Reaction of rodlet cells to a myxosporean infection in kidney of the bluegill, <i>Lepomis macrochirus</i>

Leino, Richard L.

doi:10.1139/z96-027

Cited by 91 publications

(126 citation statements)

References 10 publications

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“…Its function is not clear yet (DESSER & LESTER 1975;BARBER & MILLS WESTERMANN 1985). However, there seems to be a relationship between their presence and the likelihood of stress to the fish (LEINO 1996;KOPONEN & MYERS 1999;DEZFULI et al 2000). The catfish analyzed in this study were collected directly from the environment and sectioned under anaesthetic.…”

Section: Discussionmentioning

confidence: 99%

Morphology of gills of the seawater fish Cathorops spixii (Agassiz) (Ariidae) by scanning and transmission electron microscopy

Eiras-Stofella

Fank-de-Carvalho²

2002

Rev. Bras. Zool.

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ABSTRACT. Gills of the seawater fi sh Cat/w raps spixii (Agassiz, 1829) were submitted to ro uti ne processing for observation in scanning and transmission electron microscopy. The wrinkled surface of the gill filaments showed well-defined cellular ultrastructures. Microridges on cellular surface were projected over all gill structures, including respiratory lamellae. Chloride cells were usually at primary lamellae. Some rod let cells were fo und. Mucous secretory cells were uncommon at all parts of the gill arches. The pharyngeal region of the gill arches showed a lot oftaste buds but no spines. There were smal l and strong rakers. Such morphology is indicati ve of fishes that swallow small food but do not have filtering habits. At the ultrastructural level the gills of TUARO et al. 1998; AZEVEDO et al. 1999), and it is found throughout the year on seashore of Parana State, southern Brazil.Morphological studies of fishes on the Brazilian seashore and continental waters, especially on gill ultrastructures, have begun just a few years ago (FERNAN-DES & PERNA 1995; MORON & FERNANDES 1996; EIRAS-STOFELLA & CHARVET-ALMEIDA 1997 MAZON et al. 1998; EIRAS-STOFELLA et al. 2001 ).The present research includes the morphologi cal description of the gills of C. spixii with the observation of ultrastructural detail s. The relations between the morphology of the gill s, the presence of certain cells, feeding habits, and some other characteristics of this species are also discussed. MATERIALS AND METHODSCathorops spixii fishes were coll ected in the Parana coast (Brazil), near the 25°32'S-48°28' W and 25°15 'S-48°20'W coordinates, with the use of trawl nets and lines.After anaesthetizing them (MS 222), the second gill arches (B all) of the collected fishes were extracted and fixed in a solution of buffered glutaraldehyde.

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Section: Discussionmentioning

confidence: 99%

Morphology of gills of the seawater fish Cathorops spixii (Agassiz) (Ariidae) by scanning and transmission electron microscopy

Eiras-Stofella

Fank-de-Carvalho²

2002

Rev. Bras. Zool.

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“…Several cellular types are involved in the response against myxosporeans. Rodlet cells (RC) are among them, as they are generally increased in infected tissues or have been observed in close vicinity to myxosporeans, some times even discharching their rods (Leino, 1996;Palenzuela et al, 1999;Muñoz et al, 2000a). By contrast, RC are very scarce in D. puntazzo, even when infected by E. leei .…”

Section: Non-specific Immune Responsementioning

confidence: 99%

Fish immune response to Myxozoan parasites

Sitjà‐Bobadilla

2008

Parasite

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Summary :Myxozoan parasites are responsible for important economic losses among fisheries and aquaculture industries, and hence the high interest in studying the immune response of fish against them. The most important data available concerning the immune response of fish against myxosporeans are reviewed, with emphasis on the different innate and adaptive immune mechanisms, their relationship with natural and acquired resistance and the strategies to control and prevent myxosporoses. Cellular effectors (lymphocytes, granulocytes, phagocytes, non-specific cytotoxic cells, rodlet cells) and humoral factors (lysozyme, peroxidades, antiproteases, complement, specific antibodies) have been examined for several myxosporoses, and some immune relevant genes have been studied. This information will be crucial for the future development of vaccines and other preventive strategies such as immunomodulation and selection of disease-resistant strains

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“…These enigmatic cells have been observed in tissues of marine and freshwater teleosts. Although their origin and function remain controversial, some authors attribute to them a role in the host's reaction against pathogenic organisms (Leino 1996, Reite 1997, Dezfuli et al 1998, and more specifically in the inflammatory response observed in certain parasitoses (Dezfuli et al 2000).…”

Section: Pathological Effects and Course Of Infectionmentioning

confidence: 99%

Cryptosporidium scophthalmi n. sp. (Apicomplexa: Cryptosporidiidae) from cultured turbot Scophthalmus maximus. Light and electron microscope description and histopathological study

Álvarez-Pellitero¹,

Quiroga²,

Sitjà‐Bobadilla³

et al. 2004

Dis. Aquat. Org.

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Cryptosporidium scophthalmi n. sp. is described from the turbot Scophthalmus maximus L., sampled from different farms on the coast of NW Spain. The parasite was found mainly in the intestinal epithelium and very seldom in the stomach. Oocysts were almost spherical, with 4 naked sporozoites and a residuum, and measured 3.7-5.03 × 3.03-4.69 µm (mean 4.44 × 3.91) (shape index 1.05-1.34, mean 1.14). Sporulation was endogenous, as fully sporulated oocysts were found within the intestinal epithelium, lumen and faeces. Merogonial and gamogonial stages were in the typical extracytoplasmic position, whereas sporogonial stages were deep within the epithelium. Oocysts and other stages of C. scophthalmi comply with most of the diagnostic features of the genus Cryptosporidium, but differ from all hitherto described species. Ultrastructural features, including the characteristic feeding organelle, were mainly comparable with those of other Cryptosporidium species. Mitochondria were frequently observed in sporozoites. Infection prevalence was very variable, and juvenile fish were most frequently and intensively parasitised. External clinical signs were not detected, although some fish showed intestinal distension at necropsy. The marked histopathological damage occurring in severe infection includes distension of epithelial cells by large vacuoles, containing clusters of oocysts, and can lead to sloughing of epithelial cell remnants and oocysts or even detachment of intestinal mucosa. An inflammatory reaction involving leucocyte infiltration was sometimes observed.

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Reaction of rodlet cells to a myxosporean infection in kidney of the bluegill, Lepomis macrochirus

Cited by 91 publications

References 10 publications

Morphology of gills of the seawater fish Cathorops spixii (Agassiz) (Ariidae) by scanning and transmission electron microscopy

Morphology of gills of the seawater fish Cathorops spixii (Agassiz) (Ariidae) by scanning and transmission electron microscopy

Fish immune response to Myxozoan parasites

Cryptosporidium scophthalmi n. sp. (Apicomplexa: Cryptosporidiidae) from cultured turbot Scophthalmus maximus. Light and electron microscope description and histopathological study

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