新生儿病房铜绿假单胞菌的血清学分型,质粒分析研究

新生儿病房１９８９年１０月～１９９０年１２月、１９９６年３～６月两个时间段分离４０株铜绿假单胞菌，血清学分型率９７．５％，第一时间段以Ｏ１１型最多，占３０．４％，集中在１９９０年６～１０月，第二时间段Ｏ３型占９３．８％，集中在１９９６年３～６月，表明该病房发生两次铜绿假单胞菌医院感染流行。质粒检出率４２．９％，Ｏ１１型菌株质粒谱为８．１、４６．５、１７９．１ｋｂ，并经ＨｉｎｄⅢ酶切进一步证实为同一克隆。对氟哌酸、阿米卡星及头孢他啶的敏感率分别为１００％、９７．３％和９５％。对庆大霉素耐药率明显上升，提示控制铜绿假单胞菌医院感染的重要性。     

Graves病患者血清可溶性白介素2受体的探讨

对２８例Ｇｒａｖｅｓ病的可溶性白介素２受体（ｓＩＬ２Ｒ）和各种甲状腺激素以及甲状腺自身抗体治疗前后比较，并进行逐步回归，结果表明：治疗后Ｇｒａｖｅｓ病患者除ＴＳＨ外，各种甲状腺激素及甲状腺自身抗体显著降低（Ｐ＜００１），并对ｓＩＬ２Ｒ的上升与下降呈显著相关。     

Delivery of Antigens to the MHC Class I Pathway Using Bacterial Toxins

Cytotoxic T lymphocytes (CTL) recognize antigens derived from endogenously expressed proteins presented on the cell surface in the context of major histocompatibility complex (MHC) class I molecules. Because CTL are effective in antiviral and antitumor responses, the delivery of antigens to the class I pathway has been the focus of numerous efforts. Generating CTL by immunization with exogenous proteins is often ineffective because these antigens typically enter the MHC class II pathway. This review focuses on the usefulness of bacterial toxins for delivering antigens to the MHC class I pathway. Several toxins naturally translocate into the cytosol, where they mediate their cytopathic effects, and the mechanisms by which this occurs has been elucidated. Molecular characterization of these toxins identified the functional domains and enabled the generation of modified proteins that were no longer toxic but retained the ability to translocate into the cytosol. Thus, these modified toxins could be examined for their ability to carry peptides or whole proteins into the cytosolic processing pathway. Of the toxins studied—diphtheria, pertussis, Pseudomonas, and anthrax—the anthrax toxin appears the most promising in its ability to deliver large protein antigens and its efficiency of translocation.     

Down-regulation of rat β-adrenoceptors by clenbuterol or desipramine does not require chronic treatment: [H]CGP-12177 binding reveals rapid (24 hour) modulation

Desipramine (DMI, 15 mg/kg, s.c.) decreased [³H]CGP-12177-labelled cortical β-adrenoceptor density (B_max) by 30% upon chronic (14 day) treatment. However, even a single dose (in mg/kg) of DMI (15) or the β-adrenoceptor agonist, clenbuterol (20), induced a rapid (24 hour) and significant reduction of β-adrenoceptor B_max (−15%; p<0.01). Acute treatment with amitryptiline (10), clorgyline (1), fluoxetine (10), nomifensine (10) or maprotiline (20) had no significant effect on [³H]CGP-12177-labelled β-adrenoceptors, suggesting that rapid down-regulation may not be a general property of antidepressant drugs. None of the antidepressants altered the B_max of [³H]ketanserin-labelled 5-HT_2A receptors on acute treatment. These results show that β-adrenoceptor down-regulation by clenbuterol and DMI is not dependent on chronic treatment and may, therefore, be a poor correlate of the gradual onset of therapeutic efficacy seen clinically with antidepressant drugs.     

A Correlation Between the Permeability Characteristics of a Series of Peptides Using an in Vitro Cell Culture Model (Caco-2) and Those Using an in Situ Perfused Rat Ileum Model of the Intestinal Mucosa

In an attempt to establish an in vitro/in situ correlation of intestinal permeability data, the permeability coefficients (P _app) for a series of model peptides, which were determined using an in situ perfused rat ileum model, were compared to the permeability coefficients (P _mono) determined using an in vitro cell culture model (Caco-2). The model peptides, which were all blocked on the N-terminal (acetyl, Ac) and the C-terminal (amide, NH2) ends, consisted of D-phenylalanine (F) residues (e.g., AcFNH₂, AcFFNH₂, AcFFFNH₂). To alter the degree of hydrogen bonding potential, the nitrogens of the amide bonds were sequentially methylated [e.g., AcFF(Me)FNH₂, AcF(Me)F(Me)FNH₂, Ac(Me)F(Me)F(Me)FNH₂, Ac-(Me)F(Me)F(Me)FNH(Me)]. These peptides were shown not to be metabolized in the in situ perfused rat ileum system. The results of the transport experiments showed that there were poor correlations between the apparent permeability coefficients (P _app) determined in an in situ perfused rat ileum model and the octanol–water partition coefficients (r = 0.60) or the hydrogen bonding numbers (r = 0.63) of these peptides. However, good correlations were observed between the in situ P _app values for these peptides and their partition coefficients in heptane–ethylene glycol (r = 0.96) and the differences in their partition coefficients between octanol–water and isooctane–water (r = 0.86). These results suggest that lipophilicity may not be the major factor in determining the intestinal permeability of these peptides and that hydrogen bonding potential may be a major contributing factor. A good correlation (r = 0.94) was also observed between the P _app values determined for these peptides in the in situ perfused ileum model and those P _mono values determined in the in vitro cell culture model (Caco-2) (Conradi et al., Pharm. Res. 8:1453–1460, 1991). These results suggest that the permeability values determined in the Caco-2 cell culture model may be a good predictor of the intestinal permeability of peptides.     

氯菊酯和氯氰菊酯对大鼠脑突触体Ca~(2+)-和Ca~(2+),Mg~(2+)-ATP酶活性的抑制

氯菊酯可明显抑制Ca~(2+)—ATP酶活性,其抑制作用是可逆的,底物动力学分析表明为非竞争性抑制,介质的酸度可影响其抑制效应;氯氰菊酯对该酶活性无明显影响.氯菊酯和氯氰菊酯均能可逆性地抑制Ca~(2+),Mg~(2+)—ATP酶活性,但氯菊酯为反竞争性抑制.且有一定的pH依赖性,而氯氰菊酯为非竞争性抑制,其抑制率基本不受pH的影响,表明这两种杀虫剂在Ca~(2+) ,Mg~(2+)—ATP酶上有不同的结合位点.     

Are hypodense eosinophils in children activated or immature?

In patients with allergic asthma and rhinitis high numbers of hypodense eosinophils (HE) have been demonstrated. In a previous study we reported that asthmatic and healthy children had more HE than their adult counterparts. We assumed that this might, in part, he due to the presence of immature eosinophils in children. To distinguish between immature and activated eosinophils, determination of eosinophil cationic protein (ECP) might be interesting as it is known that high serum levels of ECP are associated with increased activation of eosinophiis. In this study we determined (he levels of ECP in scrum in asthmatic and healthy children and adults trying to distinguish activated from immature eosinophils. We found that ECP levels were not increased in children (healthy and asthmatic) compared to adults (healthy and asthmatic). This supports the hypothesis that increased numbers of HE in childhood are, at least in part, immature eosinophils. Nevertheless, we could confirm that inflammation was present in children because soluble interleukin-2-receptor (slL-2R), a marker of lymphocyte activation, was higher in asthmatic children as compared to healthy children. IL-6, a marker of macrophage/monocyte activation, was not different in the different patient groups. We conclude that although signs of inflammation are present in childhood asthma, the increased numbers of HE in children are in part due to the presence of immature eosinophils.     

Smooth muscle of rabbit isolated aorta contains the NK-2 tachykinin receptor

Summary Neurokinin A, neurokinin B and substance P caused concentration-related contractions of rabbit isolated aorta with pD₂ values of 8.1, 6.9 and 6.0, respectively. [D-Pro², D-Trp^7,9]-substance P, a competitive tachykinin antagonist, had pA₂ values of 5.3 against neurokinin A, 5.1 against neurokinin B and 5.2 against substance P indicating that tachykinin receptors mediated responses to the agonists. [pGIu⁵,MePhe⁸,-McGly⁹]-substance P 5–11 (DiMe-C7), senktide and septide did not contract the aorta. It is concluded that of the known tachykinin receptors smooth muscle of the rabbit isolated aorta contains only the NK-2 type. Send offprint requests to J. W. Constantine at the above address     

Three predominant proteins secreted by the human prostate gland

Analyses of the proteins of azoospermic ejaculates from subjects with defective seminal vesicles demonstrated that three prostatic-secreted proteins were predominant. Prostatic acid phosphatase (PAP), prostate-specific antigen (PSA; or gamma-seminoprotein), and beta-microseminoprotein (beta-MSP; or beta-inhibin), were identified as the three predominant proteins secreted by the normal human prostate gland. Immunohistochemical localization of these proteins, in the epithelium of normal prostatic acini and ducts, with the avidin-biotin complex procedure demonstrated that each PAP-immunoreactive cell was invariably immunoreactive both with PSA-and beta-MSP-monospecific antisera as well.