scholarly journals STUDIES ON CHARACTERIZATION OF THE LYMPHOID TARGET CELL FOR ACTIVITY OF A THYMUS HUMORAL FACTOR

1973 ◽  
Vol 138 (1) ◽  
pp. 130-142 ◽  
Author(s):  
Varda Rotter ◽  
Amiela Globerson ◽  
Ichiro Nakamura ◽  
Nathan Trainin
Keyword(s):  
Bone Marrow ◽  
Bone Marrow Cells ◽  
Cell Activity ◽  
Humoral Factor ◽  
Target Cells ◽  
Total Body ◽  
Thymus Cells ◽  
Marrow Cells

The immune response to SRBC was measured in the spleens of adult thymectomized, total body irradiated mice injected with various combinations of thymus and bone marrow cells together with thymic humoral factor (THF). It was found that the number of plaque-forming cells was significantly increased when THF was given in vivo immediately after thymus cell administration or when thymus cells were incubated in THF before injection. On the other hand, bone marrow cells equally treated did not manifest any T cell activity, since THF-treated bone marrow cells were not able to substitute thymus cells in the system used. The results accumulated in the present experiments indicate, therefore, that the target cells for THF activity are thymus cells which acquire a higher T helper cell capacity after THF treatment.

Live Attenuated Salmonella Carrying Platelet Factor 4 cDNAs as Radioprotection and Anti-Tumor Angiogenesis Agents.

Blood ◽  
2004 ◽  
Vol 104 (11) ◽  
pp. 3178-3178
Author(s):  
Zhong Chao Han ◽  
Bin Liu ◽  
Lihua Zhao
Keyword(s):  
Gene Therapy ◽  
Bone Marrow ◽  
Bone Marrow Cells ◽  
Tumor Regression ◽  
Platelet Factor 4 ◽  
Platelet Factor ◽  
Delivery Vector ◽  
Total Body ◽  
Marrow Cells

Abstract In cancer therapy, specific radioprotection of normal tissue and antiangiogenesis are the ways to increase the therapeutic gain. Here we describe a novel gene therapy, which uses attenuated salmonella SL3261 as oral vectors carrying with cDNA of platelet factor 4 (PF4) or that of a truncated PF4. After oral administrations of attenuated salmonella carrying with cDNA of PF4 or truncated PF4, the survival rate of mice which received sublethal total body irradiation was improved by 50%, In comparison with the control mice, the bone marrow cells obtained from the mice of experimental group increased (13.2±8.3, 15.7±1.5 vs 4.1 ± 2.0 P<0.05) at day 7 after TBI, and the number of HPP-CFC of bone marrow cells also increased significantly (15.7±9, 11.7±5 vs 4.3±4.1 P<0.05) at day 7, suggesting a stimulating effect of PF4 on hematopoietic recovery. This gene therapy also caused significant tumor regression. The microvessel density (MVD) of tumors was significantly decreased in the group of treated mice compared to controls (4.25±0.96, 4.08±0.56 vs 11±0.83 P<0.05). Analysis TUNEL kit revealed an increase in the number of apoptosis cells in tumors of mice treated by SL3261 carrying with cDNA of PF4 or a truncated PF4. GFP expression and gene integration were detected in the liver, kidney, spleens, intestine, peripheral blood, bone marrow and tumors samples of the SL3261 treated mice, and the expression of GFP was higher in tumors than that in other tissues. These data demonstrate for the first time a dual biological function of PF4 against tumor growth and radiation injury. These results also demonstrate that attenuated salmonella can be used in vivo as a DNA delivery vector

scholarly journals CD34+ human marrow cells that express low levels of Kit protein are enriched for long-term marrow-engrafting cells

Blood ◽  
1996 ◽  
Vol 87 (10) ◽  
pp. 4136-4142 ◽  
Author(s):  
I Kawashima ◽  
ED Zanjani ◽  
G Almaida-Porada ◽  
AW Flake ◽  
H Zeng ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Bone Marrow Cells ◽  
Marrow Cell ◽  
In Utero ◽  
Fetal Sheep ◽  
Hematopoietic Stem ◽  
Show Evidence ◽  
Marrow Cells

Using in utero transplantation into fetal sheep, we examined the capability of human bone marrow CD34+ cells fractionated based on Kit protein expression to provide long-term in vivo engraftment. Twelve hundred to 5,000 CD34+ Kit-, CD34+ Kit(low), and CD34+ Kit(high) cells were injected into a total of 14 preimmune fetal sheep recipients using the amniotic bubble technique. Six fetuses were killed in utero 1.5 months after bone marrow cell transplantation. Two fetuses receiving CD34+ Kit(low) cells showed signs of engraftment according to analysis of CD45+ cells in their bone marrow cells and karyotype studies of the colonies grown in methylcellulose culture. In contrast, two fetuses receiving CD34+ Kit(high) cells and two fetuses receiving CD34+ Kit- cells failed to show evidence of significant engraftment. Two fetuses were absorbed. A total of six fetuses receiving different cell populations were allowed to proceed to term, and the newborn sheep were serially examined for the presence of chimerism. Again, only the two sheep receiving CD34+ Kit(low) cells exhibited signs of engraftment upon serial examination. Earlier in studies of murine hematopoiesis, we have shown stage-specific changes in Kit expression by the progenitors. The studies of human cells reported here are in agreement with observations in mice, and indicate that human hematopoietic stem cells are enriched in the Kit(low) population.

Distribution of sister chromatid exchanges on the mouse chromosomes in vivo with reference to the replication properties of the X chromosome

1984 ◽  
Vol 26 (2) ◽  
pp. 152-157
Author(s):  
S. M. Singh ◽  
D. L. Reimer
Keyword(s):  
Bone Marrow ◽  
X Chromosome ◽  
Sister Chromatid ◽  
Bone Marrow Cells ◽  
Relative Length ◽  
Chromosome Length ◽  
Sister Chromatid Exchanges ◽  
Chromatid Exchanges ◽  
Marrow Cells

Frequency of sister chromatid exchanges (SCE) were recorded separately for different chromosomes from bone marrow cells of female mice of the two genetic strains (C3H/S and C57BL/6J). SCEs were evaluated following different doses of 5-bromo-2′deoxyuridine (BrdU) as nine hourly i.p. injections. The SCE per cell increased with increasing BrdU doses which was slightly higher in C3H/S than in the C57BL/6J. SCEs per cell were variable at every treatment – strain combination, possibly reflecting the heterogeneous nature of the bone marrow cells. In general, there is a positive correlation between SCE per chromosome and the relative chromosome length. Total SCEs on one of the large chromosomes (most likely the X chromosome), however, are significantly higher than expected on the basis of relative length alone. Most of this increase is attributable to one of the homologues of this chromosome, which is not in synchrony with the rest of the chromosomes and may represent the late-replicating X. These results when viewed in the light of replication properties of the heterochromatinized X, suggest a direct involvement of DNA replication in SCE formation and may argue against the replication point as the sole site for the SCEs.Key words: sister chromatid exchange, BrdU, recombination, replication, X chromosome.

scholarly journals AML cells are differentially sensitive to chemotherapy treatment in a human xenograft model

Blood ◽  
2013 ◽  
Vol 121 (12) ◽  
pp. e90-e97 ◽  
Author(s):  
Mark Wunderlich ◽  
Benjamin Mizukawa ◽  
Fu-Sheng Chou ◽  
Christina Sexton ◽  
Mahesh Shrestha ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Induction Therapy ◽  
Bone Marrow Cells ◽  
Xenograft Model ◽  
Chemotherapy Treatment ◽  
Key Points ◽  
Increased Sensitivity ◽  
Total Bone Marrow ◽  
Marrow Cells

Key Points A relevant xenograft chemotherapy model was developed by using standard AML induction therapy drugs and primary human AML patient samples. Human AML cells show significantly increased sensitivity to in vivo chemotherapy treatment compared with murine LSK and total bone marrow cells.

scholarly journals DISTINCT EVENTS IN THE IMMUNE RESPONSE ELICITED BY TRANSFERRED MARROW AND THYMUS CELLS

1969 ◽  
Vol 130 (6) ◽  
pp. 1243-1261 ◽  
Author(s):  
G. M. Shearer ◽  
G. Cudkowicz
Keyword(s):  
Bone Marrow ◽  
Immune Response ◽  
Bone Marrow Cells ◽  
Second Step ◽  
Cell Divisions ◽  
Cellular Events ◽  
Antigen Complex ◽  
Fresh Bone ◽  
Thymus Cells ◽  
Marrow Cells

Marrow cells and thymocytes of unprimed donor mice were transplanted separately into X-irradiated syngeneic hosts, with or without sheep erythrocytes (SRBC). Antigen-dependent changes in number or function of potentially immunocompetent cells were assessed by retransplantation of thymus-derived cells with fresh bone marrow cells and SRBC; of marrow-derived cells with fresh thymocytes and SRBC; and of thymus-derived with marrow-derived cells and SRBC. Plaque-forming cells (PFC) of the direct (IgM) and indirect (IgG) classes were enumerated in spleens of secondary host mice at the time of peak responses. By using this two-step design, it was shown (a) that thymus, but not bone marrow, contained antigen-reactive cells (ARC) capable of initiating the immune response to SRBC (first step), and (b) that the same antigen complex that activated thymic ARC was required for the subsequent interaction between thymus-derived and marrow cells and/or for PFC production (second step). Thymic ARC separated from marrow cells but exposed to SRBC proliferated and generated specific inducer cells. These were the cells that interacted with marrow precursors of PFC to form the elementary units for plaque responses to SRBC, i.e. the class- and specificity-restricted antigen-sensitive units. It was estimated that each ARC generated 80–800 inducer cells in 4 days by way of a minimum of 6–10 cell divisions. On the basis of the available evidence, a simple model was outlined for cellular events in the immune response to SRBC.

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