- Open Access
Host, pathogen and the environment: the case of Macrobrachium rosenbergii, Vibrio parahaemolyticus and magnesium
Gut Pathogens volume 8, Article number: 15 (2016)
Macrobrachium rosenbergii is well-known as the giant freshwater prawn, and is a commercially significant source of seafood. Its production can be affected by various bacterial contaminations. Among which, the genus Vibrio shows a higher prevalence in aquatic organisms, especially M. rosenbergii, causing food-borne illnesses. Vibrio parahaemolyticus, a species of Vibrio is reported as the main causative of the early mortality syndrome. Vibrio parahaemolyticus infection in M. rosenbergii was studied previously in relation to the prawn’s differentially expressed immune genes. In the current review, we will discuss the growth conditions for both V. parahaemolyticus and M. rosenbergii and highlight the role of magnesium in common, which need to be fully understood. Till date, there has not been much research on this aspect of magnesium. We postulate a model that screens a magnesium-dependent pathway which probably might take effect in connection with N-acetylglucosamine binding protein and chitin from V. parahaemolyticus and M. rosenbergii, respectively. Further studies on magnesium as an environment for V. parahaemolyticus and M. rosenbergii interaction studies will provide seafood industry with completely new strategies to employ and to avoid seafood related contaminations.
Macrobrachium rosenbergii is a freshwater prawn species of which there is a considerable production range when compared to Macrobrachium nipponense (information sourced from http://www.fao.org/fishery/culturedspecies/Macrobrachium_rosenbergii/en). Seafood is affected by several bacteria, and the major factors affecting bacterial survival in sea water are: absence of required nutrients, presence of toxic substances in sea water, presence of bacteriophages, adsorption of bacteria and their sedimentation, the harmful action of the sunlight, utilization of bacteria as food by not only protozoa, but other predators and competitive, antagonistic effects of the microorganism .
There are a wide range of bacteria such as Vibrio cholerae, Escherichia coli 0157:H7, Shigella, Campylobacter jejuni, Leptospirosis, Salmonella, Helicobacter pylori, Legionella and the Mycobacterium avium complex reported from contaminated water (information sourced from http://www.cdc.gov/healthyswimming) [2, 3]. However, mostly Vibrio species are pathogenic to marine organisms. Previously, pathogenicity of Vibrio anguillarum, Vibrio anginolyticus, Vibrio panaeicida, V. vulnificus, Vibrio harveyi, and Vibrio salmonicida was observed in the population of fish and other marine organisms such as eel [4, 5]. Those associated with coral reef bleaching were Vibrio campbellii, Vibrio shiloi, V. harveyi and Vibrio fortis. These Vibrios are a real cause of concern especially in the aquaculture industry .
In terms of aquatic food borne diseases, various virulence factors highlight Vibrio vulnificus, Vibrio parahaemolyticus, and V. cholerae considerably important. The factors primarily include the capsular polysaccharide, lipopolysaccharide, cytotoxins and flagellum [7, 8]. While V. parahaemolyticus and V. cholerae are mostly related to oysters, causing gastroenteritis . Vibrio vulnificus was observed to cause primary septicemia not only in marine populations , but also in humans. Most cases of infection were reported due to the consumption of seafood , especially shellfish [12–22]. Vibrio vulnificus was reported to have caused high fatality rates due to its invasiveness associated with soft-tissue infection and severe sepsis . This species was reported in an encapsulated form, which most commonly occurs in clinical isolates rather than environmental isolates .
Other species such as Vibrio fluvialis, Vibrio mimicus, Vibrio alginolyticus, Photobacterium damsel (Vibrio damsela), Vibrio metschnikovii, Vibrio cincimnatiensis, Vibrio fuenisii and Vibrio hollisae are also known to be pathogenic [23, 24]. These can cause severe infections to environmental specimens as well as human. Vibrio parahaemolyticus in particular was identified as a cause of food-borne illnesses , and is associated with the consumption of crab . It was also associated with seafood contamination ranging from crustacean, molluscan shellfish to the giant water prawn. Vibrio parahaemolyticus was previously studied of its infection in M. rosenbergii, with the latter’s expressed immune genes . Studies even reported N-acetylglucosamine binding protein in other species of Vibrio. It was shown to have the ability to bind chitinaceous structures such as the outer covering of crustaceans [28–30]. Several studies on GbpA in relation to Vibrio show GbpA as an attachment factor to the host chitin (the exoskeleton of crustaceans is called a carapace and consists of chitin) [28, 30, 31]. There are no studies yet on the aspect of GbpA in V. parahaemolyticus in particular, and its attachment to chitin of M. rosenbergii. The yet unmapped factors of V. parahaemolyticus are involved in triggering bacteria to possibly enter the prawns (M. rosenbergii) which are our concern in the present review article.
The farming of M. rosenbergii in modern times started in the early 1960′s (http://www.fao.org/docrep/005/y4100e/y4100e04.htm#P193_35649). It was during this time, M. rosenbergii require brackish water conditions for its survival, though being found as a freshwater prawn . However, V. parahaemolyticus was observed in both brackish and fresh water . From the above, the water conditions required by the prawn and bacteria appear quite similar. Hence, the term “conditions for growth” which precisely defines the effect of environmental factors cannot be ruled out in such studies. Therefore, the implication of dealing with host and the pathogen in connection with the environment is conferred by considering M. rosenbergii, V. parahaemolyticus, and magnesium. Based on this, a preliminary designed experiment was conducted by us in our lab at University of Malaya and the work is currently under communication as a research article. Our current review hypothesis the possible rhythmic roles that V. parahaemolyticus GbpA and M. rosenbergii chitin play in the presence of a magnesium environment which could indeed be very useful in not only farming of prawn, but also in future aquaculture research.
Macrobrachium rosenbergii lifecycle
Macrobrachium rosenbergii resides in the tropical environments of the freshwater (http://www.fao.org/docrep/005/y4100e/y4100e04.htm#P193_35649), but is influenced by the areas of brackish water. The female prawn bears a gelatinous mass underneath and between the fourth pair of its walking legs. It is here that the male prawn deposits the sperm. After a few hours of mating, eggs are laid and are fertilized by the sperm. “Berried Females” is the terminology used for females carrying the eggs . During the course of embryo development, the eggs remain constantly adhered to the female. It is during this time that the females migrate towards estuaries as the larvae cannot survive in fresh water for more than 2 days. The eggs hatch in brackish water where the salinity ranges from approximately nine parts per thousand (ppt) to 19 ppt , and they exist as free-swimming larvae at this stage.
The changes in phase from a larval to a post larval stage is very crucial in a prawn’s life cycle as it grows by the process of moulting (http://www.thefishsite.com/articles/464/moulting-and-behaviour-changes-in-freshwater-prawn/). It undergoes around 11 moults to transform into post larvae. These moults represent a process of metamorphosis. This stage is a critical part of a prawn’s life cycle as the old exoskeleton is replaced by a new soft exoskeleton underneath. It is here that the M. rosenbergii absorbs water into the tissue to increase in size (http://www.thefishsite.com/articles/464/moulting-and-behaviour-changes-in-freshwater-prawn/). Hence, the environmental conditions play a significant role in M. rosenbergii to enhance its ability to grow into an adult or to alter its chances of survival.
Vibrio genomes and distribution
Vibrios are widely distributed in marine environments and are easily adaptable to changes. Hence, these bacteria are considered significant for elucidating correlation between genome evolution and adaptation . 16S rRNA sequence is the basis on which the Vibrio species are largely classified within the Vibrionaceae family. To establish the DNA patterns of epidemiological interest, which are associated with the pathogenicity of the strain and to record correlation of diseases among bacteria with specific strains, serotyping was identified as one of the useful markers . Further, the distribution and emergence of pathogenic bacterial strains, the prediction of events [37, 38] through construction of models, and the identification of evolutionary relationships were also done by multi-locus sequence typing/analysis, serogroup association and comparative genomics . For example, with the potential pathogenicity of V. cholerae, V. parahaemolyticus, and the association of their serogroups, the specificity of the serogroups was correlated [36, 40, 41]. Studies on comparative genomics of Vibrio dealt with the phylogeny of 86 species of Vibrio and nine house-keeping genes primarily targeting biodiversity and genome evolution . However, comparative genomic analysis among both the pandemic and non-pandemic Vibrios distributed worldwide has to glean into the bacterial adaptation, evolution as well as antibiotic resistance. Such studies have dealt with the role of integrons in Vibrio species for which genes comprise of approximately 1–3 % of the genome , genome plasticity shaped by HGT and comparative analysis of pandemic and non-pandemic species [44, 45]. Considering the above studies, the distribution of Vibrio in different environmental conditions could be a significant factor responsible for its evolution, resistance, virulence and adaptation.
Growth conditions of the host and pathogen
Vibrio parahaemolyticus growth conditions
Temperature and growth
Vibrio parahaemolyticus is a Gram-negative bacterium which is curved and rod-shaped. It is a non-spore forming bacterium whose high motility is due to a polar flagellum. By a mechanism called swarming, these bacteria migrate across semi-solid surfaces  with the help of their lateral flagella. Throughout the world, inshore marine waters are the primary area where the distribution of V. parahaemolyticus is in abundance. It is mostly an inhabitant of estuarine marine water. The effect of seasons on V. parahaemolyticus has reported that V. parahaemolyticus in a small number was isolated from among sediment samples of marine water, but was not detected during the period of winter (i.e., November–March) in the Chesapeake Bay seawater . Vibrio parahaemolyticus is proposed to multiply when there is an increase in temperature i.e., by re-introduction of the microorganism into the sea water or by living in the marine sediments throughout the winter .
The temperature ranging from 35 to 39 °C  are the optimal conditions for the growth of V. parahaemolyticus. Though the doubling time of V. parahaemolyticus is as little as 5 min , under optimal conditions this organism has a generation time of less than 20 min. Hence, V. parahaemolyticus is most prevalently observed in a suitable environment in the course of the warm season. In peaking summer, it causes food borne outbreaks as it exhibits mesophilism [54, 55]. Though the count of V. parahaemolyticus in seafood which is freshly harvested are rather lower than the dose of infection predicted , the rapid multiplying ability of this bacterium at suitable temperatures shows its presence in food, is enough to cause a disease.
Vibrio parahaemolyticus has an important need for its multiplication and living conditions, which is salinity. V. parahaemolyticus encounters salinity concentrations in the marine environment typically ranging between 0.8 and 3 % . With optimal levels ranging between 1 and 3 %, V. parahaemolyticus can thrive very well in different concentrations of sodium chloride, i.e., between 0.5 and 10 % based on laboratory studies .
Apart from salinity, the capacity of the organism to utilize, tolerate and thrive in marine conditions is affected by several different concentrations of metal ions present. V. parahaemolyticus isolates are found to survive in 300 mM magnesium (approximately 73,941 ppm), a condition which is considered as toxic to various other microorganisms. This is an example from severely polluted coastal waters in some parts of India . Vibrio parahaemolyticus survival rates under several conditions can be improved by the increase in its ability to utilize magnesium. A 5.5 kb plasmid in the bacterium is said to carry genes responsible for bacterial resistance to increased magnesium concentrations . Injured or thermally treated V. parahaemolyticus cells show increased uptake of magnesium, which indicates a possible higher requirement for magnesium not only for the stability and repair  of its ribosomes, but also its cell membrane.
Vibrio parahaemolyticus capability to survive magnesium or any metal ion at high concentrations out-competes other microorganisms of seawater for its own survival and growth in the presence of these ions.
Macrobrachium rosenbergii growth conditions
The optimal range for prawn larvae to survive is 28–31 °C. It was observed that a salinity of <10 % ppt would be ideal for hatcheries for freshwater prawn . Though calcium shows an important role in the formation of the exoskeleton (http://www.thefishsite.com/articles/464/moulting-and-behaviour-changes-in-freshwater-prawn/), it is the conditions which are favourable for the “survival” of larvae which stands of primary importance. There were reports which described magnesium as an important component in the environment for prawn survival. One such previous literature explains the requirement of the magnesium in juvenile prawns . A recent article  describes the effects of salinity with the use of artificial sea water. Here, it clearly explains the role of magnesium in the survival rates of post larvae. Taking an example of the effect of an acidic environment in the presence of aluminium, an increase in the magnesium ion (Mg++) was observed showing its importance in the survival stages of the post larvae . The composition of water which are good for prawn hatcheries are said to be 10–27 parts per million (ppm) magnesium in freshwater, 1250–1345 ppm magnesium in seawater and 460–540 ppm magnesium in brackish water .
These features and conditions show how important is the magnesium ion for the survival of larvae which undergo a very critical “moulting stage” before reaching the post-larval stage.
N-acetylglucosamine-binding protein, chitin and Vibrio parahaemolyticus
N-acetylglucosamine-binding protein was reported in Vibrio cholerae [30, 31] with its property to bind to epithelial cell surfaces and chitin in the host’s exoskeleton. The probable interactions of the V. parahaemolyticus GbpA (Additional file 1) was estimated from STITCH 3  interaction database as shown in Fig. 1. Figure 1 even shows the protein-chemical interactions of GbpA with chitin. The role of prawn chitin was previously studied with the ecology of toxigenic V. cholerae and cholera transmission [29, 65–70]. In few studies it was even observed that V. parahaemolyticus gets absorbed onto chitin particles and was dependent on several factors such the ions and the pH of seawater . Whereas, this was not observed in other bacteria such as E. coli or Pseudomonas flourescens . This shows how significant environment could be for bacteria to attach to the chitin of prawn, i.e., in the present scenario V. parahaemolyticus to the carapace of M. rosenbergii. The effect of GbpA attachment to chitin could be of potential hypothetical interest as previous studies showed that a type IV pili of V. parahaemolyticus mediates the attachment to chitin . An increase in the bacterial count in the presence of both chitin flakes and phosphate-buffer saline , but not in the presence of N-acetylglucosamine, starch and casein could probably support the link between the host and pathogen. This is explained with GbpA in relation to chitin in the presence of environmental magnesium further in the review. Bacteria such as V. fluvialis, V. parahaemolyticus, V. alginolyticus, V. mimicus, Listonella anguillarum and Aeromonas hydrophila were found to be capable of utilizing chitin as a sole source of nutrient in river as well as marine waters . This study shows, there could be probable interactions between GbpA and chitin of the host and pathogen. All these above mentioned factors could support the importance of GbpA and chitin as biomolecular counterparts from the bacteria and prawn, respectively.
Macrobrachium rosenbergii and V. parahaemolyticus appear to share a common magnesium environment
Vibrio parahaemolyticus has several virulence factors with which it can survive aquatic organisms, especially the giant fresh water prawn, M. rosenbergii .
The growth conditions of M. rosenbergii in the environment can be studied in depth to understand the adaptation correlation of V. parahaemolyticus to M. rosenbergii. Studies show that M. rosenbergii survival in different media compositions was observed with variations in NaCl, KCl and MgCl2 + MgSO4 .
The fertilization envelope of shrimp eggs was observed to thin, when there is a depletion in calcium and magnesium . Embryos in their early stages were shown to require optimal levels of medium including MgCl2 + MgSO4 for their proper development . The role of magnesium ion in the normal hatching rate or the newly hatched larvae was not shown to be significant , but its importance in prawn survival was observed .
There are various resistance factors which V. parahaemolyticus carry such as: cobalt, zinc, cadmium, and chromium resistance genes . This can also explain its possible survival rate with M. rosenbergii, which could have been exposed to toxic substances during its life cycle [79, 80]. During the course of evolution, the bacteria must have acquired these resistance genes on prolonged exposure while surviving together with the host, which is M. rosenbergii. The most interesting factor is the tolerance of V. parahaemolyticus unlike other bacteria to higher concentrations of magnesium, and its growth under iron-limiting conditions which appears directly proportional to conditions of the prawn larvae survival as mentioned earlier. Various studies on the importance of magnesium in Vibrio species support its significance as an environment, which was observed in one scenario where magnesium sulfate could regulate luminescence in Vibrio fischeri , while in the other, magnesium had a very high impact in promoting flagellation in Vibrio . Previously, research was done to check the effect of magnesium ion in protein secretion by magnesium-resistant bacterial strains  which indeed shows that magnesium cannot be ruled out in studies on Vibrio. Studies even highlighted that the growth of V. parahaemolyticus under iron limiting conditions was when the bacteria survived high concentrations of magnesium .
Figure 2 is a hypothetical schematic representation which shows magnesium ion as an important link between V. parahaemolyticus and M. rosenbergii. During the moulting stage of prawn, the prawn often loses a thick moult to regain a transparent exoskeleton (http://www.thefishsite.com/articles/464/moulting-and-behaviour-changes-in-freshwater-prawn/). The figure shows the relation of V. parahaemolyticus with the prawn following exuviation in the presence of magnesium. This is conveyed by keeping the magnesium environment constant, i.e., with its levels common to both prawn and bacteria. When a prawn undergoes exuviation, the GbpA of bacteria might probably have greater chances of binding strongly to the sensitive exoskeleton of the prawn. This when compared to the prawn before moulting, its thick exoskeleton might affect the attachment of GbpA to chitin. Here, the binding capacity of GbpA needs to be higher due to a strong layer of chitin containing exoskeleton. This will require further studies to understand the importance of the presence of magnesium to both the host and pathogen.
With regard to food-borne illnesses, V. parahaemolyticus contributes significantly to morbidity worldwide .
Apart from controlling the severity of bacterial vigour caused by V. parahaemolyticus, strategies to control disease spreading through seafood consumption caused by bacteria adapting to aquatic environments are indeed required and needs more attention. This is because, most human populations worldwide are relying on seafood consumption on a daily basis. There are many aquatic organisms which need to be considered for the control of bacterial infections from spreading. The basis of selecting V. parahaemolyticus and M. rosenbergii in the current review is because of the widely spreading early mortality syndrome (EMS), which is capable of producing a toxin similar to the cholera which can cause life-threatening diarrhoea [84–86].
We think that the utilization of magnesium ion to check any possible interactions between GbpA and carapace (chitin) of the bacteria and prawn, respectively could probably assist us to understand the significance of a magnesium environment. In the present context, as V. parahaemolyticus is dealt in relation with M. rosenbergii, a giant freshwater prawn of commercial importance, further research based on the aspect of magnesium ion usage by both the prokaryotic or eukaryotic counterparts could help us understand the contamination strategies better. One such strategy could be tweaking the magnesium levels in order to avoid bacteria from entering aquatic organisms. Our review provides the understanding that maintaining magnesium could be important in order to avoid bacteria from multiplying rapidly to infectious levels. Hence, this could help minimize the risk of contamination in the aquaculture systems which might help control food-borne diseases in the long run.
Cholera toxin cP
N-acetylglucosamine binding protein
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ST and SB wrote and edited the manuscript. Both authors read and approved the final manuscript.
TS was supported by a doctoral fellowship from University of Malaya under the Bright Sparks program (BSP 226(3)-12). SB would like to thank University of Malaya for the support from the PPP grant PG088-2012B and from the High Impact Research (HIR) Grant, H-23001-G000006.
The authors declare that they have no competing interests.
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Tiruvayipati, S., Bhassu, S. Host, pathogen and the environment: the case of Macrobrachium rosenbergii, Vibrio parahaemolyticus and magnesium. Gut Pathog 8, 15 (2016) doi:10.1186/s13099-016-0097-1
- Macrobrachium rosenbergii
- Vibrio parahaemolyticus