Open AccessVariations in cytotoxicity and isoenzyme patterns of uncloned and cloned cultures of axenic Entamoeba histolytica
Author(s) -
Romana Sarabjit,
Mehta S.K.,
Vinayak V.K.
Publication year - 1991
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1991.tb04200.x
Subject(s) - entamoeba histolytica , axenic , clone (java method) , cytotoxic t cell , biology , axenic culture , microbiology and biotechnology , population , biochemistry , genetics , gene , bacteria , in vitro , medicine , environmental health
Summary Five clones of axenic Entamoeba histolytica (HMI) grown as discrete colonies in semisolid agar medium were adapted in liquid medium and labelled as HMI‐C121, HMI‐C131, HMI‐C143, HMI‐C144 and HMI‐C145. The clone HMI‐C121 was more cytotoxic to the cultured Baby Hamster Kidney (BHK) cells while all other clones were significantly ( P < 0.001) less cytotoxic as compared to the cloned HMI‐C121 and uncloned E. histolytica (HMI). The uncloned Indian axenic E. histolytica (KCG:0986:11) as well as E. histolytica (NIH: 200) cultures were significantly ( P <0.001) less cytotoxic to cultured BHK cells. No difference in the electromobility of maleate NADP oxidoreductase (ME) or glucophosphate isomerase (GPI) isoenzyme in the lysates of all the cloned and uncloned cultures of E. histolytica was observed. The clones HMI‐C121, HMI‐C131, HMI‐G143 and HMI‐C144 had three bands of hexokinase (HK) while all uncloned cultures and one of clones, HMI‐C145 had only two bands. Though cloned and uncloned cultures had a single PGM band, the relative electromobility (rf) of phosphoglucomutase (PGM) for clone HMI‐C131, HMI‐C143 HMI‐C144 was relatively less (rf 0.075) and these were also significantly ( P < 0.001) less cytotoxic to BHK cells as compared to clone HMI‐C121. It is felt that axenic E. histolytica culture consists of several populations (clones) and expression of isoenzymes pattern or cytotoxic potentials would depend upon the population which predominantly multiples and outgrows other populations in the culture system.