Liver Histophatological Studies of Mice (Mus musculus sp.) Infected With Gamma Rays Irradiated Plasmodium berghei Strains Anka

Malaria is a serious global disease and a leading cause of morbidity and mortality in tropical and sub-tropical
countries. Radiation attenuated vaccines have been demonstrated to be an effective means of controlling certain
parasitic infections such as malaria. Our previous research showed that irradiation dose of 150-175 Gy to
Plasmodium berghei were enable to suppress the infected erythrocyte cells and irradiation dose at 150 Gy was
more effective compared to 175 Gy in attenuate the parasites based on parasitemia index. Aim of this research
was to investigate the most suitable irradiation dose to attenuated P. berghei based on the the histological
changes in the liver mouse malaria model. Histological changes in mice liver because of Plasmodium is congestion
in the sinusoids and masses of hemozoin. Fourty Swiss mice were randomly assigned to four equal groups. First
group of mice were inoculated with the unirradiated malaria parasites as a positive control while negative
control group represented uninfected normal control. The third group of mice was inoculated with the irradiated
malaria parasites with dose 175 Gy. Last group were inoculated with the irradiated malaria parasites with dose
150 Gy. Mice were sacrificed at day 6, 8, 12, 16, 20, and 24 post inoculation for liver histological study. Their livers
processed for histomorphometric assessment of sinusoidal area, haemozoin area and hepatosomatic index as a
quantitative measure of altered morphology. Hepatic sinusoidal area in mice infected with the unirradiated
malaria parasites increased by 104% in day 24 post inoculated compared to day 6 post inoculated, whereas a
smaller increase of 46% occurred in mice that were inoculated with the irradiated malaria parasites with dose
150 Gy. The difference between positive control and 150 Gy group was significant (P < 0.05). The highest average
haemozoin area in all days post inoculation was in positive control whereas a smaller occurred in mice that were
inoculated with the irradiated malaria parasites with dose 175 Gy, but the different was not significant (P > 0.05).
For hepatosomatic index (HSI) at day 24 post inoculation the HSI value in group 150 Gy (5.33) was the smallest
compared to other groups. Based on our research it can be concluded that irradiation dose at 150 Gy was more
effective compared to 175 Gy in attenuate the parasites based on assessment of sinusoidal area, and HSI value at
24 day post inoculation