that's pretty close, ww, well done! but not quite the one i remember. maybe if i throw that in pubmed and check out related studies it'll come up.
but yes it's getting at similar stuff, basically this is the kind of info that makes me think of 1,25dihydroxycholecalciferol as part of the immune system's 'brakes'. if you don't have enough 25(OH)D3 you don't have good stores for building 1,25dihydroxycholecalciferol, so if the immune system says 'attack' there's not enough 'stop attacking' messaging going on at the same time.
"macrophages can produce 1,25(OH)2D3 on activation with interferon (IFN-)"
"1,25(OH)2D3 can selectively suppress key effector functions of IFN-–activated macrophages"
"production of 1,25(OH)2D3 by IFN-–stimulated macrophages might be an important negative feedback mechanism to control innate and inflammatory responses of activated macrophages"
my approach: no meds so far - just nutrient-dense anti-inflammatory whole foods, and supplements where needed
info: www.whfoods.com, www.nutritiondata.com