Liposomal Clodronate For Treating Autoimmune Hemolytic Anemia

By Roxanne Cruz


Liposomal Clodronate is lately used in many medical researches, mainly as a treatment for autoimmune hemolytic anemia, also known as AIHA. Although some other methods proved to be useful as well, especially splenectomy and the use of corticosteroids, this method could be very useful for achieving good results in significantly shorter period of time.

Clodronate was successfully used for treating bone diseases, but it become very interesting lately for depleting macrophages. Macrophages are destroying red blood cells, and they can be destroyed very effectively using this method. In fact, macrophages actually destroy themselves, and the results last for about one week. His gives a chance to other drugs.

Although clodronate itself wouldn't be able to successfully pass through all cell membranes, using liposomes as the vehicles efficiently solves this problem. Macrophages eagerly eat those liposomes, filling their cells with encapsulated clodronate, until the critical concentration is reached. At this point, they simply destroy themselves.

This drug itself is not toxic, and when it is finally released from those dead macrophage cells, it has very short half-life in the circulation. This means that it will soon be completely removed from the organism by the renal system. Specificity of this method is that these ingredients give very quick results. This is especially important in cases where it is necessary to get a quick response to therapy.

In order to be useful, liposomal clodronate has to reach the infected organs. It cannot cross capillary walls. Until now, this method proved to be useful for depleting macrophages in liver, lymph nodes, lung, joints and other organs, including testis and peritoneal cavity. For achieving expected results, the drug has to be adequately administered.

This method was designed for destroying macrophages in vivo. Although it can be used in in vitro research as well, the problem is that it cannot be removed from the medium so effectively this way. It means it could be accumulated in different cells, and affect your final results. In living organism, it is successfully removed once in circulation, because the kidneys take very good care about it.

The suspension should be stored at 4 degrees Celsius, and it should never be frozen, or heated above 30 degrees Celsius. It should be gently shaken or stirred before injecting it, to get an even distribution of liposomes over the entire suspension, because liposomes tend to precipitate. It is especially important to leave the mixture on room temperature long enough to get the opportunity to reach it before injection.

Although the concentration you use can vary, it shouldn't extend 0,1 ml for 10 g of body weight, at least not for intravenous application. Targeted intraperitoneal application can involve larger concentration. In any case, the suspension concentration is depending on the drug solubility.

Liposomal clodronate therapy will effectively destroy macrophages. The absence of macrophages may cause an increase in e. G., virus titers, bacteria or yeasts. Test animals should always be perfectly clean where injected, to avoid possible microbial contamination. You should always shake the syringe, to get a homogeneous suspension, especially if you use the same one on all your test animals, which is not recommended.




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