There are many possible pathways that could be affected by this interaction, including regulation of GIRK channels [25] and signaling through PKC [26] or through the beta-gamma subunit of heterotrimeric G-proteins [27] or acetylcholinesterase [16].
Three hydrogen bonds may form to stabilize this interaction, including from N7 of A to H22 of G and from two amino protons of A to O2 and O2′ of C, respectively.
Several epidithiodiketopiperazine (ETP) compounds have been found to inhibit this interaction, including the fungal natural products chaetocin and chetomin, as well as the synthetic ETP 3 (see Figure 18).
Elements of this interaction include the magnitude of the mask leak, the point at which the ventilator terminates inspiratory pressure application, and the rate at which the circuit is pressurized [ 6- 9].
Several potential biological mechanisms have been proposed for this interaction, including nicotine causing DNA damage in the cervix and chemical modulation of immune response to HPV (Castellsagué et al. 2002; Gunnell et al. 2006).
Examples of this interaction include the following: (i) adherence to host cells; (ii) invasion of the cell to which there was compliance; (iii) damage to host tissues; (iv) resistance from the defense machinery of the cells to environmental stress; and (v) mechanisms for subversion of the host's immune response [ 9, 10].
Finally, further support for the key role of T-cell abnormalities and B-cell/T-cell collaboration in the pathogenesis of SLE is provided by a number of genetic variants associated with human lupus that appear to affect this interaction, including PTPN22.
The major surface molecules of Leishmania that may also participate in this interaction include gp63 or promastigote surface protease (PSP), the primary parasite surface protein; lipophosphoglycan (LPG), the main promastigote glycoconjugate; and glycosyl inositol phospholipids (GPIs), which are present in large numbers in both promastigotes and amastigotes [ 18].
