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DNA synthesis and adenosine(S')tetraphosphate(S ')adenosine (Ap.A) levels decrease in cells treated with EDTA. The inhibitory effect of EDTA can be reversed with micro molar amounts of ZnCI2• ZnCh in micromolar concentrations also inhibits Ap.A hydrolase and stimulates amino acid-dependent Ap.A synthesis, suggesting that Zn2+ is modulating intracellular Ap.A pools. Serum addition to GI-arrested cells enhances uptake of Zn, whereas serum depletion leads to a fivefold decrease of the rates of zinc uptake. These results are discussed by regarding Zn2+ as a putative 'second messenger' of mitogenic induction and Ap.A as a possible 'third messenger' and trigger of DNA synthesis.
A virus derived from cells of a Iymphoblastoid line originating from the lymph node of a healthy African green monkey was characterized as a typical member of the foamy virus subgroup of rctroviridac by its morphological, physicochemical, biological and biochemical properties (reverse transcriptase actvity). Besides the usual host range of foamy viruses, the isolated strain revealed a remarkable T -lymphotropism, distinguishing it from the prototypes of foamy viruses previously isolated from African green monkeys. Two foamy virus infectious are demonstrated in human contacts of the African green monkey colony, with the animal barbauring the isolate.