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Biomedical subjects

E M Alderman

Publications and source records attributed to E M Alderman.

At least 19 recordsLinked to original sources
PubMed1999

Cervical Papanicolaou smear abnormalities in inner city Bronx adolescents: prevalence, progression, and immune modifiers.

BACKGROUND: The aim of this study was to quantify the prevalence of cervical smear abnormalities in sexually active adolescents and identify the effect of immune-modifying conditions. METHODS: Two hundred seventy-one females ages 13-22 years attending a clinic for sexually transmitted disease (STD) evaluation had cervical Papanicoloau (Pap) smears and completed sexual history questionnaires. Results of all follow-up Pap smears were obtained. Medical charts were available for 54 patients with cytologic follow-up and were reviewed for the presence of immune-modifying conditions. Follow-up smear results for patients with and without immune-modifying conditions were compared. Abnormality rates for all cervical smears seen in 1995 at Montefiore Medical Center were also obtained. RESULTS: The smear abnormality rate for adolescents was 20. 7% (abnormal squamous cells of undetermined significance [ASCUS], 12. 2%; low grade squamous intraepithelial lesion [LGSIL], 7.7%; high grade squamous intraepithelial lesion [HGSIL], 0.7%) compared with all adult females, for whom the rate was 13.2% (ASCUS, 9.9%; LGSIL, 2.5%; HGSIL, 0.6%; carcinoma 0.2%) (P < 0.0002). Of 20 initial ASCUS patients, 6 (30%) showed LGSIL or HGSIL on follow-up. Chart review allowed the clinical immune status of 54 patients to be determined. Of 14 patients with an immune-modifying condition (9 HIV positive patients, 3 receiving oral steroids, 1 liver transplant patient receiving steroids, and 1 with intestinal lymphangiectasia), 11 (78. 6%) developed or maintained an abnormality on cytologic follow-up. Of 40 patients with no identifiable immune-modifying condition, 11 (27.5%) developed or maintained an abnormality on cytologic follow-up (P < 0.00082). CONCLUSIONS: Sexually active adolescents are at higher risk of developing a significant cervical smear abnormality, especially LGSIL. Patients with an atypical Pap smear or immune-modifying condition require more attentive gynecologic monitoring. Cancer (Cancer Cytopathol)

Adolescent↗
PubMed1998

Are there risk factors for hepatitis B infection in inner-city adolescents that justify prevaccination screening?

PURPOSE: This study was undertaken to determine if homelessness could serve as a marker for previous hepatitis B infection (HBI), and thus justify prevaccination screening. METHODS: One hundred sexually active 13-21-year-olds (mean = 17 years), 74% female, attending an inner-city hospital-based adolescent clinic (HOSP), and 48 sexually active 13-21-year-olds (mean = 19 years), 40% female, attending a clinic based at an urban drop-in center (UDC) for street youth were consecutively enrolled, screened for HBI serum markers and administered a structured interview about sexual practices, sexual abuse, prior sexually transmitted diseases (STDs), and injection drug use. RESULTS: For the HOSP group, 7% were homeless and 4% were HBI positive. In the UDC group, 96% were homeless and 23% were HBI positive. Homelessness was significantly associated with HBI (p < 0.001), and this was corroborated by logistic regression analysis (p < 0.01). Other factors significantly associated with HBI in adolescents included a history of anal sex (p < or = 0.002), anal-receptive sex (p < or = 0.01), genital Chlamydia (p < or = 0.03), prostitution (p < or = 0.03), and sexual abuse (p < or = 0.002). For both populations, gender, sexual orientation, intravenous drug use, and genital sex were not related to HBI. CONCLUSION: These data indicate that homelessness and associated high-risk sexual practices may be indications for prevaccination screening for HBI in adolescents.

Adolescent↗
PubMed1997

Opiates.

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Adolescent↗
PubMed1995

Problem behaviors in inner-city adolescents with chronic illness.

This study examines the prevalence of problem behaviors (sexual activity, substance use, delinquency, and school failure) in a clinical hospital-based sample of 217 inner-city, 14 to 17 year olds with a variety of serious, chronic medical illnesses and compares this prevalence to that in a group of 121 similar-aged, healthy friends with no known chronic illnesses living in the same community. No differences were found between groups in substance use, delinquency, percent who had ever had sexual intercourse, or mean age at first intercourse. There was a significant interaction effect of chronic illness and gender on age at first intercourse (p = .015); boys without chronic illness initiated sexual intercourse at a younger age than their girlfriends without illness. Contrary to expectations, significantly more of the healthy friends had repeated a grade in school than had those with chronic illness (p = .002). Results are discussed in terms of the interrelationships of chronic illness, gender, and environment on problem behaviors.

Acting Out↗
PubMed1994

IL-1 and transforming growth factor-beta regulation of fibroblast-derived IL-11.

IL-11 and IL-6 are fibroblast-derived cytokines with overlapping biologic properties. To determine whether IL-11 and IL-6 are similarly regulated, we characterized the effects of rIL-1 and TGF-beta (beta 1 and beta 2) on human lung fibroblast IL-11 production and compared this regulation with that of IL-6. Unstimulated fibroblasts did not produce significant amounts of IL-11, whereas rIL-1 alpha and TGF-beta were dose-dependent stimulators of IL-11 protein production, mRNA accumulation, and gene transcription. rIL-1 alpha and TGF-beta also interacted in a synergistic fashion to further increase IL-11 protein production and mRNA accumulation. The effects of rIL-1 and TGF-beta individually were not altered by the cyclic nucleotide-dependent protein kinase inhibitor HA1004, protein kinase C (PKC) inhibition with staurosporine, or chronic phorbol ester preincubation, or the calmodulin antagonists W7 and TFP. The effects of rIL-1 alpha and TGF-beta in combination were also unaltered by HA1004, staurosporine, and chronic phorbol ester exposure. A23187, however, did induce IL-11 mRNA accumulation and W7 and TFP did reverse the synergistic stimulation caused by rIL-1 and TGF-beta in combination. In contrast with the regulation of IL-11, TGF-beta did not effectively stimulate IL-6 mRNA accumulation, rIL-1 alpha was a more potent stimulator of IL-6 than IL-11 production, and rIL-1-induced IL-6 mRNA accumulation was augmented by W7 and TFP. These studies demonstrate that: 1) rIL-1, TGF-beta, and agents that increase intracellular calcium stimulate lung fibroblast IL-11; 2) the IL-11 stimulatory effects of rIL-1 and TGF-beta are, at least partially, transcriptionally mediated and are the result of signal transduction pathways that are largely PKC, cyclic nucleotide, and calmodulin independent; and 3) rIL-1 and TGF-beta interact in a synergistic fashion to further increase fibroblast IL-11 production and that this synergy is mediated by a largely PKC- and cyclic nucleotide-independent and calmodulin-dependent activation pathway. Importantly, they also demonstrate that rIL-1 and TGF-beta stimulate lung fibroblast IL-6 and IL-11 production via distinct and differentially regulatable activation pathways.

Calcimycin↗
PubMed1994

Elevated endogenous serum macrophage colony-stimulating factor in the early stage of fungemia following bone marrow transplantation.

Murine studies have reported elevated serum macrophage colony-stimulating factor (M-CSF) concentrations in animals inoculated with fungus; however, the human cytokine response to fungemia has not been described. Endogenous M-CSF serum concentrations were measured in 18 autologous bone marrow transplant patients with positive blood fungal cultures. Seventeen of the 18 patients received the same high-dose chemotherapy regimen with autologous hematopoietic support. M-CSF concentrations were determined in serum samples obtained 1 week before and within 2 days of the first positive blood culture. Serum M-CSF rose more than three-fold in a majority of patients at the time of positive culture in contrast to concentrations obtained in the previous week (medians 11.1 and 2.8 ng/mL, respectively; p = 0.001). Median values at the time of positive blood culture were also significantly higher than those obtained in a matched control group of patients without positive blood cultures (n = 18; median 2.60 ng/mL; p = 0.001). These data demonstrate that endogenous serum M-CSF is elevated in the early stages of human systemic fungal infection and thus may have important diagnostic and therapeutic implications.

Adult↗
PubMed1993

Biochemical, immunological, and in vivo functional characterization of B-domain-deleted factor VIII.

Coagulation factor VIII (FVIII) is a cofactor in the intrinsic pathway of blood coagulation for which deficiency results in the bleeding disorder hemophilia A. FVIII contains a domain structure of A1-A2-B-A3-C1-C2 of which the B domain is dispensable for procoagulant activity in vitro. In this report, we compare the properties of B-domain-deleted FVIII (residues 760 through 1639, designated LA-VIII) to wildtype recombinant FVIII. In transfected Chinese hamster ovary (CHO) cells, LA-VIII was expressed at a 10- to 20-fold greater level compared with wildtype FVIII. The specific activity of purified LA-VIII was indistinguishable from wild-type recombinant FVIII and both exhibited similar thrombin activation coefficients. Wildtype recombinant-derived FVIII and LA-VIII also displayed similar timecourses of thrombin activation and heavy chain cleavage. However, compared with wildtype recombinant-derived FVIII, the light chain of LA-VIII was cleaved fivefold more rapidly by thrombin. Addition of purified von Willebrand factor (vWF) did not alter the kinetics of thrombin cleavage or activation of either wildtype recombinant-derived FVIII or LA-VIII. The immunogenicity of LA-VIII was compared with wildtype FVIII in a novel model of neonatal tolerance induction in mice. The results did not detect any immunologic differences between wildtype FVIII and LA-VIII, suggesting that LA-VIII does not contain significant new epitopes that are absent in wildtype FVIII. LA-VIII was tolerated well on infusion into FVIII-deficient dogs and was able to correct the cuticle bleeding time similar to wildtype recombinant factor VIII. In vivo, LA-VIII was bound to canine vWF and exhibited a half-life similar to wildtype recombinant FVIII. These studies support that B-domain-deleted FVIII may be efficacious in treatment of hemophilia A in humans.

Animals↗
PubMed1992

Structure-function relationships of interleukin-3. An analysis based on the function and binding characteristics of a series of interspecies chimera of gibbon and murine interleukin-3.

IL-3 is a glycoprotein cytokine involved in the hematopoietic response to infectious, immunologic, and inflammatory stimuli. In addition, clinical administration of recombinant IL-3 augments recovery in states of natural and treatment-related marrow failure. IL-3 acts by binding to high affinity cell surface receptors present on hematopoietic cells. To determine the site(s) at which IL-3 binds to it receptor, we analyzed a series of interspecies chimera of the growth factor for species-specific receptor binding and biological activity. The results suggest that IL-3 binds to its receptor and triggers a proliferative stimulus through two noncontiguous helical domains located near the amino terminus and the carboxy terminus of the molecule. To corroborate these findings, we have also mapped the binding epitopes of 10 mAb of human or murine IL-3, and have defined four distinct epitopes. Two of these epitopes comprise the amino-terminal receptor binding domain. A third epitope corresponds to the carboxy-terminal receptor interactive domain, and the fourth epitope, apparently not involved in the interaction of IL-3 and its receptor, lies between these sites. And on the basis of sandwich immunoassays using pairs of these mAbs, the two receptor interactive regions appear to reside in close juxtaposition in the tertiary structure of the molecule. These results provide a correlation of the structure-function relationships of IL-3 that should prove useful in evaluating the details of IL-3-IL-3 receptor interaction and in the rational design of clinically useful derivatives of this growth factor.

Adult↗
PubMed1992

The pediatrician's role in the diagnosis and treatment of substance abuse.

Abuse of drugs and alcohol is pervasive in our society. The role of the pediatrician as a health-care provider from birth through young adulthood includes recognizing the stigmata in newborns of prenatally ingested drugs as well as being able to treat neonatal drug withdrawal syndromes. Questioning about drug use and other closely related topics should be incorporated into all health-care maintenance visits, starting at the age of 10 y, with parental participation and anticipatory guidance being offered. Physical examination and laboratory testing are not as helpful in confirming an impression of substance abuse as a comprehensive interview and a full appreciation of the warning signs of substance abuse. Treatment of the problematic user with a multidisciplinary team that understands adolescent development and behavior as well as the problem of substance abuse is crucial. The decision to treat the teen in an ambulatory or inpatient setting is determined by the extent of abuse, underlying medical problems and psychopathology, and the degree of family dysfunction. The pediatrician must not avoid addressing these issues with patients. If, however, upon identifying an adolescent or a newborn with a drug problem, the pediatrician feels uncomfortable or ill-prepared to manage the patient, appropriate professional referrals are warranted. Despite exercising the referral option for treatment, as advocate for child and family, the pediatrician remains professionally bound to track all drug abuse-related referrals while continuing to participate in the general ongoing care of the patient and family. Finally, the pediatrician should retain a public advocacy role in the community by offering educational, preventive, and supportive efforts in the continuing struggle against drug abuse.

Adolescent↗
PubMed1991

An internal ribosome binding site can be used to select for homologous recombinants at an immunoglobulin heavy-chain locus.

The encephalomyocarditis virus (EMCV) leader sequence is responsible for efficient, cap-independent translation initiation from the viral RNA. It has been used to increase the expression of internal coding regions on polycistronic mRNA encoded by recombinant DNA constructs. We have designed a sequence-replacement-type vector for targeting to immunoglobulin heavy-chain loci in hybridoma cells. Homologous recombination of this vector introduces a human gamma 1 constant-region sequence linked to the EMCV leader and a neomycin phosphotransferase (neo) gene. The resulting cells express a bicistronic mRNA encoding at the 5' end a chimeric murine VDJH-human C gamma 1 heavy chain, followed by neo linked to the internal ribosome binding site provided by the EMCV leader. These homologous recombinants express the chimeric heavy chain at levels equivalent to the heavy chain in the parental hybridoma. This strategy of using an EMCV-neo cassette to obtain efficient selectable marker gene expression has potential application to a range of gene targeting vectors.

Animals↗
PubMed1990

High level synthesis of immunoglobulins in Chinese hamster ovary cells.

The expression of lambda L and microH chain cDNA was examined in Chinese hamster ovary cells. Each cDNA was linked to a different, amplifiable, selectable drug marker gene, and expression was monitored in the presence of increasing concentrations of the selective drugs. Cells were obtained that produced greater than 60 micrograms/10(6) cells/48 h of assembled antibody. This Chinese hamster ovary cell-synthesized IgM was polymeric, and exhibited specific hapten binding and C fixation. The expression strategy employed here may prove useful for the future production of genetically engineered antibodies and other multi-subunit proteins.

Animals↗
PubMed1990

Inhibition of receptor binding and neutralization of bioactivity by anti-erythropoietin monoclonal antibodies.

We have generated four high affinity monoclonal antibodies (MoAbs) to recombinant human erythropoietin (EPO). All four MoAbs immunoprecipitate radioiodinated native EPO, and the concentrations of MoAbs required for maximum binding range from 10 nmol/L to 100 nmol/L. Two MoAbs, designated Group I MoAbs, bind to an epitope within the N-terminal 20 amino acids of EPO and also immunoprecipitate sodium dodecyl sulfate (SDS)-denatured EPO. Two other MoAbs (Group II MoAbs) do not immunoprecipitate SDS-denatured EPO and do not bind to any of the eight endo C fragments of EPO. We first used murine erythroleukemia (MEL) cells to test the MoAbs for inhibition of EPO-receptor binding. MEL cells, although unresponsive to EPO, express 760 high affinity receptors for EPO per cell (Kd = 0.24 nmol/L). To assay our MoAbs, MEL cells were grown as monolayers on fibronectin-coated Petri dishes and incubated at 4 degrees C with radioiodinated EPO. Group I MoAbs do not inhibit binding of radioiodinated EPO to the MEL EPO-receptor, but Group II MoAbs do inhibit binding in a dose-dependent manner. We next examined the neutralization of EPO bioactivity by our MoAbs, using EPO-dependent cell line. Only Group II MoAbs inhibit a newly developed EPO-dependent cell growth, demonstrating that inhibition of EPO-receptor binding correlates with neutralization of EPO bioactivity.

Animals↗
PubMed1986

Immunocytochemical and enzymatic detection of lysozyme in human colon carcinoma cell lines.

Six of a total of 14 human colon carcinoma cell lines produce and secrete lysozyme in vitro. Three also produce the enzyme when propagated in vivo in athymic mice. None of the lysozyme positive cells stained in a manner typical of Paneth cells. Additionally, lysozymes from all six colon lines possess identical molecular weights (approximately 14,000 daltons).

Animals↗
PubMed1985

Angiogenic activity of human tumor plasma membrane components.

Plasma membranes from the human colon adenocarcinoma cell line HT-29 have been isolated and examined for the presence of angiogenic activity. Membrane-associated macromolecules extracted with Triton X-100 were fractionated on immobilized wheat germ agglutinin. The fraction which bound specifically (about 200 ng of protein/mL packed cells) was highly angiogenic when assayed on the chick embryo chorioallantoic membrane. As little as 0.2 ng of this human tumor derived material consistently induced neovascularization. Similarly, 1-2 ng of this material implanted into the rabbit cornea induced new vessel growth (5-8 mm) within 10 days. The plasma membranes of eight other human tumor lines were examined for angiogenic activity. For each, the wheat germ agglutinin bound material induced neovascularization at the low nanogram level. In contrast, the wheat germ agglutinin bound material derived from purified plasma membranes of two normal human diploid fibroblast cell lines failed to induce an angiogenic response on the chick chorioallantoic membrane, even at microgram levels.

Animals↗
PubMed1985

Partial purification and characterization of a vascular permeability factor secreted by a human colon adenocarcinoma cell line.

The established human colon adenocarcinoma cell line, HT-29, secretes a vascular permeability factor (VPF) in vitro. The factor has been purified from serum-free conditioned medium by acidification, cation-exchange, and reverse-phase and anion-exchange high-performance liquid chromatography. The VPF is a non-glycosylated acidic protein of apparent molecular weight 45,000, and is at least 4 orders of magnitude more potent than histamine as an inducer of vascular permeability. Its biological activity is unaffected by soybean trypsin inhibitor or by inhibitors of histamine, kinins, prostaglandins, or acid proteases. The VPF induces vascular permeability within minutes, which suggests a direct effect on the endothelial cell.

Adenocarcinoma↗
PubMed1985

Isolation and characterization of angiogenin, an angiogenic protein from human carcinoma cells.

The first human tumor derived protein with in vivo angiogenic activity to be obtained in pure form has been isolated from serum-free supernatants of an established human adenocarcinoma cell line (HT-29) and named angiogenin. It was purified by cation-exchange and reversed-phase high-performance liquid chromatography; the yield was approximately 0.5 microgram/L of medium. Biological activity of angiogenin was monitored throughout purification by using the chick embryo chorioallantoic membrane assay. Statistical evaluation demonstrates that it displays activity in this system with as little as 35 fmol per egg. Moreover, only 3.5 pmol is required to induce extensive blood vessel growth in the rabbit cornea. The amino acid composition of this basic (isoelectric point greater than 9.5), single-chain protein of molecular weight approximately 14 400 has been determined. The amino terminus is blocked, and the carboxyl-terminal residue is proline.

Adenocarcinoma↗