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Biomedical subjects

K Zupko

Publications and source records attributed to K Zupko.

16 recordsLinked to original sources
PubMed2000

An autonomy supportive model of geriatric team function.

Interdisciplinary teams play a critical role in the delivery of geriatric health care. Health care professionals are commonly left to develop teamwork skills by chance. Medical team function differs from traditional group theory in that all members are caregivers. A non-competitive supportive atmosphere is appropriate for patient care. We propose a participatory (autonomy supportive) model fostering self-realization and positive reinforcement as an organizing philosophy. The primary group task is to maximize patient functional independence and personal goals. Leadership is task-dependent.

Aged↗
PubMed1999

Six steps to improving office collections.

There are multiple reasons why accounts receivable are rapidly increasing. It's time to implement changes that will move those dollars into an interest-bearing account. These proven solutions can improve office collections.

Cost-Benefit Analysis↗
PubMed1991

Odorant signal termination by olfactory UDP glucuronosyl transferase.

The onset of olfactory transduction has been extensively studied, but considerably less is known about the molecular basis of olfactory signal termination. It has been suggested that the highly active cytochrome P450 monooxygenases of olfactory neuroepithelium are termination enzymes, a notion supported by the identification and molecular cloning of olfactory-specific cytochrome P450s (refs. 13-16). But as reactions catalysed by cytochrome P450 (refs 17, 18) often do not significantly alter volatility, lipophilicity or odour properties, cytochrome P450 may not be solely responsible for olfactory signal termination. In liver and other tissues, drug hydroxylation by cytochrome P450 is frequently followed by phase II biotransformation, for example by UDP glucuronosyl transferase (UGT), resulting in a major change of solubility and chemical properties. We report here the molecular cloning and expression of an olfactory-specific UGT. The olfactory enzyme, but not the one in liver microsomes, shows preference for odorants over standard UGT substrates. Furthermore, glucuronic acid conjugation abolishes the ability of odorants to stimulate olfactory adenylyl cyclase. This, together with the known broad spectrum of drug-detoxification enzymes, supports a role for olfactory UGT in terminating diverse odorant signals.

Amino Acid Sequence↗
PubMed1991

Immunolocalization of cytochromes P-450olf1 and P-450olf2 in rat olfactory mucosa.

Previously, we described two olfactory-specific cytochromes P-450: rat cytochrome P-450olf1 (IIG1), identified by cDNA cloning, and bovine cytochrome P-450olf2 (IIA), identified by peptide microsequencing of a transmembranal polypeptide (p52). Here we describe the preparation of polyclonal antisera against peptide sequences of these proteins and their use in the immunolocalization of cytochromes P-450olf1 and P-450olf2 in rat olfactory mucosa. Immunoreactivities related to both enzymes are found in the subepithelial Bowman's glands of olfactory mucosa. Practically no immunoreactivity was found in other rat tissues, including liver, lung, kidney and respiratory mucosa. In addition, double-labeling experiments demonstrated that cytochromes P-450olf1 and P-450olf2 are present in the same population of Bowman's glands. The olfactory-specific localization of cytochromes P-450olf1 and P-450olf2 is consistent with a role for these enzymes in the modification or clearance of odorants from the chemosensory tissue.

Animals↗
PubMed1990

Identification and biochemical analysis of novel olfactory-specific cytochrome P-450IIA and UDP-glucuronosyl transferase.

Two major transmembranal polypeptides of bovine olfactory epithelium were identified by SDS electrophoretic analysis of Triton X-114 solubilized membranes. Both polypeptides were present in large amounts in membranes of the olfactory epithelium but were barely detectable in membranes of the nasal respiratory epithelium. Both polypeptides are enriched in the deciliated epithelium as compared with isolated cilia. One of them is a glycoprotein with an apparent molecular mass of 56 kDa (gp56); the other is an unglycosylated protein with an apparent molecular mass of 52 kDa (p52). Sequence analysis of peptides obtained by CNBr cleavage of purified gp56 indicates that it is highly homologous to UDP-glucuronosyl transferase (UDPGT). Parallel analysis shows that p52 is highly homologous to cytochrome P-450 sequences of the IIA subfamily. This protein is assigned the name P-450olf2. Polyclonal antibodies were raised against synthetic peptides corresponding to gp56 and p52 peptide sequences. Immunoblots with these antibodies reveal the following properties of gp56 and p52: (1) they are enriched in the microsomal fraction of the bovine olfactory epithelium; (2) they are possibly specific to the olfactory epithelium, as we could not detect reactivity in microsomes derived from respiratory epithelium or lung, and only a very small amount of basal reactivity was seen with liver microsomes; (3) cross-reacting proteins exist in microsomes derived from the rat olfactory epithelium. These results are consistent with a mechanism whereby the microsomal enzymes are involved in odorant modification and clearance from the nasal tissue.

Amino Acid Sequence↗
PubMed1987

Antibody inhibition of suppressor cell induction.

The IJ genetic restrictions of suppressor T (Ts) cells are controlled by H-2-related determinants that are expressed on antigen-presenting cells. This has led to the hypothesis that Ts cells carry receptors for a self H-2-related ligand that is expressed on specialized antigen-presenting cells. We refer to this H-2-related ligand as the IJ interacting molecule. This report evaluates the ability of rabbit antibodies directed against idiotypes on monoclonal anti-IJ antibodies (the latter are presumably reactive with the Ts cell receptor) to bind IJ interacting molecule and to inhibit antigen presentation to Ts cells. Such anti-idiotypic reagents were prepared against T cell-reactive monoclonal anti-IJk and anti-IJd antibodies. The F(ab')2 fragments of these anti-idiotypic reagents blocked Ts cell induction. The inhibition was haplotype specific and mapped to the IJ region. The anti-idiotypic antibodies blocked the generation of Ts1, Ts2, and Ts3 cells. The cellular target of the blocking activity mediated by these anti-idiotypic antibodies is a macrophage. This was shown by using a cloned macrophage hybridoma line for both Ts induction and absorption of antibody activity. The combined data support the concept that macrophages express IJ interacting determinants that are responsible for Ts cell induction.

Animals↗
PubMed1986

Use of anti-idiotypic antibodies to explore genetic mechanisms of production of anti-DNA antibodies.

Systemic lupus erythematosus (SLE) is characterized by the production of autoantibodies with a broad range of antigenic specificities, including specificity for double-stranded DNA. Analysis of the idiotypic profile of anti-DNA antibodies both in humans and mice has demonstrated presence of cross-reactive idiotypes, suggesting that they arise from a restricted number of germline genes. Our laboratory has previously reported the generation of 3I, a monoclonal anti-idiotypic antibody which recognizes a cross-reactive idiotype on anti-DNA antibodies in a majority of unrelated humans with SLE. We have recently studied the expression of 3I in sera of three human kindreds with familial SLE. We found 6 of 8 SLE patients and 15 of 19 unaffected family members had elevated 3I reactivity. Eleven of these family members had no anti-DNA activity despite elevated 3I reactivity, suggesting that expression of this idiotype in certain individuals is part of the normal immune response. In another set of experiments using an in vitro culture system we examined somatic mutants of the S107 mouse myeloma cell line. This line makes an antibody which bears the T15 idiotype, a common idiotype on antibodies to the bacterial antigen phosphoryl choline (PC). U4, a mutant, makes an immunoglobulin which varies by one amino acid from the parent protein, retains the T15 idiotype, but loses reactivity with PC and acquires reactivity with DNA. We have found that some anti-DNA antibodies in mice with spontaneous lupus and in mice immunologically induced to make anti-DNA antibodies bear the T15 idiotype and may represent somatic mutants arising in vivo.

Animals↗
PubMed1985

Use of anti-idiotypic antibodies to identify a receptor for the T-cell I-J determinant.

In order to identify the molecule(s) interacting with the I-J determinant on suppressor T cells, we have generated two anti-idiotypic sera: one to monoclonal anti-I-Jd antibody and one to monoclonal anti-I-Jk antibody. These antisera specifically block suppressor T-cell function in a genetically restricted manner and have no effect on helper T-cell activation. Both recognize a marker on primary monocytes and B cells but not on T cells. A myeloma cell line bearing this marker has been identified. Therefore, these antisera may recognize a molecule on cells interacting with suppressor T cells that is involved in mediating suppressor T-cell activity. The relationship between the T-cell I-J determinant and the molecule identified by the anti-idiotype may be similar to the relationship between the receptor on helper T cells and Ia molecules.

Animals↗
PubMedDate not supplied

Why physicians are often disappointed with their practice administrators and managers.

This article provides a close look at why physicians often are disappointed with the practice administrator or manager they have hired or promoted. Reasons include: the wrong person was hired, such as one without the necessary qualifications and know-how, or the right person was hired, but wasn't given the authority to do the job. The article also provides practical tips on how to avoid mis-hires, how to evaluate the practice's managerial needs, and general differences between types of managers.

Administrative Personnel↗