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Biomedical subjects

C D Jordan

Publications and source records attributed to C D Jordan.

6 recordsLinked to original sources
PubMed1997

Taxol effect: bizarre mitotic figures (abnormal spindle asters) in a malignant peritoneal effusion: report of a case.

Taxol (Paclitaxol) is a diterpenoid taxane derivative found in the bark and needles of the Western yew, Taxus brevifolia, indigenous to the old growth forests of the Pacific Northwest. As compared with other antineoplastic agents (vinca alkaloids and colchicine) that enhance microtubule disassembly, taxol promotes microtubule polymerization. In interphase cells, abnormal microtubular bundles or arrays are seen. In mitotic cells, abnormal spindle asters form. Such morphologic changes have been described frequently in cell culture systems and in in vitro systems using fresh tumor tissue. To our knowledge, these changes have not been described in a peritoneal effusion specimen from a patient with stage III ovarian cancer treated with taxol. In addition, the mitotic stabilization produced interpretative difficulties in evaluating the peritoneal fluid because a vast majority of the presumed malignant cells were in mitosis and, hence, not evaluable by ordinary cytologic criteria.

Aged↗
PubMed1997

Fibrillin-1 in human cartilage: developmental expression and formation of special banded fibers.

The molecular basis for Marfan's syndrome (MS), a heritable disorder of connective tissue, is now known to reside in mutations in FBN1, the gene for fibrillin-1. Classic phenotypic manifestations of MS include several skeletal abnormalities associated primarily with overgrowth of long bones. As a first step towards understanding how mutations in FBN1 result in skeletal abnormalities, the developmental expression of fibrillin-1 (Fib-1) in human skeletal tissues is documented using immunohistochemistry and monoclonal antibodies demonstrated here to be specific for Fib-1. At around 10-11 weeks of fetal gestation, Fib-1 is limited in tissue distribution to the loose connective tissue surrounding skeletal muscle and tendon in developing limbs. By 16 weeks, Fib-1 is widely expressed in developing limbs and digits, especially in the perichondrium, but it is apparently absent within cartilage matrix. Fib-1 appears as a loose meshwork of fibers within cartilage matrix by 20 weeks of fetal gestation. Until early adolescence, Fib-1 forms loose bundles of microfibrils within cartilage. However, by late adolescence, broad banded fibers composed of Fib-1 are found accumulated pericellularly within cartilage. Because these fibers can be extracted from cartilage using dissociative conditions, we postulate that they are laterally packed and crosslinked microfibrils. On the basis of these findings, we suggest that the growth-regulating function of Fib-1 may reside persistently within the perichondrium. In addition, the accumulation of special laterally crosslinked Fib-1 microfibrils around chondrocytes during late adolescence suggests that growth-regulating activities may also be performed by Fib-1 at these sites.

Adolescent↗
PubMed1997

Necrobiosis lipoidica in a diabetic intravenous drug user.

Necrobiosis lipoidica occurs most commonly on the lower extremities in patients with diabetes; lesions typically occur in the pretibial region. Although the pathogenesis of necrobiosis lipoidica remains unclear, both external trauma and vascular damage have been proposed as contributing to the development of this disorder. We report polarizable foreign material in small blood vessels and multinucleated histiocytes in lesions of necrobiosis lipoidica. This phenomenon occurred in a patient who was both diabetic and an intravenous drug user.

Diabetes Complications↗
PubMed1996

Well-differentiated pulmonary neuroendocrine carcinoma metastatic to the endometrium: a case report.

The female genital tract is an infrequent site of metastasis, particularly for extragenital primaries. The ovary and vagina are the sites within the female genital tract that are the most frequently affected. The uterine corpus, especially the endometrium, is a distinctly unusual site of involvement. Primary lung cancer is the source of metastatic tumor to the female genital tract in less than 5% of patients. In the reported instances of endometrial involvement by a primary lung cancer, adenocarcinoma has been the reported subtype. Here, we report a case of well-differentiated neuroendocrine carcinoma of the lung metastatic to the endometrium in a 68-year-old woman with postmenopausal bleeding. Immunohistochemical studies were performed to confirm the neuroendocrine nature of the neoplasm.

Aged↗