Abstract:Peripheral blood leukocytes (PBL) from primed rabbits were able to suppress the in vitro anti-sheep red blood cell (SRBC) plaque-forming cell (PFC) response of autologous spleen cells. A population containing the suppressor cells could be isolated from PBL by cell fractionation on columns of insolubilized histamine. In contrast to spleen cells, PBL generatd a weak secondary anti-SRBC response in vitro. A strong response was obtained with PBL freed from histamine-binding (H+) cells. The addition of these H+ cel… Show more
“…The presence of histamine receptors on mononuclear cells in peripheral blood, and the suppressive role of these cells in inflammation, were confirmed in animal models. Further studies showed that histamine-binding peripheral blood T lymphocytes are responsible for inhibition of inflammation [5]. In 1992, Shibata et al .…”
Section: Histamine As Immunomodulator Of Lymphocyte Activitymentioning
Histamine is one of the most important biogenic amines in medicine and biology but its role in allergy, autoimmune and neoplastic diseases has not yet been fully defined. The last few years have brought many discoveries concerning important modulatory effects of histamine and its receptors on basic mechanisms of the immunological processes. The role of histamine H1 and H2 receptors in immunomodulation has been established. The immunomodulatory function of a newly described histamine H4 receptor has been revealed. One of the most important modulatory effects of histamine currently studied is its influence on T lymphocyte differentiation and function. Our present knowledge suggests that histamine may have a wider influence on various immunological processes than is now accepted; therefore, we need further studies to fully clarify the role of histamine and its receptors. This knowledge can bring new therapeutic solutions in allergies, autoimmune diseases and malignancies.
“…The presence of histamine receptors on mononuclear cells in peripheral blood, and the suppressive role of these cells in inflammation, were confirmed in animal models. Further studies showed that histamine-binding peripheral blood T lymphocytes are responsible for inhibition of inflammation [5]. In 1992, Shibata et al .…”
Section: Histamine As Immunomodulator Of Lymphocyte Activitymentioning
Histamine is one of the most important biogenic amines in medicine and biology but its role in allergy, autoimmune and neoplastic diseases has not yet been fully defined. The last few years have brought many discoveries concerning important modulatory effects of histamine and its receptors on basic mechanisms of the immunological processes. The role of histamine H1 and H2 receptors in immunomodulation has been established. The immunomodulatory function of a newly described histamine H4 receptor has been revealed. One of the most important modulatory effects of histamine currently studied is its influence on T lymphocyte differentiation and function. Our present knowledge suggests that histamine may have a wider influence on various immunological processes than is now accepted; therefore, we need further studies to fully clarify the role of histamine and its receptors. This knowledge can bring new therapeutic solutions in allergies, autoimmune diseases and malignancies.
“…As reported previously, a good secondary antibody response can be obtained with such PBL on condition that histamine-binding suppressor T cells are removed [Z]. The cell fractionation procedure on insolubilized histamine and the culture conditions for PBL have been described [25]. The numbers of direct and indirect plaques were determined following the Cunningham method.…”
Section: Induction Of An In Vitro Plaque-forming Cell (Pfc) Responsementioning
A range of purified rabbit anti-Micrococcus luteus antibodies (anti-MCAb) were tested for their ability to interfere with a variety of in vitro immune responses. Such antibodies strongly inhibited the secondary IgG antibody response to sheep red blood cells without affecting the IgM response or the proliferative responses to mitogens and antigens. By exposing lymphocyte populations to anti-MCAb, it was found that such reagents exerted a strong mitogenic effect on rabbit T lymphocytes, provided these cells were derived from antigen-activated lymph nodes. This mitogenic effect was also obtained with F(ab')2 fragments of anti-MCAb and with hybridoma-derived anti-MCAb. Collectively, these data indicate that anti-MCAb inhibit the initiation of IgG synthesis possibly through the expansion of immunoregulatory T cell subsets.
“…Although the mechanisms responsible for autoimmunity are still poorly defined, both functional and numerical defects in the cells actively suppressing autoaggressive lymphocytes are likely candidates (6)(7)(8). A subset of T cells with the potential to suppress B cells, has been recognized by its ability specifically to bind histamine to membrane receptors (H + T cells) (9)(10)(11)(12)(13)(14)(15)(16).…”
Section: Accepted For Publication 21 January I984mentioning
A fluorescence assay was employed to measure the levels of circulating suppressor/cytotoxic T cells with membrane receptors for histamine (H +T cells) in 33 patients with chronic active hepatitis, in seven patients with metabolic and vascular liver disorders and in 25 healthy individuals. The H + T cells were decreased in patients with CAH (4.6k2.2 cells/mm3 vs 16k3.9 cells/mm3; p
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