Differential effect of L3T4+ cells on recovery from total-body irradiation

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Experimental Hematology (Lawrence, Kansas); (USA)

OSTI ID:6789852

Pantel, K; Nakeff, A ^[1]

---

1. Wayne State Univ. School of Medicine, Detroit, MI (USA)

We have examined the importance of L3T4+ (murine equivalent to CD4+) cells for hematopoietic regulation in vivo in unperturbed mice and mice recovering from total-body irradiation (TBI) using a cytotoxic monoclonal antibody (MoAb) raised with the GK 1.5 hybridoma. Ablating L3T4+ cells in normal (unperturbed) B6D2F1 mice substantially decreased the S-phase fraction (determined by in vivo hydroxyurea suicide) of erythroid progenitor cells (erythroid colony-forming units, CFU-E) as compared to the pretreatment level (10% +/- 14.1% (day 3 following depletion) vs 79.8% +/- 15.9%, respectively) with a corresponding decrease in the marrow content of CFU-E at this time to approximately 1% of the pretreatment value. Although the S-phase fraction of CFU-GM was decreased to 2.2% +/- 3.1% 3 days after L3T4+ cell ablation from the 21.3% +/- 8.3% pretreatment value, CFU-GM cellularity showed little change over the 3 days following anti-L3T4 treatment. Anti-L3T4 MoAb treatment had little or no effect on either the S-phase fraction or the marrow content of hematopoietic stem cells (spleen colony-forming units, CFU-S) committed to myeloerythroid differentiation. Ablating L3T4+ cells prior to a single dose of 2 Gy TBI resulted in significantly reduced marrow contents of CFU-S on day 3 and granulocyte-macrophage colony-forming units (CFU-GM) on day 6 following TBI, with little or no effect on the corresponding recovery of CFU-E. The present findings provide the first in vivo evidence that L3T4+ cells are involved in: (1) maintaining the proliferative activity of CFU-E and CFU-GM in unperturbed mice and (2) supporting the restoration of CFU-S and CFU-GM following TBI-induced myelosuppression.

• OSTI ID: 6789852
• Journal Information: Experimental Hematology (Lawrence, Kansas); (USA), Journal Name: Experimental Hematology (Lawrence, Kansas); (USA) Vol. 18:8; ISSN EXHMA; ISSN 0301-472X
• Country of Publication: United States
• Language: English

Related Subjects

560152* -- Radiation Effects on Animals-- Animals
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL CELLS
ANIMALS
ANTIBODIES
BIOLOGICAL EFFECTS
BIOLOGICAL MATERIALS
BIOLOGICAL RADIATION EFFECTS
BLOOD
BLOOD CELLS
BODY
BODY FLUIDS
BONE MARROW CELLS
CELL DIFFERENTIATION
COLONY FORMATION
CONNECTIVE TISSUE CELLS
EXTERNAL IRRADIATION
IRRADIATION
LEUKOCYTES
LYMPHOCYTES
MACROPHAGES
MAMMALS
MATERIALS
MICE
MONOCLONAL ANTIBODIES
ORGANS
PHAGOCYTES
RADIATION EFFECTS
RODENTS
SOMATIC CELLS
SPLEEN
STEM CELLS
VERTEBRATES
WHOLE-BODY IRRADIATION