Thèse--Univ de Toulouse. / Description based on print version record. "Bibliographie"; p. [1] at end.

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This thesis investigates the expression of a T-cell differentiation antigen, (XTLA- 1), in various strains and species of Xenopus, and demonstrates the effect of early-thymectomy, (by microcautery), on XTLA-1 expression. It further examines restoration of the T-cell dependent immune system, (particularly with respect to transplantation responses), and the extent to which tolerance to donor antigens is achieved by implantation of xenogeneic, as well as allogeneic, thymi into early- thymectomised Xenopus larvae. The means by which transplantation tolerance is maintained in intact, control Xenopus, following perimetamorphic skin grafting, is also addressed. Initial work, reported in Chapter 2, showed that XTLA-1 is expressed by the majority of thymocytes and by a proportion of splenocytes from all X.laevis, X.borealis, and hybrid clonal Xenopus,(X.laevis x X.gilli and hybrid X.laevis x X.muelleri),examined. X.tropicalis lymphocytes, however, do not express XTLA- 1. Early-thymectomy by microcautery effectively removes T-cells, as detected by XTLA-1 expression. In Chapter 3, normal adult and larval tissue distribution of XTLA-1 positive cells is described, and the XTLA-1 and X.borealis,(quinacrine fluorescence), markers are employed to demonstrate the differentiation of T-cells derived from early- thymectomised hosts within xenogeneic, (X.tropicalis), thymus implants. The effects of implantation of allogeneic and xenogeneic larval thymi into early-thymectomised hosts, in terms of T-cell responses and of induction of tolerance to thymus donor antigens, is explored in Chapter 4; X.borealis xenogeneic thymus implants are apparently as effective in these regards as are allogeneic implants, but X.tropicalis xenogeneic thymus implants do not fully restore thymus-dependent immune responses. Preliminary investigations of skin graft rejection, mixed leukocyte culture and T-cell mitogen responses of X.tropicalis, in comparison to those of other Xenopus species, are reported in Chapter 5; the results of these experiments raise the possibility that X.tropicalis splenocytes are less responsive, in mixed leukocyte culture, to xenogeneic stimulators than are splenocytes of other Xenopus species. In Chapter 6, histological examination of skin grafts, accepted by virtue of the tolerance induced by prior implantation of a thymus gland from the skin graft donor into the early-thymectomised hosts, reveals some rapid alteration in the composition of these skin grafts; infiltration of the tolerated skin grafts by host-derived lymphocytes suggests that tolerance induced by thymus implantation does not abrogate recognition of thymus donor antigens. Finally, also in Chapter 6, tolerance induced in control, intact Xenopus by perimetamorphic skin grafting is shown to be susceptible to cyclophosphamide injection, suggesting that the maintenance of this tolerance is mediated by suppressor cells.

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

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Call number: LD2668 .T4 1960 P54

Call number: LD2668 .T4 1961 D43

A dissertation submitted to the Faculty of Science University of the Witwatersrand, Johannesburg for the Degree of Master of Science. Johannesburg 1992 / 1. Beder, J.B. Thornley, A.L. and Veale.R, Human keratinocyte culture techniques using foetal, neonatal and adult keratinocytes with particular reference to extensive bum wounds. This paper was presented at the South African Burn Society Biannual Congress held at Berg en Dal, Kruger National Park, from 31 August to 1 September 1989. 2. Beder, J.B., Thornley, A.L. and Veale, R. Human keratinocyte culture techniques in extensive burn wounds. The Journal of Trauma and Emergency Medicine. 1990 Jan/Feb; 7 (1); 29-32. 3. Beder J.B. Cultured allografts. A letter appearing in the Continuing Medical Education Journal (CEM). 1990 Jan; 8(1): 48. 4. Beder, J.B. Problems and attempted solutions associated with the application of cultured epidermal grafts to full thickness burns in extensively burnt patients. This paper was presented in the form of a poster at the Association of Surgeons of South Africa Biannual Congress held in Bloemfontein from May 1-4 1990. 5. Beder, J.B., Thornley, A.L., Veale R., Kadwa, A.M., Scott, E. Healing chronic leg ulcers cultured keratinocyte allografts. This paper was presented at the annual Congress of The Surgical Research Society of Southern Africa held in Bloemfontein from 29 April to 1 May 1990. This paper was the runner-up for the best paper presented at the above congress. 6. The abstract of the paper mentioned in 5. above was published in the South African Journal of Surgery 1990 Sep; 28 (3): 123. 7. Beder, J.B., Healing full thickness burns with various types of cultured epidermal grafts - a comparative study. This paper was presented at the Z4th annual meeting of the British Burn Association held at the post-graduate centre, Stock Mandeville, Aylesbury, Bucks. England, United Kingdom, on the 10th May 1991. 8. Beder, J.B, J.B. A comparative study of various keratinocyte cell lines used in the synthesis of confluent stratified keratinocyte sheets. This paper was presented at the skin culture meeting, a satellite meeting of the 24th annual meeting of the British Burn Association, held at the post-graduate centre, Stoke-Mandeville, Aylesbury, Bucks, England, United Kingdom, on the 8th May 1991. 9. Beder, J.B. Healing chronic leg ulcers using cultured keratinocyte allografts. This paper was presented at the skin culture meeting of the British Burn Association held at the post-graduate centre, Stoke- Mandeville, Aylesbury, Bucks, England, United Kingdom on the 8th May 1991. 10. Beder, J.B., Thornley, A.L. and Veale, R. Healing chronic ulcers and other skin defects, using cultured keratinocyte allografts - including an assessment of their survival. Submitted for publication to the British Medical Journal. 11. Beder, J.B. The preparation and grafting of cultured epidermal sheets. Submitted for publication to the South African Journal of Surgery. 13. Beder, J.B., Thoenley, A.L. and Veale. R. Healing full thickness burns with cultured epidermal grafts - a comparative study. Submitted for publication to Transplantation.