Clinical Outcome Prediction in COVID-19 Patients by Lymphocyte Subsets Analysis and Monocytes' iTNF-α Expression.

In December 2019, a novel coronavirus, "SARS-CoV-2", was recognized as the cause of coronavirus disease 2019 (COVID-19). Several studies have explored the changes and the role of inflammatory cells and cytokines in the immunopathogenesis of the disease, but until today, the results have been controversial. Based on these premises, we conducted a retrospective assessment of monocyte intracellular TNF-α expression (iTNF-α) and on the frequencies of lymphocyte sub-populations in twenty-five patients with moderate/severe COVID-19. We found lymphopenia in all COVID-19 infected subjects compared to healthy subjects. On initial observation, in patients with favorable outcomes, we detected a high absolute eosinophil count and a high CD4+/CD8+ T lymphocytes ratio, while in the Exitus Group, we observed high neutrophil and CD8+ T lymphocyte counts. During infection, in patients with favorable outcomes, we observed a rise in the lymphocyte count, in the monocyte and in Treg lymphocyte counts, and in the CD4+ and in CD8+ T lymphocytes count but a reduction in the CD4+/CD8+ T lymphocyte ratio. Instead, in the Exitus Group, we observed a reduction in the Treg lymphocyte counts and a decrease in iTNF-α expression. Our preliminary findings point to a modulation of the different cellular mediators of the immune system, which probably play a key role in the outcomes of COVID-19.

CD4+/CD25+ T cells suppress autologous CD4+/CD25- lymphocytes and secrete granzyme B during acute and chronic hepatitis C.

We aimed to verify whether CD4(+)/CD25(+) T cells suppress CD4(+) T cells and secrete Granzyme B (GZB) during acute and chronic hepatitis C (CHC) infection. We enrolled 50 subjects: 20 patients with CHC (Group A), 15 healthy individuals (Group B), 10 patients with acute hepatitis C later evolved to persistent infection (Group C) and five patients who resolved hepatitis C virus infection during acute phase (Group D). We analysed, on enrolled subjects CD4(+)/CD25(+) T cells and related GZB production as well as Annexin V activity. Patients from Groups A and C had higher frequency and function of peripheral Treg cells than healthy individuals. Groups A and C showed an increase in spot-forming colonies (SFCs) of GZB compared with Group B (P < 0.01, Mann-Whitney U-test). CD4(+)/CD25(+) T cells in Group D had a lower number of GZB SFCs compared with Groups A and C but higher number than Group B (P < 0.01 Mann-Whitney U-test). Annexin V production was higher in Groups A and C than B or D. Patients having acute and chronic hepatitis C have a higher Treg frequency and function in peripheral blood than healthy controls or those resolving the infection in acute phase secreting GZB, probably inducing apoptosis.

Endometrial polyps in infertile patients: do high concentrations of interferon-gamma play a role?

OBJECTIVE: To assess levels of interferon-gamma (IFN-γ) both in serum and in endometrial biopsy samples from infertile patients with endometrial polyps, to investigate the molecular background involved in the formation of endometrial polyps and its potential role in infertility. DESIGN: Prospective controlled trial. SETTING: Academic infertility clinic. PATIENT(S): Twenty-one infertile women affected by endometrial polyposis represented the study group, and 21 homogeneous women without endometrial polyps were enrolled as control subjects. INTERVENTION(S): Blood and endometrial biopsy collection from infertile women with and without endometrial polyps. MAIN OUTCOME MEASURE(S): IFN-γ-positive cells were analyzed and counted as spot-forming colonies. RESULT(S): IFN-γ levels were significantly higher both in serum and in tissue biopsies of women with endometrial polyps. CONCLUSION(S): High concentrations of IFN-γ were detected in infertile patients with endometrial polyps. The possible role of an inflammatory factor in a proliferative pathology represents a novel insight into the understanding of endometrial polyposis and its relationship with infertility.

Evidence of hepatitis C virus-specific interferon gamma-positive T cells in health care workers in an infectious disease department.

BACKGROUND: Few studies are available on possible hepatitis C virus (HCV)-specific T-cell immune response in health care workers (HCWs) involved in the care of patients with HCV infection. We aimed to investigate whether a HCV-specific interferon (IFN)-gamma T-cell response, known to be involved in infection resolution, was present in those HCWs involved in the management of patients with persistent HCV infection. METHODS: Our study involved 30 subjects, classified as group A (20 consecutive patients, 16 males and 4 females, with histologically proven chronic hepatitis), or group B (10 HCWs, 7 males and 3 females, with at least 7 years of health care experience and HCV-RNA and anti-HCV negative). As a control group, we used 10 blood samples from healthy donors at a blood donor center (group C). HCV-RNA was measured by real-time polymerase chain reaction. Blood samples (at least 35 mL) were collected from all group A and group B subjects in our hospital. Specific IFN-gamma was stimulated with HCV pool peptides (core, 2 microg/mL), with influenza Mp peptides used as a positive control. RESULTS: Levels of HCV-specific IFN-gamma-positive cells were higher in the HCWs (group B) compared with the infected patients (group A) and healthy blood donors (group C) (Mann-Whitney U test, P < .001). CONCLUSION: A clinically silent persistent exposure to HCV, through some as-yet undetermined mechanism, may induce a virus-specific IFN-gamma-producing CD8(+) T-cell response in healthy aviremic HCWs. This finding suggests that possible unapparent parenteral routes may stimulate host defenses with no evidence of hepatitis.

Increase of granzyme B-positive cells in ascitic fluid of patients with spontaneous bacterial peritonitis.

Spontaneous bacterial peritonitis (SBP) occurs as a direct consequence of bacteria entering ascitic fluid (AF) from the intestinal lumen trough in several ways, including the hematogenous and mesenteric lymph nodes route. There are few studies on the cytokine profile of ascitic-derived mononuclear cells of patients with SBP, particularly on granzyme B (GZB). The aim of the present study was to verify whether patients with SBP have GZB-positive cells, whether they are increased in patients with aseptic ascites, and their trend after antibiotic treatment. We enrolled 36 consecutive patients (24 males and 12 females) with SBP on histologically-proven hepatitis C virus cirrhosis (group A) and 20 patients (11 males and nine females with ascites, but without evidences of SBP (group B). The diagnosis of SBP was made according to the following criteria: positive colture in AF or blood (at least two cultures) and neutrophils in AF (>250 mL polymorphonuclear leukocytes). For these patients we used ELISpot to assay GZB production on purified mononuclear cells in ascitesand peripheral blood, coupled with tumor necrosis factor-alpha tested using ELISA. A non-parametric statistical analysis was used to assess significant differences and correlations. We found positive culture in all of the patients with SBP (80% Escherichia coli; 20% Enterococcus faecium). Furthermore, the patients in group A had a higher number of GZB spot-forming colonies than the patients in group B (P < 0.001). GZB-positive cells were lower in the peripheral blood than those found in the AF of patients with SBP, while no differences were found between blood and AF in group B. Furthermore, after antibiotic treatment, GZB was reduced in the patients with SBP (P < 0.05). In conclusion, GZB may be an important mediator of the immune response towards bacteria in AF and could be used as a diagnostic tool.