Dr. Brandi  Walker   image

Dr. Brandi Walker

3805 White Plains Rd
Bronx NY 10467
718 980-0583
Medical School: Other - Unknown
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
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NPI: 1942599535
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Circulating fibroblast growth factor-like autoantibodies in two patients with multiple endocrine neoplasia type 1 and prolactinoma. - The Journal of clinical endocrinology and metabolism
Basic fibroblast growth factor (bFGF) is a potent endothelial cell mitogen found in a variety of normal and tumor tissues. bFGF lacks a classical amino-terminal signal sequence and is not readily detectable in plasma from normal subjects. In earlier studies we showed increased bFGF-like mitogenic activity for parathyroid-derived endothelial cells and (increased) bFGF immunoreactivity (0.24-1.28 ng/mL) in plasma of subjects with multiple endocrine neoplasia type 1 (MEN-1). In the present study we examined the proliferative activity of MEN-1 and normal plasmas (applied to protein-A columns) in calf pulmonary artery endothelial cells. Protein-A-eluted activity in plasma from MEN-1 prolactinoma plasma exceeded activity from normal and MEN-1 nonprolactinoma plasma in three of eight MEN-1 subjects with untreated or recurrent prolactinoma. Protein-A-eluted active fractions from MEN-1 prolactinoma plasma had several properties of an immunoglobulin G, including affinity for antihuman immunoglobulin G (IgG) agarose, sensitivity to thiols, and (prepared by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions) apparent mol wt corresponding to those of the heavy and light chains of IgG. The IgG fraction of MEN-1 prolactinoma plasma had far more activity in endothelial cells than did optimal concentrations of known growth factors or conditioned medium from prolactinoma cells. Endothelial cell bioactivity in protein-A-eluted fractions from MEN-1 prolactinoma plasma was neutralized 70% by rabbit antibodies to intact bFGF. These results imply novel growth stimulatory bFGF-like autoantibodies in a subset of MEN-1 patients with prolactinoma.

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3805 White Plains Rd Bronx, NY 10467
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