title: Effects of age and nutrition on expression of CD25, CD44, and L-selectin (CD62L) on T-cells from neonatal calves.
abstract: Effects of the plane of nutrition and age on the proliferation and activation of lymphocyte subsets from milk replacer-fed calves were investigated in vitro. Holstein calves were fed a standard (0.45 kg/d of a 20% crude protein, 20% fat milk replacer, n = 4) or intensified (1.14 kg/d of a 28% crude protein, 20% fat milk replacer, n = 4) diet from 1 to 8 wk of age. Average daily weight gain of intensified-diet (0.66 kg/d) calves was greater than that of standard-diet (0.27 kg/d) calves. Relative to the pokeweed mitogen-induced responses of CD4(+) cells from steers (5 to 6 mo of age), CD4(+) cells from 1-wk-old calves showed decreased proliferative activity, delayed increase in CD25 expression, and no demonstrable increase in CD44 expression or decrease in CD62L expression. Calf CD8(+) and gammadeltaT-cell receptor(+) cells, unlike T-cells from the older animals, did not demonstrate decreased expression of CD62L after stimulation with mitogen. The increased expression of CD44 by mitogen-stimulated gammadeltaT-cell receptor(+) cells from older animals was not seen in gammadeltaT-cell receptor(+) cells from 1-wk-old calves. At wk 8 of age, mitogen-induced proliferation and expression of activation antigens by T-cells from standard-fed calves were similar to responses of T-cells from steers indicating rapid maturation of T-cell function during the neonatal period. Feeding calves an intensified milk replacer was associated with decreased proliferation of mitogen-stimulated CD4(+), CD8(+), and gammadeltaT-cell receptor(+) cells; decreased CD25 expression by mitogen-stimulated CD4(+) and CD8(+) cells; and decreased CD44 expression by mitogen-stimulated CD8(+) cells. These results indicate that the functional capacity of the calf's T-cell population becomes more adult-like during the first weeks of life and suggest that nutrition modulates T-cell function during this period of immune maturation.
authors: Nutritional Physiology Group, Department of Animal Science, Iowa State University, Ames 50011, USA.
authors: M R
authors: MR
authors: Foote
authors: B J
authors: BJ
authors: Nonnecke
authors: M A
authors: MA
authors: Fowler
authors: B L
authors: BL
authors: Miller
authors: D C
authors: DC
authors: Beitz
authors: W R
authors: WR
authors: Waters
mesh_terms: D000375:Aging; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D000831:Animals, Newborn / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D002417:Cattle / Q000235:genetics / Q000254:growth & development / Q000276:immunology*; D004032:Diet; D004044:Dietary Proteins / Q000008:administration & dosage; D005434:Flow Cytometry; D005456:Fluorescent Dyes; D018960:Hyaluronan Receptors / Q000032:analysis*; D019041:L-Selectin / Q000032:analysis*; D008213:Lymphocyte Activation; D008297:Male; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000032:analysis; D015375:Receptors, Interleukin-2 / Q000032:analysis*; D013601:T-Lymphocytes / Q000276:immunology*; D015430:Weight Gain
chemical_list: D004044:Dietary Proteins; D005456:Fluorescent Dyes; D018960:Hyaluronan Receptors; D016692:Receptors, Antigen, T-Cell, gamma-delta; D015375:Receptors, Interleukin-2; D019041:L-Selectin