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Biomedical subjects

R M Pruss

Publications and source records attributed to R M Pruss.

41 records · Page 3Linked to original sources
PubMed1977

Variants of 3T3 cells lacking mitogenic response to epidermal growth factor.

We have previously demonstrated that epidermal growth factor (EGF) can serve as a potent mitogen for 3T3 cells. We have now selected variant 3T3 cell lines unable to respond to EGF, in order to define cellular events unique to the EGF response and to distinguish which of these events are necessary and which are merely correlative to mitogenesis. By simultaneously treating cells with EGF and colchicine, we eliminated those cells stimulated by EGF to enter mitosis. Of the eight clonal EGF nonresponder variants selected by this procedure, none retains a functional EGF receptor. The EGF nonresponsive va-riant lines still retain the ability to respond to other mitogens.

Cell Division↗
PubMed1975

Initiation of 3T3 fibroblast cell division by epidermal growth factor.

Epidermal Growth Factor (EGF) at concentrations of 10(-9) to 10(-10) M initiates cell division in both confluent and low density non-dividing 3T3 cells. Four days after addition of EGF to confluent or low density non-dividing 3T3 cells there is a 2- and 5-fold increase, respectively, in cell number.

Blood↗
PubMedDate not supplied

Enkephalin and neuropeptide Y: two colocalized neuropeptides are independently regulated in primary cultures of bovine chromaffin cells.

We have found that Neuropeptide Y is colocalized with enkephalin in bovine adrenal chromaffin cells. The two peptides can be found in the same granules in those cells where they coexist. These cells correspond to the adrenergic subpopulation of chromaffin cells since they contain the epinephrine synthetic enzyme, phenylethanolamine N-methyltransferase. Despite their coexistence, production of the two peptides is independently regulated. Enkephalin levels are doubled after nicotinic depolarization (which increases enkephalin synthesis) or after treatment with reserpine (which increases enkephalin precursor processing). Neither of these treatments, acting by different mechanisms, has any effect on the levels of Neuropeptide Y.

Adrenal Glands↗
PubMedDate not supplied

Neuropeptide Y and peptide YY neuronal and endocrine systems.

An extensive system of neuropeptide Y (NPY) containing neurons has recently been identified in the central and peripheral nervous system. In addition, NPY and a structurally related peptide, peptide YY (PYY), containing endocrine cells have been identified in the periphery. The NPY system is of particular interest as the peptide coexists with catecholamines in the central and sympathetic nervous system and adrenal medulla. Evidence has been presented which indicates that NPY may play important roles in regulating autonomic function.

Animals↗