not sure about that - aren't NK cells part of the innate immune system
while antibodies are made by the cells in the adaptive immune response?
in case its of interest - low NK cells and low IGG subclasses are associated with chronic lyme disease
a subset of NK cells called CD57+ cells in particular are thought to be highly associated with lyme disease and recovery of this cell count to normal range is though to precede recovery/remission. its used as a kind of supplemental diagnostic test and to evaluate treatment progress for this reason.
anecdotally - several people in the lyme forum i am a member of have low NK cells and v low CD57+ counts and some also have low IGG subclasses - most have counts that have stayed low when serially tested - rather than recovered - but they are also still on the forum - and mostly still sick
its documented in the scientific literature that the organism that causes lyme disease is known to infect and disrupt the functioning of germinal centres in the lymph nodes - which is where the body learns what pathogens are being encountered by the innate immune system - and decides what antibodies to make in response, to fight a given infection. This happens very shortly after initial infection - its thought that this is one of the reasons why some people never make expected antibodies to the organism.
i would have to double check - but NK cells may be one of the cell types that take the message to the germinal centres to teach the B cells what antibodies to make
immunoglobulins ( IgA, IgG etc ) are basically antibodies
