Cytomegalovirus-specific cytotoxic T lymphocytes can be efficiently expanded from granulocyte colony-stimulating factor-mobilized hemopoietic progenitor cell products ex vivo and safely transferred to stem cell transplantation recipients to facilitate immune reconstitution

Uncontrolled cytomegalovirus (CMV) reactivation after allogeneic hematopoietic stem cell transplantation causes significant morbidity and mortality. Adoptive transfer of CMV-specific cytotoxic T lymphocytes (CTLs) is a promising therapy to treat reactivation and prevent viral disease. In this article, we describe the generation of clinical-grade CMV-specific CTLs directly from granulocyte colony-stimulating factor-mobilized hemopoietic progenitor cell (G-HPC) products collected for transplantation. This method requires less than 2.5% of a typical G-HPC product to reproducibly expand CMV-specific CTLs ex vivo. Comparison of 11 CMV CTL lines generated from G-HPC products with 52 CMV CTL lines generated from nonmobilized peripheral blood revealed similar expansion kinetics and phenotype. G-HPC-derived CTLs produced IFN-γ after reexposure to CMVpp65 antigen and exhibited CMV-directed cytotoxicity but no alloreactivity against transplantation recipient-derived cells. Seven patients received CMV-specific CTL lines expanded from G-HPC products in a prophylactic adoptive immunotherapy phase I/II clinical trial. Use of G-HPC products will facilitate integration of CTL generation into established quality systems of transplantation centers and more rapid inclusion of T cell therapies into routine clinical care.

In vitro generation of influenza-specific polyfunctional CD4+ T cells suitable for adoptive immunotherapy

BACKGROUND AIMS

Influenza viruses cause potentially fatal respiratory infections in stem cell transplant patients. Specific T cells provide long-lived host adaptive immunity to influenza viruses, and the potential for generating such cells for clinical use was investigated.

METHODS

The inactivated influenza vaccine (Fluvax) approved for human use was used as the antigen source. Monocyte-derived dendritic cells pulsed with Fluvax were used to stimulate autologous peripheral blood mononuclear cells (PBMC) on days 0 and 7. Cells were expanded with interleukin (IL)-2 from day 7 onwards. Cell numbers and phenotype were assessed on day 21. The presence of influenza virus-specific cells was assessed by cytokine production and proliferative responses following restimulation with influenza antigens.

RESULTS

Over 21 days of culture, a mean fold increase of 26.3 in cell number was observed (n = 7). Cultures were predominantly effector and central memory CD4+ cells, and expressed a phenotype characteristic of activated antigen-specific cells capable of B-cell helper function. Cytotoxic CD4+ and CD8+ cells specific for influenza and a high percentage of CD4+ cells specific for each of three influenza viruses targeted by Fluvax (H1N1, H3N2 and Brisbane viruses) were generated. In addition, T cells expanded when restimulated with antigens derived from influenza viruses.

CONCLUSIONS

We have demonstrated a clinically usable method for producing influenza virus-specific T cells that yield high numbers of highly reactive CD4+ cells suitable for adoptive immunotherapy. We propose that reconstructing host immunity through adoptive transfer of influenza virus-specific T cells will reduce the frequency of influenza-related deaths in the period of severe immune suppression that follows stem cell transplantation.

Prescribing practices of outpatient child psychiatrists

OBJECTIVE

This study was designed to assess outpatient child psychiatrists' prescribing practices.

METHOD

Of 1,422 outpatients in two public, university affiliated settings in New York and Ohio, the charts of 146 medicated and 126 nonmedicated randomly selected patients were reviewed for demographic variables, DSM-III-R diagnoses, medications prescribed, and charted prescription rationales.

RESULTS

Fifteen percent of the 800 outpatients seen in a 1-month period in New York, and 19% of the 626 outpatients seen in a 1-year period in Ohio were prescribed medication. Patients medicated by clinic psychiatrists were significantly more likely than nonmedicated patients to be psychotic and to have been hospitalized previously, and significantly less likely to have adjustment disorder. Using standards employed by drug utilization review committees, medications were prescribed appropriately in approximately 90% of cases. Of concern, 65% of patients given antipsychotics in New York and 67% in Ohio were not psychotic; the primary target symptom in such cases was aggression.

CONCLUSIONS

Prescribing practices appeared to be appropriate, although the use of antipsychotic medications in nonpsychotic children is a concern for the field of child psychiatry. The strong similarity of practices in two independent and geographically remote sites suggests the findings are generalizable to providers in other public, university affiliated settings.