Author/Authors :
TEIMOORI, Salma WHO Collaborating Centre for Research and Control of Opisthorchiasis (Southeast Asian Liver Fluke Disease) - Tropical Disease Research Laboratory - Department of Pathology - Faculty of Medicine - Khon Kaen University, Khon Kaen, Thailand , SABOUR YARAGHI, Aliakbar Dept. of Nutrition and Biochemistry - School of Public Heal, Tehran, Iran , MAKKI, Mahsa Sadat Dept. of Medical Parasitology and Mycology - School of Public Health - Tehran University of Medical Sciences, Tehran, Iran , SHAHBAZI, Farideh Dept. of Medical Parasitology and Mycology - School of Public Health - Tehran University of Medical Sciences, Tehran, Iran , NAZMARA, Shahrokh Dept. of Environmental Health Engineering - School of Public Health and Institute of Public Health Research - Tehran University of Medical Sciences, Tehran, Iran , ROKNI, Mohhamad Bagher Dept. of Medical Parasitology and Mycology - School of Public Health - Tehran University of Medical Sciences, Tehran, Iran , MESDAGHINIA, Alireza Dept. of Environmental Health Engineering - School of Public Health and Institute of Public Health Research - Tehran University of Medical Sciences, Tehran, Iran , SALAHI MOGHADDAM, Abdoreza Dept. of Pathobiology - Bandar Abbas Faculty of Medicine - Hormozgan University of Medical Sciences (HUMS), Iran , HOSSEINI, Mostafa Dept. of Epidemiology and Biostatistics - School of Public Health - Tehran Univer, Tehran, Iranity of Medical sciences , RAKHSHANPOUR, Arash Dept. of Medical Parasitology and Mycology - School of Public Health - Tehran University of Medical Sciences, Tehran, Iran , MOWLAVI, Gholamreza Dept. of Medical Parasitology and Mycology - School of Public Health - Tehran University of Medical Sciences, Tehran, Iran
Abstract :
Background: The aim of the present study was to evaluate the capability of helminths to absorb heavy metals in comparison with that of the host tissues.
Methods: We compared the concentration of cadmium (Cd) and chromium (Cr) in urban rats and in their harboring helminthes —Moniliformis moniliformis, Hymenolepis diminuta and larval stage of Taenia taenaeiformis (Cysticercus fasciolaris). The heavy metal absorption was evaluated in 1g wet weight of parasites and tissues digested in nitric acid, using Induc-tivity Coupled Plasma (ICP_OES).
Results: A higher concentration of heavy metals was revealed in the helminths than in the host tissues. Bioconcentra-tion factor (BF= C in parasite/C in tissue) for both Cd and Cr absorption was more than 10-fold higher in M. monili-formis than in the three compared host tissues. The BF of Cd in M. moniliformis compared to the liver, kidney and mus-cle of the host was 9.16, 14.14 and 17.09, respectively. BF in Cr in the same parasite and the same host tissues ranged from 10.67, 7.06 and 4.6. High level of absorption in H. diminuta was significantly likewise; the individual BF of Cd and Cr in H. diminuta compared to the liver, kidney and muscle of the hosts was 4.95, 5.94 and 4.67 vs. 2.67, 11.56 and 5.59. The mean concentration of Cd and Cr in C. fasciolaris was also significantly higher than that in the rat livers (P<0.007 and P<0.004, respectively).
Conclusion: This study claims that parasites of terrestrial animals exposed to heavy metals can be more accurate indi-cators than the host tissues as new environmental monitoring agents.
Keywords :
Helminths , Bioindicators , Heavy metals , Moniliformis moniliformis
