Effect of cholinergic stimulation on free intracellular Ca2+ concentration in human lymphocytes.

Binding of ligand to receptor, in various types of cells, results in changes in calcium concentration, which is an important factor in cellular signal transduction. Lymphocytes receive signals from the parasympathetic nervous system through the cholinergic receptors. Cholinergic receptors mediate response to stimuli through changes of the IP3, or cAMP level and Ca2+ mobilization in various types of cells.

Accumulation of inositol 1,4,5-triphosphate after cholinergic stimulation of human lymphocytes.

The interrelationships between the immune and neurohormonal system are the subject of this work. The formation of inositol 1,4,5-triphosphate (IP3) in response to cholinergic stimulation was studied in the human peripheral blood mononuclear cells (PBMC) and lymphocytes from the lymphoblastoid cell lines Jurkat and Raji. The cells were stimulated with mitogen and then treated with cholinergic agonist-carbachol or nicotine.

Level of inositol-1,4,5-trisphosphate after cholinergic stimulation of human lymphocytes.

The interrelationships between the immune and neurohormonal system are the subject of this work. In this context, the formation of inositol-1,4,5-trisphosphate (IP3) in response to cholinergic stimulation was studied in activated human peripheral blood mononuclear cells (PBMC) and lymphocytes from the lymphoblastoid cell lines Jurkat and Raji. The cells were stimulated with mitogen and then treated with either the cholinergic agonist carbachol or nicotine.

Expression of muscarinic cholinergic receptors on lymphocytes in various subsets of rheumatoid arthritis and their variabilities connected with treatment.

Objective: To investigate muscarinic cholinergic receptors on lymphocytes from various subsets of patients with rheumatoid arthritis (RA).

Methods: The level of muscarinic receptors on peripheral blood lymphocytes from 38 patients with various subsets of RA [5 with inactive, 13 with active RA, 13 with rheumatoid vasculitis and 5 with reactive secondary amyloidosis (RSA)] was determined by the binding studies of specific muscarinic ligand [3H] quinuclidinyl benzilate in comparison to healthy individuals.

Results: Expression of muscarinic cholinergic receptors on lymphocytes in patients with RA was significantly higher (mean 1022; SD +/- 567) compared to healthy individuals (mean 647; SD +/- 170) (p < 0.

Muscarinic cholinergic receptors of rat lymphocytes: effect of antigen stimulation and local brain lesion.

Expression of muscarinic cholinergic receptors (m-AchR) on thymocytes and lymphocytes supports a hypothesis of direct interaction between autonomic innervation and the immune system. Using a muscarinic antagonist, [3H]quinuclidinyl benzilate ([3H]QNB), we revealed different characteristics of m-AchR expression in lymphocytes isolated from the spleen, peripheral blood or thymus of Wistar rats. To further explore the mechanisms controlling m-AchR expression in lymphocytes we have addressed two questions: (i) whether local brain lesions will affect [3H]QNB binding activity of lymphocytes and (ii) whether different antigens will alter m-AchR expression in lymphocytes.