Search PubMed⌕ Search

Biomedical subjects

S Forsgren

Publications and source records attributed to S Forsgren.

95 records · Page 6Linked to original sources
PubMedDate not supplied

Anti-Ia.7 antibodies recognize a "major" idiotype of the anti-TNP antibody response in BALB/c mice.

Monoclonal antibodies to Ia.7 were used, in parallel with other antibodies specific for "major" and "private" idiotopes, to define idiotypic profiles in the primary anti-trinitrophenyl plaque forming cell (PFC) response of BALB/c and C57BL/6 mice. A considerable fraction (25%) of BALB/c but not C57BL/6 PFC were inhibited by anti-Ia.7 antibodies, which failed to inhibit PFC with other paratopic specificities. These results suggest idiotypic mimicry between "major" antibody clonotypes and MHC determinants which might play a role in the selection of antibody repertoires.

Animals↗
PubMedDate not supplied

The membrane receptor complex regulating induction and clonal expansion of normal murine B lymphocytes.

Induction of resting B lymphocytes results from the interaction of competent ligands or helper cells with "triggering receptors." Subsequent clonal expansion and performance are thought to be regulated by the interaction of selective growth or maturation factors with specific receptors on induced B cells. A set of membrane molecules of B lymphocytes, including IgM, IgD, IA, IE, lipopolysaccharide receptors, receptors for Fc and C3b, and other non-immunoglobulin structures recognized by some antiidiotypic antibodies, display ligand-induced relationships. Functional studies also indicate that this group of molecules functions as a complex that regulates delivery of inductive signals, the expression of growth and maturation receptors, and/or the outcome of the interactions of these receptors with the corresponding factors.

Animals↗
PubMedDate not supplied

Networks of peptide-containing nerve fibres in laryngeal nerve paraganglia. An immunohistochemical study.

Sections of rat superior and recurrent laryngeal nerves (SLN and RLN) with enclosed paraganglia and ganglionic cells were incubated with antisera against five different neuropeptides. Vasoactive intestinal polypeptide-like immunoreactivity (VIP-LI) and neuropeptide Y (NPY)-LI was detected in a large number of varicose nerve fibres in the paraganglia. A few varicosities of the paraganglia showed substance P (SP)-LI or calcitonin gene-related peptide (CGRP)-LI, whereas there were no signs of enkephalin (ENK)-LI in these varicosities. The paraganglionic cells never exhibited immunoreactivity for any of the peptides tested, whereas some of the associated ganglionic cells showed NPY-LI, VIP-LI or ENK-LI. The study shows that the paraganglia of the SLN and RLN receive a significant peptidergic innervation and suggests that the peptide-containing nerve fibres in these structures originate from cells other than the paraganglionic cells. The findings imply that in further studies defining the function of laryngeal nerve paraganglia in larynx physiology, the role of neuropeptides should be examined.

Animals↗
PubMedDate not supplied

Increased content of bombesin/GRP in human synovial fluid in early arthritis: different pattern compared with substance P.

OBJECTIVE: Bombesin (BN) and the mammalian homologue gastrin-releasing peptide (GRP) are known trophic factors, neurotransmitters and paracrine hormones. BN/GRP has not previously been demonstrated in synovial fluid. In this study, the amounts of BN/GRP and substance P (SP) present in synovial fluid from the knee joints of patients with rheumatoid arthritis (RA) and of healthy controls were measured. METHODS: Synovial fluid from the knee joint was collected from patients with either longstanding RA (n = 32) or early arthritis (symptoms for < 12 months; n = 9) and from control subjects, i.e., individuals without known joint disease (n = 10). These samples were analyzed using radioimmunoassays. RESULTS: Levels of BN/GRP-like peptide were below the assay detection limits in synovial fluid from controls. Detectable levels of immunoreactive BN/GRP were present in the majority of patients with either longstanding RA or early arthritis. The levels were significantly higher in the synovial fluid from patients classified as having early arthritis compared with those with longstanding RA (p < 0.05). There was a strong correlation between BN/GRP levels and the number of leukocytes in the synovial fluid in the patients with early arthritis. The levels of SP-like peptide in the patients, whether with early arthritis or longstanding RA, were significantly elevated compared with controls. However, there was no difference in the levels between these two patient groups. CONCLUSIONS: These observations show that BN/GRP-like peptide is present in the synovial fluid of joints affected by arthritis and that the pattern of BN/GRP increase differs from that of SP. It appears as if the presence of BN/GRP is particularly related to the early processes of joint involvement. These observations are of interest because BN/GRP has well-known trophic and paracrine effects and chondrocytes have recently been shown to produce neuropeptides such as BN/GRP.

Adult↗