Involvement of mu opioid receptors of periaqueductal gary (PAG) in acupuncture inhibition of noxious blood pressure response in rabbits

Strong electric shock stimulation of the rabbit front paw elicited a pressor blood pressure response regarded as noxious response. Ligands of mu opioid receptors were microinjected into the PAG to observe their effects on acupunture inhibition of the pressor response. (1) Ohmefentanyl (OMF), a mu agonist, significantly attenuated the pressor response. Mu antagonist TCTAP greatly enhanced the pressor response. (2) Electroacupuncture (EA) significantly inhibited the pressor response, the inhibition being readily reversed by TCTAP. The response after TCTAP was significantly greater than that of the control before EA. The results suggest that noxious stimulation is able to activate the mu opioid receptor of the PAG to modulate the noxious response and EA is able to enhance the activation.

Beneficial effect of an ACTH-(4-9) analog (Org2766) in the treatment of experimental cortex lesion in rats

This paper reports that lesions of the medial frontal cortex (MFC) caused behavioral deficit in rats and that this deficit could be attenuated by a well formulated treatment with Org2766, an analog of ACTH-(4-9). Wistar rats were distributed in 3 groups: MFC lesion treated with saline (M-N); MFC lesion treated with Org2766 (M-O); and sham-operation treated with saline (S). Repeated Org2766 or saline injection commenced from the day of surgery and lasted for 13 days. After surgery, the rats were trained in a passive avoidance task and then in an active avoidance task. MFC lesions were found to be strongly associated with behavioral deficits. The M-N group rats displayed poor retention of the passive avoidance response and showed much slower learning of the active avoidance task as compared to S group rats. The result showed that chronic Org2766 administration improved the behavioral performance of both tasks in MFC lesioned rats. The also revealed that the superoxide dismutase (SOD) activity was significantly increased in the M-O group as compared to the M-N group 15 days after surgery. The possible mechanisms related to the beneficial effect of Org2766 on cortex damage are discussed.

Body mass, fat distribution and cardiovascular risk factors in a lean population of south China

The associations of body mass index and abdominal adiposity, represented by an elevated waist/hip circumference ratio, with cardiovascular risk factors were examined in men and women, aged 28-69 years, from urban and rural areas of Guangzhou, China. Mean body mass index ranged from 20.1 to 21.9 kg/m2 across the four sex- and area-groups. Mean waist/hip ratio was 0.84 in men and 0.80 in women. After accounting for age and body mass index, waist/hip ratio was associated negatively (p < 0.05) with fasting serum HDL cholesterol (both sexes), and positively with serum triglycerides (both sexes), total and LDL cholesterol (men only), uric acid (both sexes), glucose (women only), and mean systolic blood pressure (women only). Body mass index was associated in a similar direction with most of these risk factors. These data confirm that abdominal adiposity is independently associated with cardiovascular disease risk factors, even in a lean Asian population.

Release of gonadotropin-releasing hormone (GnRH) from the medio-basal hypothalamus induced by electroacupuncture in conscious female rabbits

In electroacupuncture (EA) treatment, successful induction of ovulation is usually accompanied with the facilitation of pulsatile secretion of gonadotropin. The present work studied the release of GnRH from the mediobasal hypothalamus (MBH) using push-pull perfusion technique in conscious New Zealand female rabbits before, during and after EA stimulation. EA (4Hz, 5mA, 30 min) of Guanyuan (Ren 4), Zhongji (Ren 3), bilateral Sanyinjiao (SP 6) and Zigong (Extra 16) was given at the end of the 1st, 3rd and 5th hour during 6 hours' perfusion (EA group, n = 6). Cupric acetate (CuAC) was given (1%, 0.9 ml, i.v.) at the end of the 1st hour perfusion (CuAC group, n = 5) as a control since it is known as a stimulant for the release of GnRH. Rabbits in the control group (n = 4) were under the same perfusion condition except with no CuAC injection or EA stimulation. It was found that GnRH level was elevated immediately and significantly (4.64 +/- 0.98 v.s. 2.08 +/- 0.01 pg/ml, P < 0.05) after EA stimulation. In the CuAC group, GnRH level was also significantly elevated (3.84 +/- 0.37 v.s. 2.08 +/- 0.001 pg/ml, P < 0.05) one hour after CuAC injection. In addition, corpus lutein were observed both in the EA group (2/6) and the CuAC group (5/5). No similar changes were found in the control group. The data suggest that EA is capable of facilitating GnRH release from the MBH.

Mu opiate receptor antagonist blocks electroacupuncture inhibition on noxious blood pressure response in rabbits

A pressor blood pressure response was elicited by strong electric shock stimulation of the front paw in rabbits anesthetized with chloralose and urethane, immobilized by gallamine triethiodide and maintained by artificial ventilation. The pressor response showed a gradual decline in 3-4 successive trials. Naloxone or TCTAP, a specific mu receptor antagonist, administered intraventricularly (icv) at that time could facilitate the pressor response (n = 8, P < 0.02; n = 7, P < 0.01), suggesting the involvement of mu receptors in the declination of the pressor response. Electroacupuncture could inhibit the pressor response (n = 7, P < 0.01), and the inhibition was readily blocked by TCTAP (n = 7, P < 0.01). No obvious changes were observed in the normal saline control group. The results suggest that acupuncture is able to inhibit the pressor response via the activation of the opioid peptidergic system, of which the mu receptor is an important component.

High-performance liquid chromatographic separation of ondansetron enantiomers in serum using a cellulose-derivatized stationary phase and solid-phase extraction

R(-)-Ondansetron and S(+)-ondansetron in human serum were resolved and quantified using a stereospecific HPLC method. Each enantiomer and the internal standard prazosin were isolated from serum using a solid-phase extraction procedure on a cyanopropyl column. Recoveries of 97, 96 and 88% were obtained for the R(-)-enantiomer, the S(+)-enantiomer, and the internal standard, respectively. A cellulose-based chiral analytical column (Chiralcel OD) was used with a mobile phase consisting of hexane-95% ethanol-2-propanol-acetonitrile (65:25:10:1, v/v). Linear calibration curves were obtained for each enantiomer in serum in the concentration range 10-200 ng/ml. The limit of quantitation of each enantiomer was 10 ng/ml. The detection limit for each enantiomer in serum using UV detection at 216 nm was 2.5 ng/ml (signal-to-noise ratio of 3).

Transformation-sensitive cells in G2/M-phase are not promoted by TPA following 137Cs gamma-rays

Mouse C3H 10T1/2 cells are most sensitive to radiation-induced neoplastic transformation in the G2/M-phase of the cell cycle. When synchronized 10T1/2 cells were exposed to phorbol 12-myristate 13-acetate (TPA) after irradiation, transformation of cells not in the transformation-sensitive window was enhanced, but transformation of cells already in the transformation-sensitive window was not. Earlier work showed that (a) TPA enhances the frequency of transformation of both high and low dose-rate gamma-irradiated cells by about the same factor, but that (b) TPA enhances the transformation of cells exposed to low dose-rate fission spectrum neutrons appreciably less than cells exposed to high dose-rate fission spectrum neutrons. The latter observation is consistent with the inability of TPA to promote cells in the transformation-sensitive window and with the role of such cells in enhancing transformation by protracted doses of neutrons. The data provide a cellular basis for studying the biochemical/molecular aspects of TPA promotion in vitro.

Liquid chromatographic separation of praziquantel enantiomers in serum using a cellulose-based chiral stationary phase

R(-) and S(+) praziquantel (PZQ) in human serum were resolved and quantified using a stereospecific LC method. Each enantiomer and the internal standard 2-methylamino-5-chlorobenzophenone were isolated from serum using a solid-phase extraction procedure on a cyanopropyl column. Recoveries of 98.8, 93.3 and 35.4% were obtained for R(-) PZQ, S(+) PZQ, and the internal standard, respectively. A cellulose-based chiral analytical column (Chiralcel OD) was used with a mobile phase consisting of hexane-2-propanol (70:30, v/v). Linear calibration curves were obtained in the concentration range 50-1000 ng ml-1 for each enantiomer in serum. The detection limit for each enantiomer in serum using UV detection at 212 nm was 5 ng ml-1 (S/N = 3). The limit of quantitation of each enantiomer was 25 ng ml-1.

Lignification in cell suspension cultures of Pinus taeda. In situ characterization of a gymnosperm lignin

Pinus taeda suspension cultures grown in medium containing 2,4-dichlorophenoxyacetic acid showed only primary cell wall formation and essentially no lignification, as determined by histochemical, ultrastructural, chemical, and NMR spectroscopic analyses. However, these cultures maintained a functional phenylpropanoid pathway as demonstrated by formation of the lignans (-)-matairesinol and (-)-pinoresinol. Administration of [1-13C]Phe to these cultures, followed by solid-state carbon-13 NMR spectral analysis of their cell walls, demonstrated that the phenylalanine incorporated into the cell wall matrix was primarily as protein, rather than lignin. Successive transfer of the 2,4-dichlorophenoxyacetic acid-grown cultures to alpha-naphthaleneacetic acid-containing medium induced cell wall thickening concomitant with lignification. The presence of lignin was confirmed by histochemical, ultrastructural, chemical, biochemical, and NMR spectroscopic analyses. Specific labeling of the lignin polymer in situ with [1-13C]-, [2-13C]-, and [3-13C]Phe and analysis of the cell wall preparations by solid-state carbon-13 NMR spectroscopy permitted the first direct determination of the in situ bonding patterns in a gymnosperm lignin. Several dominant interunit linkages were observed, including beta-O-aryl, furanofuran, phenylcoumarin, and phenolic-linked monolignols, consistent with those predicted but hitherto not proven. Finally, milled wood lignin derivatives prepared from these 13C-specifically enriched lignin tissues gave a relatively high fidelity copy of the native lignin.

[An experimental study on accelerating regeneration of meniscus with synovial flap implant in the rabbit knee]

Twenty-three rabbits were used in this study. In each animal the right knee was used for experimental group in which the synovial flap was implanted in after meniscectomy and the left knee for control group, in which only meniscectomy was done. Samples were collected 3, 6, 12, and 24 weeks after operation. The regenerated meniscus in two groups were evaluated grossly. Histologically by light microscopy, and subcellularly by transmission electron microscopy. It was showed that the regenerated meniscus of the experimental group were better than those of the control group both morphologically and qualitatively. In the experimental group fibrocartilage cells appeared 6 weeks after operation, cartilage cells became more mature at 12 weeks, and articular cartilage was normal at 24 weeks. The result shows that the synovial flap implant obviously accelerates the meniscus regeneration and has an affect on prevention articular cartilage from degenerating.

Loss of function of Saccharomyces cerevisiae kinesin-related CIN8 and KIP1 is suppressed by KAR3 motor domain mutations

The kinesin-related products of the CIN8 and KIP1 genes of Saccharomyces cerevisiae redundantly perform an essential function in mitosis. The action of either gene-product is required for an outwardly directed force that acts upon the spindle poles. We have selected mutations that suppress the temperature-sensitivity of a cin8-temperature-sensitive kip1-delta strain. The extragenic suppressors analyzed were all found to be alleles of the KAR3 gene. KAR3 encodes a distinct kinesin-related protein whose action antagonizes Cin8p/Kip1p function. All seven alleles analyzed were altered within the region of KAR3 that encodes the putative force-generating (or "motor") domain. These mutations also suppressed the inviability associated with the cin8-delta kip1-delta genotype, a property not shared by a deletion of KAR3. Other properties of the suppressing alleles revealed that they were not null for function. Six of the seven were unaffected for the essential karyogamy and meiosis properties of KAR3 and the seventh was dominant for the suppressing trait. Our findings suggest that despite an antagonistic relationship between Cin8p/Kip1p and Kar3p, aspects of their mitotic roles may be similar.

PcnB is required for the rapid degradation of RNAI, the antisense RNA that controls the copy number of ColE1-related plasmids

The replication of ColE1-related plasmids is controlled by an unstable antisense RNA, RNAI, which can interfere with the successful processing of the RNAII primer of replication. We show here that a host protein, PcnB, supports replication by promoting the decay of RNAI. In bacterial strains deleted for PcnB a stable, active form of RNAI, RNAI*, which appears to be identical to the product of 5'-end processing by RNAase E, accumulates. This leads to a reduction in plasmid copy number. We show, using a GST-PcnB fusion protein, that PcnB does not interfere with RNAI/RNAII binding in vitro. The fusion protein, like PcnB, has polyadenylating activity and is able to polyadenylate RNAI (and also another antisense RNA, CopA) in vitro.

The pcnB gene of Escherichia coli, which is required for ColE1 copy number maintenance, is dispensable

The pcnB gene product of Escherchia coli is required for copy number maintenance of plasmids related to ColE1 and also for that of the IncFII plasmid R1. Because PcnB is similar to the tRNA-binding protein tRNA nucleotidyltransferase, we have suggested that the protein would be required only for processes in which an RNA is a prominent regulatory component. This appears to be so; strains deleted for pcnB, although defective in ColE1 and R1 plasmid maintenance, maintain the iteron-regulated plasmids F and P1 normally. We also find that strains deleted for pcnB grow normally, demonstrating that PcnB has no essential cellular role under the conditions tested and suggesting that regulation by antisense RNAs similar to RNAI has no critical role in any essential host process. We confirm by immunological tests that PcnB is likely to be the commercially available enzyme poly(A) polymerase.

[Memory function of patients with cerebral arteriosclerosis evaluated by Rivermead behavioural memory test]

Using Rivermead behavioural memory test, we examined 142 patients with cerebral arteriosclerosis. The results showed that the rate of anomalies of screening score in patients with cerebral arteriosclerosis were significantly higher than that of the control group (P < 0.01). The patients and control scores were significantly different (P < 0.05) in all items except the picture and face recognition. Comparing the screening score with brain CT scan, we found a relationship between brain damage and behavioural memory declination. Also, many persons of control group got low scores with behavioural memory test, suggesting that the Rivermead behavioural memory test be sensitive to memory declination. With its simplicity and sensitivity the Rivermead behavioural memory test may have some practical value in China.

Highly sensitive object location in tissue models with linear in-phase and anti-phase multi-element optical arrays in one and two dimensions

Based upon previous observations of low-frequency photon diffusion waves within highly scattering tissue, this paper explores the "near-field" phenomena of such waves of approximately 10-cm wavelength with 200-MHz phase modulation equipment. Multiple-element source arrays consist of laser diode sources modulated at 180 degrees out of phase with respect to the other sources. The diffusing waves originating from the out-of-phase sources give, in the midplane, an amplitude null and a sharp phase transition. These may be observed in a highly scattering intralipid medium simulating the breast or brain (0.5% intralipid), 3-5 cm from the transmitting laser diodes. In the plane containing the array, there is a high sensitivity for a small volume of a hidden absorber (indocyanine green) deep within a highly scattering medium; 20 pmol in a volume of 70 microliters can be detected. Two-dimensional arrays consisting of four or more elements in two orthogonal planes give sensitivity on both axes similar to the one-dimensional array. Measurements show that in the presence of a light-absorbing object, the amplitude null and the interference plane becomes a curved surface which is deflected toward the heterogeneity. The degree of deflection is related to the volume and the absorption characteristics of the heterogeneity and provides detection of the heterogeneity, and thereby may provide localization information for the detection of small tumors within the human breast, or stroke volumes, aneurysms, and tumors in the human brain.

Aberrations of p53 gene in human hepatocellular carcinoma from China

Allele losses and mutations have been examined in 38 cases of primary hepatocellular carcinomas (HCC) from different geographic areas of China by Southern, single-strand conformational polymorphism (SSCP) and direct DNA sequencing analyses. Two of 12 samples from Qi-Dong and six of 18 HCCs from Shanghai showed loss of heterozygosity (LOH) at the loci on chromosome 17p13.3. All of the nine mutations in the p53 gene detected in HCC from Qi-Dong were clustered at the third base of codon 249, i.e. G:C to T:A, leading to an arginine to serine change. In contrast, 18 HCC samples from Shanghai contained three mutations at codons 249, 255 and 279. These results suggested a relationship between the spectrum of p53 aberration and environmental risk factors in these two geographic areas. Since no correlation between the state of HBV DNA and p53 aberration was observed, other factors such as dietary exposure to aflatoxin B1 (AFB1) might be responsible for the mutational hotspot at codon 249 in HCCs from Qi-Dong area.

Mechanisms underlying chemoreceptor inhibition induced by atrial natriuretic peptide in rabbit carotid body

1. Previous studies in our laboratory revealed the presence of atrial natriuretic peptide (ANP) in preneural chemosensory type I cells of the cat carotid body, and demonstrated that submicromolar concentrations of the peptide inhibited carotid sinus nerve (CSN) activity evoked by hypoxia. In the present study, we have evaluated the role of the cyclic nucleotide second messenger, cyclic GMP (cGMP), and the involvement of type I cells in rabbit chemosensory inhibition. 2. Submicromolar concentrations of the potent ANP analogue, APIII, greatly elevated both the content and release of cGMP from the carotid body. Denervation experiments confirmed earlier immunocytochemical studies which suggested that APIII-induced cGMP production occurs almost exclusively in type I cells; these experiments also indicate that both the sympathetic and sensory innervation to the carotid body exert a trophic influence on the metabolism of this second messenger. 3. Submicromolar concentrations of APIII inhibited the CSN activity evoked by hypoxia (79.8 +/- 3.2% (mean +/- S.E.M.) inhibition with 100 nM APIII) and nicotine (74.5 +/- 3.6% inhibition with 100 nM APIII), but did not affect basal CSN activity established in 100% O2-equilibrated superfusion solutions. 4. The biologically inactive analogue of ANP, C-ANP, failed to produce CSN inhibition; however, the inhibitory effects of APIII were mimicked by cell-permeant analogues of cGMP (dibutyryl-cGMP and 8-bromo-cGMP, 2 mM), which likewise did not alter basal CSN activity. Because we found that unmodified cGMP was an ineffective inhibitor of CSN activity, our data suggest that APIII inhibition is mediated intracellularly by cGMP produced within the type I cells. 5. APIII does not inhibit the CSN activity produced by 20 mM K+ (in zero Ca2+ media), which very probably results from direct depolarization of the sensory nerve terminals. 6. Catecholamine release from the carotid body evoked by hypoxia is likewise not altered by APIII (100 nM). 7. The data are consistent with the notion that APIII and analogues of cGMP alter the release of excitatory and/or inhibitory transmitters from chemosensory type I cells in the carotid body.

Effect of stem cell factor on in vitro erythropoiesis in patients with bone marrow failure syndromes

Stem cell factor (SCF) enhances normal hematopoiesis. We examined its effect in vitro on bone marrow and blood progenitors from patients with inherited bone marrow failure syndromes, including 17 patients each with Diamond-Blackfan anemia (DBA) and Fanconi's anemia (FA), 3 with dyskeratosis congenita (DC), and 1 each with amegakaryocytic thrombocytopenia (amega) and transient erythroblastopenia of childhood (TEC). Mononuclear cells were cultured with erythropoietin (Ep) alone or combined with SCF or other factors. SCF increased the growth of erythroid progenitors in cultures from 50% of normal controls, 90% of DBA, 70% of FA, 30% of DC, and the amega and TEC patients; normal numbers were reached in 25% of DBA studies. Improved in vitro erythropoiesis with SCF in all types of inherited marrow failure syndromes does not suggest a common defect involving kit or SCF, but implies that SCF may be helpful in the treatment of hematopoietic defects of varied etiologies.

A high performance liquid chromatographic method for the determination of albuterol enantiomers in human serum using solid phase extraction and chemical derivatization

A high performance liquid chromatographic method was developed for the simultaneous assay of R(-)- and S(+)-albuterol in human serum. The assay involves solid phase extraction as a sample clean-up step and derivatization of racemic albuterol to its diastereomeric thioureas with 2,3,4,6-tetra-O-acetyl-alpha-D-glucopyranosyl isothiocyanate. Chromatographic separation was accomplished under isocratic conditions using an octadecylsilane column and a mobile phase consisting of 29:71 acetonitrile:distilled water containing 0.1% triethylamine, pH 4.0 (adjusted with concentrated phosphoric acid) at a flow rate of 0.8 mL/min. The diastereomers were detected using a fluorescence detector set at 223 nm excitation and no emission filter. Racemic bamethane was used as internal standard. Drug to internal standard peak-height ratios were linear over a 2-20 ng/mL range for each enantiomer. The limit of detection of each analyte was 1.0 ng/mL (S/N = 3).

Caudate Nucleus and Pain Modulation

The caudate nucleus has an antinociceptive function related to the opioid peptidergic activity of the periaqueductal gray. Intracaudate opioid peptides and acetylcholine promote acupuncture analgesia, whereas dopamine antagonises it.

Primary-structural and evolutionary analyses of the growth-hormone gene from grass carp (Ctenopharyngodon idellus)

The growth-hormone (GH) gene of grass carp, one of the fastest-growing species of farmed fish, was isolated and the DNA sequenced. Only one GH gene is found in this species. This gene, which is 2.5 kb in length, has five exons and four introns, in common with all of the mammalian and the recently published common-carp GH genes. In the course of vertebrate evolution, the total lengths of the intron and the non-coding region of exon 5 of the GH gene have been shortened by 40-70%, whereas the encoding exons of the gene have been slightly increased. The more closely related species exhibit the closest sequence similarity in their GH genes. For example, the similarity of the exons is 84.1-93.2% between grass carp and common carp (within the same family of Syprinedae), 43.5-82.1% between grass carp and rainbow trout (in different orders of Teleostei) and 45.8-58.6% between grass carp and rat (in different grades of Vertebrata). In addition, similar DNA domains, such as thyroid-hormone-receptor-complex-binding site and cell-type-specific cis elements involved in regulation of expression of rat and human GH genes, have been localized in the corresponding regions of the grass-carp GH gene.

Two Saccharomyces cerevisiae kinesin-related gene products required for mitotic spindle assembly

Two Saccharomyces cerevisiae genes, CIN8 and KIP1 (a.k.a. CIN9), were identified by their requirement for normal chromosome segregation. Both genes encode polypeptides related to the heavy chain of the microtubule-based force-generating enzyme kinesin. Cin8p was found to be required for pole separation during mitotic spindle assembly at 37 degrees C, although overproduced Kip1p could substitute. At lower temperatures, the activity of at least one of these proteins was required for cell viability, indicating that they perform an essential but redundant function. Cin8p was observed to be a component of the mitotic spindle, colocalizing with the microtubules that lie between the poles. Taken together, these findings suggest that these proteins interact with spindle microtubules to produce an outwardly directed force acting upon the poles.

Pure rhabdomyosarcoma of the corpus uteri in a postpartum patient: report of a case and review of the literature

Pure rhabdomyosarcomas originate in the female genital tract. They are uncommon and most often occur in infancy or childhood as sarcoma botryoides (embryonal rhabdomyosarcoma) which involve the vagina and cervix. Such tumors rarely occur in adults. A pure rhabdomyosarcoma of the uterus that arose in a postpartum patient is described. The pertinent literature is discussed.

Association of 2'-5' oligoribonucleotides

Oligoribonucleotides with 2'-5' linkages have been synthesized on solid support. UV melting and CD experiments indicate complementary strands associate to give complexes with melting temperatures 30 to 40 degrees C lower than for duplexes formed by 3'-5' oligoribonucleotides with the same sequence. UV melting and imino proton NMR spectra and NOEs for (2'-5') CGGCGCCG are consistent with formation of an antiparallel duplex. The results suggest greater duplex stability was one factor favoring 3'-5' over 2'-5' linkages in evolution.

Characterization of AluI repeats of zebrafish (Brachydanio rerio)

Two families of repetitive DNA sequences were isolated from the zebrafish genome and characterized. Eight different sequences were sequenced and classified by two standards, their (G + C) composition and their lengths. For convenience, the sequences were first divided into two types. Type I was (A + T)-rich, was repeated approximately 500,000 times, and constituted approximately 5% of the zebrafish genome. Type II was (G + C)-rich, was reiterated approximately 90,000 times, and comprised approximately 0.5% of the genome. Agarose gel electrophoresis of zebrafish DNA cleaved with AluI revealed three distinguishable bands of repetitive fragments: large (approximately 180 bp, designated RFAL), medium (approximately 140 bp, RFAM), and small (approximately 90 bp, RFAS). The RFAL fragments contained both type I and type II sequences. Limited digestion of genomic DNA indicated that RFAL and RFAM were tandemly arranged in the genome, whereas RFAS showed a mixed pattern of both tandem and interspersed repeated arrangements. Although inclusion of a repetitive sequence in a transgenic construct did not appreciably accelerate homologous integration of transgenes into the zebrafish genome, the AluI sequences could facilitate transgene mapping following chromosomal integration.

[Study of quantitative diagnosis of cerebral arteriosclerosis]

On the basis of clinical diagnostic criterion of cerebral arteriosclerosis, we selected, 72 patients with cerebral arteriosclerosis, 72 patients with suspected cerebral arteriosclerosis and 70 healthy individuals and screened 42 variables obtained from clinical and accessory examination with a stepwise discriminant analysis and a stepwise regression analysis. Finally we performed a logistic discriminant analysis of 15 selected variables in order to establish diagnostic discriminant formulas, Ya and Yc. It was found that a diagnostic coincidence rate for rediscriminant analysis of 212 individuals with the formulas was 100%. Very high sensitivity (96.7%), specificity (100%), positive predicted value (100%), negative predicted value (83.3%) and accuracy (97.1%) were noted in a prospective double-blind test on 34 subjects. The authors suggest that the discriminant formulas Ya and Yc established for diagnosis of cerebral arteriosclerosis be widely applicated.

Electroacupuncture enhances activity of adrenal nucleolar organizer regions in ovariectomized rats

Nucleolar organizer regions (NORs) may reflect the activity of cell differentiation and transcription of nucleolar rDNA; the present paper studied nucleolar organizer regions of the adrenal cortex to explore the regulatory effect of electroacupuncture (EA). Animals were divided into four groups, the ovariectomized electroacupuncture group (OV+EA group, n = 7), the ovariectomized group (OV group, n = 4), the EA group (n = 3) and the control group (CT group, n = 4). Number of AgNORs of 100 cells from zona fasciculata of the adrenal cortex in each case of the four groups was counted at random and the mean+/-SE (number/cell) in each group was calculated as follows: OV+EA group, 2.71 +/- 0.26, OV group, 1.26 +/- 0.15, EA group, 1.21 +/- 0.04 and CT group, 1.48 +/- 0.03. The mean of AgNORs in OV+EA group differed highly significantly from the other three groups (p less than 0.01) as tested with ANOVA and LSD method. No significant difference was found among the other three groups. Gross specimen examination showed that adrenals in the OV+EA group were significantly heavier than those in the other three groups (p less than 0.01). Vaginal smears showed that a response like estrogen-induced one with exfoliative cells appeared in the OV+EA group. EA had no significant effect on normal rats. The results suggest that EA may promote the synthesis and secretion of adrenal steriod hormones, the androgen of which will then be transformed into estrogen in other tissues, thus compensating the deficiency of estrogen induced by ovariectomy.

Alterations of spinal dorsal horn substance P following electroacupuncture analgesia--a study of the formalin test with immunohistochemistry and densitometry

Substance P (SP), released from thin afferent terminals, is believed to be a neurotransmitter for pain transmission in the spinal dorsal horn. It has been demonstrated that in addition to analgesia, morphine increases the accumulation of SP possibly due to the inhibition of its release. The present work investigated the level of spinal SP like immunoreactivity (SPLI) following electroacupuncture analgesia in rats using immunohistochemistry and image analysis. Experiment results revealed that formalin injected into the hind paw elicited marked pain response and accumulation of SP in the spinal dorsal horn. Electroacupuncture of Tsu-San-Li could depress the pain response, however increasing further the SP accumulation. It is thus suggested that pain stimulation itself may activate the endogenous opioid mechanism to inhibit SP release and acupuncture is able to enhance the process. This may be one mechanism of acupuncture analgesia.

EXPRESSION OF C-fos PROTEIN IN SEROTONERGIC NEURONS OF RAT BRAINSTEM FOLLOWING ELECTRO-ACUPUNCTURE

The c-fos proto-oncogene encodes a nuclear phosphoprotein, Fos which has been proposed to be a "third messenger" coupling short term extracellular signals to long term alteration in cell function. Using double labeling immunocytochemistry, the present work demonstrated the co-localization of Fos protein and serotonin in the nucleus raphe dorsalis, nucleus raphe centralis superior and rostral ventromedial medulla. The results pose an interesting problem, the possible relation of Fos protein to the biosynthesis of serotonin, awaiting further investigation.

[Allotransplantation of meniscus in dog's knee. An experimental study]

This experimental study was to show the difference and outcome of allotransplantation and autotransplantation of meniscus in dogs. In the experimental group (9 dogs), the lateral meniscus was removed and replaced by one preserved for 2 weeks in tissue culture. In the control group (9 dogs), the lateral meniscus was excised but was sutured back to the place immediately. The specimens in each group were taken at 3, 6, 12, and 24 weeks after operation, and were examined microangiographically and histologically under light microscope and electron microscope. The results in both groups showed that the meniscus united to the capsule, chondrocytes in the menisci were intact and the collagen fiber orientation was regular. The articular cartilage of the uncovered area of the tibial plateaus showed normal appearance, and vascular neogenesis in the meniscal periphery was found 12 weeks after operation. These observations suggest that allogenic meniscus maintains its original histologic pattern and functional behavior after its transplantation. It makes possible to protect the knee joint from osteoarthritis.

Sickle and thalassemic erythroid progenitor cells are different from normal

Blood erythroid progenitors (BFU-E) from patients with sickle and thalassemic syndromes were compared with those from normal individuals. The day of maximal colony formation in methyl cellulose was slightly later in the cultures from the patients with hemoglobinopathies than in the normal cultures. The number of colonies/100,000 mononuclear cells was similar in all cultures on day 13, but was higher in the hemoglobinopathy cultures on the day of maximal growth. The number of BFU-E/mL of blood was significantly higher than normal at all times in both sickle cell anemia and thalassemia. The proportional synthesis of gamma globin was twice normal in all sickle cultures, and 4 times normal in those from beta+-thalassemia. Hemin and interleukin-3 increased the numbers of erythroid colonies in all cultures, but did not consistently alter the globin synthesis patterns. Each progenitor population has a unique pattern in terms of time course, number of BFU-E, and level of gamma globin synthesis. These features indicate distinct types of BFU-E, or differences in accessory cells, or both, which distinguish blood-borne erythropoiesis in normals and those with hemoglobinopathies.

Nearest-neighbor parameters for G.U mismatches: [formula; see text] is destabilizing in the contexts [formula; see text] and [formula; see text] but stabilizing in [formula; see text]

Thermodynamic parameters derived from optical melting studies are reported for duplex formation by a series of oligoribonucleotides containing G.U mismatches. The results are used to determine nearest-neighbor parameters for helix propagation by G.U mismatches. Surprisingly, the [formula; see text] nearest-neighbor free energy increment in unfavorable in the contexts [formula; see text], and [formula; see text] but favorable in the context [formula; see text]. This is a non-nearest-neighbor effect. In contrast, the [formula; see text] free energy increment is favorable and independent of context. Circular dichroism and imino proton NMR spectra of several sequences do not reveal an obvious structural basis for this dichotomy. For example, all the G.U mismatches have two slowly exchanging imino protons. The imino resonances for the G.U mismatches in GGAGUUCC, GUCGUGAC, and CCUGUAGG, however, broaden at lower temperature than the imino resonances for the interior Watson-Crick base pairs. In contrast, the imino resonances for the G.U mismatches in GGAUGUCC remain sharp at high temperature. The improved parameters for G.U mismatches should improve predictions of RNA structure from sequence.

[Synthesis of hexamethyl propylamine oxime and comparative study of its diastereoisomers]

This is a report on the synthesis of hexamethyl-propylene-amine oxime (HM-PAO), a new agent for regional cerebral blood flow (gamma CBF) imaging, the separation of its diastereoisomers (dl- and meso-HM-PAO), and a comparative study of three forms of Tc- 99m labelled HM-PAO (dl-, meso- and mixture-) in chromatography, mice biodistribution and rabbit imaging. The results showed that the Rf value of Tc-99m-dl-HM-PAO (0.8-1.0) on silica G thin layer chromatography with MEK as solvent was different from that of Tc-99m-meso-HM-PAO (0.6-0.8), and that the retention of dl- isomer in the brain was higher and more static than those of meso-and mixture HM-PAO but identical with Ceretec, a dl-HM-PAO kit manufactured by Amersham Inc., England. The primary clinical applications for gamma CBF SPECT imaging demonstrated a satisfactory result.

Localization and in vitro actions of atrial natriuretic peptide in the cat carotid body

Previous studies of atrial natriuretic peptide (ANP) have indicated that its release from the heart and from discrete areas of the central nervous system evokes coordinated physiological and behavioral adjustments that mitigate the adverse hypertensive effects of volume overload and/or acute increases in sodium intake. Because the reflex activity initiated by arterial chemoreceptors of the carotid body directly contributes to the integrated regulation of systemic blood pressure, we have investigated the possibility that ANP has a significant role in the chemosensory process as well. Our immunocytochemical studies show that ANP-like immunoreactivity is present in the preneural chemosensitive type I cells in the cat carotid body. Furthermore we found that the biologically active ANP fragment atriopeptin III is a potent inhibitor of carotid sinus nerve activity evoked by hypoxia. Our findings suggest that circulating and/or endogenous ANP may modulate carotid body function as part of a coordinated response to changes in systemic volume and solute balance.

Modulation of endothelial cells fibrinolytic activity by platelets

Interaction between endothelial cells (EC) and platelets in culture was shown to regulate the fibrinolytic system of the aortic EC. Untreated porcine EC from aorta exhibited almost no net fibrinolytic activity and zymographic assay have shown a single fibrin lysis band of 105 kDa corresponding to a tPA-PAI complex. Incubation of aortic EC with intact platelets stimulated a cell-associated fibrinolytic activity of the urokinase type as evidenced by a plasminogen-dependent fibrin independent amidolytic activity, and the appearance of a new 48 kDa lysis band on zymography. However, in the culture medium of platelet-treated aortic EC, a new lysis band of 92 kDa appeared with no associated amidolytic activity suggesting that the 48 kDa plasminogen activator secreted by the aortic EC after treatment with platelets is complexed to the inhibitor PAI1. This modulation of fibrinolytic activity depends on the EC origin since it is not observed with pulmonary artery EC, and represents a new concept in fibrinolysis regulation by cell-cell interaction.

[The epidemiological study of esophageal cancer at Yangcheng County in Shanxi]

This paper indicated that counties with higher incidence of esophageal cancer in Shanxi were found to centre round Yangcheng, Jincheng, Qinshui etc. by means of an analysis of the gathered areas on mortality of esophageal cancer in every county or city in Shanxi. These form a higher incidence area of noticeable and centric distribution together with other counties in Henan and Hebei. In all towns in Yangcheng, however, there is no gathered areas. Since 1974, the observed tendency of esophageal cancer in Yangcheng has shown that the mortality ranges from 120-150/100,000, without change in male and in female. However, among the population, the mortality in male is always higher than in female. And it increases with age in people over 30 years. Hereditary epidemiological data at Yanli Town in the county has demonstrated that there is significant difference between the distribution of incidence and mortality of esophageal cancer and the probability of binomial distribution, showing obvious familiar gathering of esophageal cancer.

[An observation of the anticancer activity of mitoxantrone hydrochloride injection]

Experimental results of anticancer activity of DHAQ.HCl are reported in this paper. It was discovered that DHAQ.HCl, mitoxantrone hydrochloride, had an obvious anticancer effect on the experimental tumor strains:Ehrlich ascites cancer, Sarcoma-180, Leukemia P388, etc., and that it was more effective to Leukemia P388 than to other strains. The anticancer activity of DHAQ.HCl was better than DHAQ (P less than 0.05). No side effect was observed on the local sites (s.c.) of tumor planted or drug injected. And also a good anticancer effect was observed on the sites of tumor planted by local injection. It is suggested that this observation can provide some information on the choice of routes of administration of this drug clinically.