.05). The measurement of alterations in the activity of immunecompetency in oysters, which was conducted via flow cytometry in this study, might be a useful biomarker of the defense system for evaluating the effects of ovarian parasites of C. gigas.

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Section: Introductionmentioning

confidence: 99%

Non-specific Defensive Factors of the Pacific OysterCrassostrea gigasagainst Infection withMarteilioides chungmuensis: A Flow-Cytometric Study

et al. 2011

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“…The parasites affect the reproductive follicles causing irregular enlargement of the infected gonadal tissues [127]. Although infected female oysters produced oocytes continuously and spawned repeatedly, however the parasites cause nutritional wasting and mortality, and affect the reproductive output of infected female oyster [127,128]. Ngo et al [129] also reported that M. chungmuensis delays spawning and cause damages to ripe oocytes.…”

Section: Conclusion and Future Research Perspectivesmentioning

confidence: 99%

Pharmacology and Molecular Identity of Serotonin Receptor in Bivalve Mollusks

Alavi¹,

Nagasawa²,

Takahashi³

et al. 2017

Serotonin - A Chemical Messenger Between All Types of Living Cells

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It is now known that 5-HT regulates several neurobehavioral systems such as mood, appetite, sleep, learning, and memory. It also plays critical roles in the physiological functions of peripheral organs involved in stress, growth, and reproduction in the animal kingdom. 5-HT content has seen to be higher in the nervous system of bivalves than those of other examined invertebrates and vertebrates. Thus, bivalves have been considered as an excellent model to investigate 5-HT functions in neurological and peripheral systems. The present study reviews knowledge on 5-HT signaling mediated through 5-HT receptor and its physiological contribution to regulate reproduction in bivalves. Two G-protein-coupled 5-HT 1-like receptors have been cloned in bivalve species. However, binding affinities of the 5-HT agonists and antagonists to the isolated plasma membrane proteins and their effects on spawning in bivalves suggest the presence of a single or mixed 5-HT 1-, 5-HT 2-, and 5-HT 3-like receptors. It has suggested that the 5-HT-like receptors in bivalves are distinct from those of mammalian 5-HT receptors due to pharmacological properties. The present review pays a special attention to future research perspectives to better understand 5-HT regulation of reproduction in bivalves, which can provide us with satisfactory knowledge to elucidate reproductive disorders associated with dysfunctions of the neurotransmitter system.

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“…22.7 ). Although the mortality caused by this disease is not extremely high (Tun et al 2008 ), infected oysters with an abnormal appearance are unacceptable in the market. Infection of M. chungmuensis has also been reported from other oyster species (Limpanont et al 2013 ), though abnormal appearance has never been reported in these host oysters.…”

Section: Marteiliamentioning

confidence: 99%

Fish and Shellfish Diseases Caused by Marine Protists

2015

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Many protists specifi cally parasitize marine organisms, and some of them cause diseases in economically important fi sh, shellfi sh or other invertebrates. In this chapter, we give general accounts of considerable protistan parasites for the fi shery industry with their impacts and control measures, if any. Parasites of fi sh include amoebae, ichthyosporea, fl agellates, X-cells with an unknown taxonomic position, and ciliates, and those of invertebrates include Marteilia and Perkinsus for shellfi sh, and a kinetoplastid for edible ascidians.

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Pathogenicity of the protozoan parasite Marteilioides chungmuensis in the Pacific oyster Crassostrea gigas

Cited by 19 publications

References 14 publications

Non-specific Defensive Factors of the Pacific OysterCrassostrea gigasagainst Infection withMarteilioides chungmuensis: A Flow-Cytometric Study

Non-specific Defensive Factors of the Pacific OysterCrassostrea gigasagainst Infection withMarteilioides chungmuensis: A Flow-Cytometric Study

Pharmacology and Molecular Identity of Serotonin Receptor in Bivalve Mollusks

Fish and Shellfish Diseases Caused by Marine Protists

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