One of the purposes of macrophages is to remove detrimental chemicals, etc from the body and store or protect them that they are no longer able to exert a negative systemic influence. I would include the storing portion. Points should go to David, however, for finding the articles in the first place. I searched high and low, but could not come up with a "fachspezifisches" term for this. My guess is that it is descriptive because I reviewed a number of classification systems and none of them contained this term. I think it is meant functionally and would translate it thus.