Currently, reports in other organ systems show that baseline levels of cell fusion are relatively non-detectable [11], [12], [33].
Here, we report considerable baseline levels of cell fusion in the intestine under homeostatic conditions, greater than that reported in other organ systems [1], [11], [22].
As expected, vector alone and V2Nter showed baseline levels of cell death in HCT116 and HepG2 cells (Figure 3, D and E).
The homeostatic, or baseline, levels of cell fusion observed in both transplanted mice with suppressed inflammation and parabiotic mice may be due to the intrinsic proliferative nature of the intestinal crypt.
In this report we demonstrate that the transgenic expression of VILIP-1 targeted to the epidermis is able to decrease the baseline levels of cell proliferation and that this downregulation of epidermal proliferation is also very evident after short term treatment with the hyperplasiogenic tumor promoter TPA.
In support of a physiologic role for intestinal epithelial cell fusion, an appreciable baseline level of cell fusion was observed in non-DSS treated parabiotic pairs in both the colon (-DSS, 5.8±3.4%, n = 5) and DSI (-DSS, 15.0±3.2%, n = 5) (Figure 2E).
To rule out the possibility of surgically-induced inflammation that could potentially create an artificial baseline level of cell fusion within the intestinal epithelium, we repeated the parabiotic experiment by joining GFP and ROSA mice along with oral administration of an anti-inflammatory drug cocktail during and after the surgery (Figure 2A).
In these animals, the baseline level of cell fusion persisted and was unchanged relative to the untreated animals in both the colon (5-ASA treated: 5.3±2.0%, n = 5, P = 0.895) and DSI (5-ASA treated: 21.3±7.8%, n = 5, P = 0.477) (Figure 2E).
Resveratrol significantly inhibited normoxic stabilization of HIF-1α in M14 and YUZAZ6 cell lines (P = 0.0303 and P = 0.0163 respectively), but did not inhibit the low baseline levels of A375 cell line HIF-1α.
Peripheral blood was obtained to measure baseline levels of immune cell populations, immune-reactivity indices, serum immune biomarkers, and autoantibodies, as well as for biochemistry and hematology evaluation.
It is possible that the differences in ART uptake noted between the intervention and control site might have been due, in some part, to differences in baseline levels of CD4 cell count between participants in these areas.
