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Arrest of in vitro T cell differentiation of normal bone marrow-derived CD34+ stem cells with thymic epithelial fragments from children with AIDS.
Stem Cells. 1996 Sep; 14(5):533-47.SC

Abstract

A novel approach is presented to assess the ability of thymic tissues obtained from children with end stage AIDS to attract normal bone marrow (BM)-derived CD34+ (lineage negative) stem cells (SCs) and support lymphopoiesis in vitro. Chemokinesis of BM-derived CD34+ SCs was analyzed by time-lapse videomicroscopy to ascertain whether an alteration in SC motility could contribute to abnormal thymopoiesis under conditions of HIV infection. The migration of SCs derived from an HIV+ donor into thymic tissue was not significantly altered compared to normal controls, as were normal SCs migrating toward thymic epithelial cell monolayers derived from an HIV+ patient. Thymic tissue obtained from children with AIDS contained nests of CD34+ SCs identified by immunofluorescence, indicating SC homing to the thymus is apparently supported in HIV infection. The ability of HIV-affected thymic epithelial fragments to support lymphopoiesis was determined by examining the initial thymocyte populations present, compared to thymocytes produced de novo in T cell-depleted thymic fragments, following a single pulse of lineage negative CD34+ CD38- SCs. In comparison to normal controls, thymocytes derived from the HIV-affected thymic epithelial fragment coculture had an increased percentage of triple negative thymocytes (28% of lymphocytes from HIV-affected tissue versus 1.5% in controls, p < 0.01) and a decreased percentage of double and single positive CD4+ thymocytes. However, CD3+CD8+ TCR alpha beta + expression was comparable to control cultured thymic epithelial fragments indicating that HIV-affected thymic epithelia were capable of supporting the development of the CD8+ lineage. In an effort to extend the information obtained to date from the histological examination of HIV-affected thymic tissue, select patient thymic tissues were maintained in culture to evaluate the capacity of undifferentiated thymic epithelial cell guirlandes to differentiate in vitro. A partial regeneration of certain subpopulations of the thymic epithelium defined by TE-4 monoclonal antibody (mAb) and CDR2 mAbs occurred during the in vitro culture. The epithelial and mesenchymal components of thymic tissues were distinguished by immunostaining for keratins (indicative of epithelium) and vimentin (a mesenchymal marker). Further evaluation of the modulation of HIV thymus, with respect to the testing of new therapeutic strategies on SCs, will be possible with this in vitro model.

Authors+Show Affiliations

Pediatric Research Institute, Saint Louis University School of Medicine, Missouri, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

8888494

Citation

Ruiz, M E., et al. "Arrest of in Vitro T Cell Differentiation of Normal Bone Marrow-derived CD34+ Stem Cells With Thymic Epithelial Fragments From Children With AIDS." Stem Cells (Dayton, Ohio), vol. 14, no. 5, 1996, pp. 533-47.
Ruiz ME, Freeman J, Bouhasin JD, et al. Arrest of in vitro T cell differentiation of normal bone marrow-derived CD34+ stem cells with thymic epithelial fragments from children with AIDS. Stem Cells. 1996;14(5):533-47.
Ruiz, M. E., Freeman, J., Bouhasin, J. D., Knutsen, A. P., & Hendrix, M. J. (1996). Arrest of in vitro T cell differentiation of normal bone marrow-derived CD34+ stem cells with thymic epithelial fragments from children with AIDS. Stem Cells (Dayton, Ohio), 14(5), 533-47.
Ruiz ME, et al. Arrest of in Vitro T Cell Differentiation of Normal Bone Marrow-derived CD34+ Stem Cells With Thymic Epithelial Fragments From Children With AIDS. Stem Cells. 1996;14(5):533-47. PubMed PMID: 8888494.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Arrest of in vitro T cell differentiation of normal bone marrow-derived CD34+ stem cells with thymic epithelial fragments from children with AIDS. AU - Ruiz,M E, AU - Freeman,J, AU - Bouhasin,J D, AU - Knutsen,A P, AU - Hendrix,M J, PY - 1996/9/1/pubmed PY - 1996/9/1/medline PY - 1996/9/1/entrez SP - 533 EP - 47 JF - Stem cells (Dayton, Ohio) JO - Stem Cells VL - 14 IS - 5 N2 - A novel approach is presented to assess the ability of thymic tissues obtained from children with end stage AIDS to attract normal bone marrow (BM)-derived CD34+ (lineage negative) stem cells (SCs) and support lymphopoiesis in vitro. Chemokinesis of BM-derived CD34+ SCs was analyzed by time-lapse videomicroscopy to ascertain whether an alteration in SC motility could contribute to abnormal thymopoiesis under conditions of HIV infection. The migration of SCs derived from an HIV+ donor into thymic tissue was not significantly altered compared to normal controls, as were normal SCs migrating toward thymic epithelial cell monolayers derived from an HIV+ patient. Thymic tissue obtained from children with AIDS contained nests of CD34+ SCs identified by immunofluorescence, indicating SC homing to the thymus is apparently supported in HIV infection. The ability of HIV-affected thymic epithelial fragments to support lymphopoiesis was determined by examining the initial thymocyte populations present, compared to thymocytes produced de novo in T cell-depleted thymic fragments, following a single pulse of lineage negative CD34+ CD38- SCs. In comparison to normal controls, thymocytes derived from the HIV-affected thymic epithelial fragment coculture had an increased percentage of triple negative thymocytes (28% of lymphocytes from HIV-affected tissue versus 1.5% in controls, p < 0.01) and a decreased percentage of double and single positive CD4+ thymocytes. However, CD3+CD8+ TCR alpha beta + expression was comparable to control cultured thymic epithelial fragments indicating that HIV-affected thymic epithelia were capable of supporting the development of the CD8+ lineage. In an effort to extend the information obtained to date from the histological examination of HIV-affected thymic tissue, select patient thymic tissues were maintained in culture to evaluate the capacity of undifferentiated thymic epithelial cell guirlandes to differentiate in vitro. A partial regeneration of certain subpopulations of the thymic epithelium defined by TE-4 monoclonal antibody (mAb) and CDR2 mAbs occurred during the in vitro culture. The epithelial and mesenchymal components of thymic tissues were distinguished by immunostaining for keratins (indicative of epithelium) and vimentin (a mesenchymal marker). Further evaluation of the modulation of HIV thymus, with respect to the testing of new therapeutic strategies on SCs, will be possible with this in vitro model. SN - 1066-5099 UR - https://www.unboundmedicine.com/medline/citation/8888494/Arrest_of_in_vitro_T_cell_differentiation_of_normal_bone_marrow_derived_CD34+_stem_cells_with_thymic_epithelial_fragments_from_children_with_AIDS_ L2 - https://doi.org/10.1002/stem.140533 DB - PRIME DP - Unbound Medicine ER -