Seasonal variation in the innate immune parameters of the Asian catfish Clarias batrachus

Kumari, Jaya; Sahoo, P.K.; Swain, T.; Sahoo, S. K.; Sahu, A. K.; Mohanty, B.R.

doi:10.1016/j.aquaculture.2005.07.025

Cited by 61 publications

(31 citation statements)

References 26 publications

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“…Indeed, the investigation of reproductive-immune interactions in fish has demonstrated that sexual maturation is often related to both innate and adaptive immune responses. These interactions affect innate immune proteins (Kumari et al 2006;Bowden et al 2007;Morgan et al 2008), acquired antibodies (Browser and Munson 1986;Steine et al 2001), and the number and proportion of leukocytes (Lamková et al 2007). Temperature and, to a lesser extent, other factors such as photoperiod appear to be the major cues driving these seasonal changes in immune markers (Bowden et al 2007).…”

Section: Interactions Between the Reproductive And Immune Systems In mentioning

confidence: 98%

The effects of estrogenic and androgenic endocrine disruptors on the immune system of fish: a review

2011

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During the last decade, a number of studies have shown that, in addition to their classically described reproductive function, estrogens and androgens also regulate the immune system in teleosts. Today, several molecules are known to interfere with the sex-steroid signaling. These chemicals are often referred to as endocrine disrupting contaminants (EDCs). We review the growing evidence that these compounds interfere with the fish immune system. These studies encompass a broad range of approaches from field studies to those at the molecular level. This integrative overview improves our understanding of the various endocrine-disrupting processes triggered by these chemicals. Furthermore, the research also explains why fish that have been exposed to EDCs are more sensitive to pathogens during gametogenesis. In this review, we first discuss the primary actions of sex-steroid-like endocrine disruptors in fish and the specificity of the fish immune system in comparison to mammals. Then, we review the known interactions between the immune system and EDCs and interpret the primary effects of sex steroids (estrogens and androgens) and their related endocrine disruptors on immune modulation. The recent literature suggests that immune parameters may be used as biomarkers of contamination by EDCs. However, caution should be used in the assessment of such immunotoxicity. In particular, more attention should be paid to the specificity of these biomarkers, the external/internal factors influencing the response, and the transduction pathways induced by these molecules in fish. The use of the well-known mammalian models provides a useful guide for future research in fish.

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Section: Interactions Between the Reproductive And Immune Systems In mentioning

confidence: 98%

The effects of estrogenic and androgenic endocrine disruptors on the immune system of fish: a review

2011

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“…However, the studies investigating seasonal changes in immune defenses in fish are scarce (for instance Hutchinson and Manning 1996;Le Morvan et al 1998;Scapigliati et al 1999;Bowden et al 2004;Kumari et al 2006), and the majority of studies investigating the differential effects of temperature on innate or acquired immune defenses are provided in experimental conditions. Nevertheless, the information concerning the seasonal influence on the immune function could be helpful for understanding the energetic trade-off between different functions in fish, as the investment in many functions can vary in time because of seasonal effects.…”

Section: Introductionmentioning

confidence: 98%

Seasonal changes of immunocompetence and parasitism in chub (Leuciscus cephalus), a freshwater cyprinid fish

et al. 2007

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Seasonal variation of water characteristics, predominantly temperature, is considered to strongly affect fish physiology and immunology. In nature, this variation directly influences the life cycle especially in fish parasites, but the infection of parasites is also altered by the host immune response. This study is aimed to analyze the seasonal changes in selected physiological and immunological parameters, the latter a potential measure of fish immunocompetence. Moreover, the seasonal changes in metazoan parasite infection were investigated, and the potential associations between fish physiology, immunocompetence, and parasitism were estimated. No differences in gender were recognized for immunological parameters. The significant differences in the spleen-somatic index were found among fish samples of different seasons indicating higher investment in spleen size in April (after winterizing) and August (post-breeding with low gonado-somatic index [GSI]). The significant seasonal differences in erythrocyte and leukocyte cell counts, as well as in phagocyte count affecting respiratory burst, were recorded. The general trend of leukocyte composition was similar in all seasons investigated; however, the changes in proportion of different neutrophilic cells were reported. The parasite diversity and the infection parameters in parasite communities were highest in spring and early summer. When comparing parasite abundance in infracommunities among seasons, the statistically highest values were observed in April and June for Monogenea, in April and November for Acanthocephala, and in April for Cestoda. The positive correlations between GSI and the parasite abundance of groups with higher infection parameters were found in males. Moreover, the positive association between Monogenea as the dominant parasite group and respiratory burst was observed. The higher investment in condition and the seasonal variation in GSI were associated with a decrease immune function measured by spleen size or leukocyte cell count especially for males suggesting the seasonal energy allocation between immune function and somatic or reproductive investment.

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“…Seasonality induces changes in the functioning of the immune system in many of the vertebrates (Zapata et al 1992;Collazos et al 1995) -mammals in particular (Yellon et al 1999;Bilbo et al 2002;Prendergast et al 2002) -and also in fish (Zapata et al 1992;Collazos et al 1998;Guijarro et al 2003;Kumari et al 2006). These changes are likely the result of a mechanism that has developed to counteract the environmentally dependant parallel changes in the variability of the virulence factors of most pathogens and indicate that an artificial photoperiod may also be able to modify immunocompetence.…”

Section: Introductionmentioning

confidence: 96%

Effects of constant light on haematological parameters of cultured rainbow trout (Oncorhynchus mykiss) in the Southern Hemisphere

Valenzuela

Silva

Klempau

2006

Fish Physiol Biochem

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The effects of artificial photoperiod regimes on reproductive patterns have been studied in several species, as have haematological parameters. However, information on how artificial photoperiods may affect blood components is scarce, especially under field conditions. We have assessed the effects of constant light [long day (LD) photoperiod: 24 h (light):0 h (dark)] on haematological parameters of cultured rainbow trout in Chile (Southern Hemisphere). In the initial stage (March up to June), two groups of fish were maintained under similar conditions and under the ambient (natural) photoperiod (NP). One group was then placed under the LD photoperiod regime for 2 months (June/July), following which it was returned to the NP (August-January); the control group remained under the NP throughout the experiment (March-January). All fish were assessed for haematological parameters and growth performance at various times during the experiment. During the initial stage, no differences were found between groups. However, at the end of the LD 24:0 period, the LD fish had increased haematocrit values and erythrocyte numbers and diminished mean corpuscular haemoglobin. After the LD fish had been returned to the NP, they developed secondary sexual characteristics and had a 40-44% decrease in the number of leukocytes.

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Seasonal variation in the innate immune parameters of the Asian catfish Clarias batrachus

Cited by 61 publications

References 26 publications

The effects of estrogenic and androgenic endocrine disruptors on the immune system of fish: a review

The effects of estrogenic and androgenic endocrine disruptors on the immune system of fish: a review

Seasonal changes of immunocompetence and parasitism in chub (Leuciscus cephalus), a freshwater cyprinid fish

Effects of constant light on haematological parameters of cultured rainbow trout (Oncorhynchus mykiss) in the Southern Hemisphere

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