Appearance and histopathological examination of the blood deficiency model rats
The appearances of rats were changed after given APH and CTX. As showed in Fig. 1, the rats in the control group appeared to be in a good condition; their ears, noses, faces and tails were pink, and their hairs were tight and glossy. However, the rats in the model group appeared to be in a bad condition; their hairs were fluffy and shed easily, and their ears, noses, faces and feet were pale. Especially the ears of the model group were easily observed. After administration, the above features of the rats in the FEJ, MJ-H, MJ-M and MJ-L groups were similar to those in the control group. Among those, the MJ-H was the closest.
Histopathological changes of spleen sections were observed and evaluated by HE staining (Fig. 2). The spleen tissues in the rats of the control group showed a normal spleen architecture clearly with regular distribution of red pulps (RP) and white pulps (WP), tight arrangement of lymphocytes and no obvious existence of segmentation and differentiation. In contrast, the structure of white pulps in splenocytes of the model group were destroyed. Crypta (CR) was increased and lymphocytes were decreased. In the FEJ (6ml/kg) treatment group, the rats appeared to be better, with less connective tissue and more lymphocytes. These characteristics of rats in the model group were also observed after treatment with MJ (10ml/kg, 5ml/kg or 2.5ml/kg), but they were significantly improved compared with those in the model group.
Effects of MJ on peripheral routine blood and visceral index of the blood deficiency model rats
The indexes of peripheral routine blood directly reflect the curative effect of replenishing blood. As showed in Table 1, the WBC, RBC, HGB, HCT and PLT levels in the model group were significantly decreased compared with those in the animals in the control group (p < 0.01), suggesting the model was copied successfully. The WBC, RBC, HGB and HCT levels in MJ and FEJ treatment groups showed an obvious increasing trend compared with those in the animals in the model group.
The changes of visceral indexes can be reflected injure and recover of organs in a certain extent. As showed in Table 2, the liver index, thymus index and spleen index in rats in the model group were reduced significantly compared with those in the control group (p < 0.01). Compared with the model group, the liver index and spleen index in MJ-treated groups and FEJ showed a decreasing trend and the thymus index in the MJ and FEJ treatment groups showed an obvious increasing trend. The lung index in the control and treatment groups had no statistical difference compared with the animals in the model group.
Effects of MJ on antioxidant activity and lipid peroxidation of the blood deficiency model rats
The indicators of antioxidant capacity and lipid peroxidation mainly include SOD, T-AOC and MDA. As showed in Table 3, the activity of T-AOC presented a significant increase in rats in the control group and the blood deficiency model rats treated with MJ or FEJ compared with the animals in the model group (p < 0.05). In addition, the level of MDA in the animals in the model group was significantly decreased compared with those in the control group (p < 0.01). Compared with model group, the levels of MDA in the animals in the MJ-H, MJ-M and FEJ groups were reduced significantly (p < 0.05), but in the MJ-L group there was little impact on this parameter. The activity of SOD in the rats in the model group showed a little decrease compared with the other groups, but this was not statistically significant.
Effects of MJ on apoptosis regulatory proteins and hematopoietic growth factors in spleen tissues of blood deficiency model rats
Bcl-2 and Bax are two proteins that play important roles in regulating cell apoptosis. In this study, we found that the expression levels of Bcl-2 and Bax, and the Bcl-2/Bax ratio decreased significantly (p < 0.05) in blood deficiency model rats that was induced by APH and CTX. After the administration of MJ and FEJ, Bcl-2 expression level and the Bcl-2/Bax ratio of the animals in the FEJ, MJ-H and MJ-M groups increased significantly (p < 0.05); however Bax expression level of FEJ and MJ-H groups increased significantly (p < 0.05) compared with that in the model group (Fig. 3).
In present study, we detected the EPO level in spleen tissues of blood deficiency model rats, and the results are showed in Fig. 4. The EPO level in the model group was decreased significantly (p <0.01) compared with in the control group. However, the EPO level of the FEJ and MJ-H groups was increased significantly (p <0.05), and the EPO level of MJ-M and MJ-L groups was also shown an increasing trend compared with in the model group.
M-CSF and TGF-β1 are two important cytokines in promoting hematopoiesis. Here, we determined and compared the M-CSF and TGF-β1 mRNA levels in spleen tissues of blood deficiency model rats (Fig. 5). Compared with the control group, the M-CSF mRNA level in the other groups was decreased significantly (p<0.05), but the TGF-β1 mRNA level in the model group was increased significantly (p<0.05). Compared with animals in the model group, the M-CSF mRNA level in FEJ and MJ-H groups was increased significantly (p<0.05), but the TGF-β1 mRNA level in FEJ and MJ-H groups was decreased significantly (p<0.05). These results demonstrated that MJ could regulate hematopoiesis via M-CSF and TFG-β1, with similar effect as FEJ if MJ dose is high.