The progressive accumulation of leukemic cells in acute myeloblastic leukemia (AML) results from the self-renewal capacity of leukemic blast progenitors. The growth of leukemic blast progenitors is supported by growth factors and colony-stimulating factors (CSFs) have been shown to stimulate this phenomenon in vitro. After repeated subculture of leukemic cells obtained from a patient with AML M4 in the presence of recombinant G-CSF, a cell line dependent on G-CSF was established. This cell line, designated OCI/AMLla, does not respond to GM-CSF, interleukin-3 (IL-3), IL-1 or stem cell factor as well as G-CSF. The stimulatory effect of G-CSF on OCI/AMLla cells is almost completely blocked by monoclonal anti-G-CSF antibody. With G-CSF added in the culture, the OCI/AMLla cell line has been growing exponentially for over 5 years now.
Another cell line, with growth dependent on IL-3, has also been established from a patient with chronic lymphocytic leukemia in the acute phase. This cell line TMD2 does not respond to G-CSF, GM-CSF, IL-1, or stem cell factor and anti-IL-3-antibody blocks the stimulatory effect of IL-3 on these cells. Receptors for IL-3 have been found on the surface of TMD2 cells. Although the TMD2 cell line is not derived from AML, the novel character of IL-3-dependency provides useful information for the study of the role of growth factor(s) in leukemic cell proliferation. These two CSF-dependent cell lines are expected to be excellent models for the investigation of the precise mechanism by which G-CSF and IL-3 stimulate the growth of leukemic cells. 相似文献
The aim was to investigate the association between temporomandibular disorders (TMD) and overall muscle tenderness, depressive symptoms, sleep difficulties, headache frequency and related symptoms in children with primary headache in comparison with controls. Based on an unselected population sample of 1135 Finnish schoolchildren classified according to the type of headache at age 12, altogether 297 children aged 13–14 from different headache groups and healthy controls were randomly selected for an interview and clinical examinations. Children with migraine had more TMD signs than children with nonmigrainous headaches or healthy controls. High TMD total scores were associated with palpation tenderness in other parts of the body and with frequent headache attacks. We conclude that children with overall headache, migraine in particular, and high total TMD scores showed an increased overall tenderness to muscle palpation and multiply manifested hypersensitivity pain. 相似文献
Objective: The purpose of this retrospective study is to evaluate a clinical diagnostic sign for disc displacement without reduction (DDWR), the absence of additional condylar translation during opening compared with protrusion.
Method: Thirty-eight electronic axiographic and magnetic resonance imaging (MRI) examinations of the TMJ were analyzed in order to compare the opening/protrusion ratio of condylar translation between non-painful DDWR and non-DDWR.
Result: According to the Mann-Whitney U test, the opening/protrusion ratio in non-painful DDWR differs significantly from non-DDWR (p < 0.0001).
Discussion: Among non-painful DDWR, there is no additional condylar translation during opening in comparison with protrusion, and this is probably also the case for DDWR without limited opening, which is a subtype that has not been validated by the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD). Comparative condylar palpation can analyze this sign, and therefore, further comparative investigations between MRI and clinical examination are needed to validate the corresponding clinical test. 相似文献
Objective: To determine the diagnostic accuracy of three screening questions (3Q/TMD) in relation to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD), in a specialized clinic.Material and methods: Consecutive patients,?>18 years, referred with a possible TMD complaint to the Orofacial Pain and Dysfunction clinic, Academic Centre for Dentistry Amsterdam, the Netherlands, were included in the study. All patients (n?=?449; mean age 44 years; 72% females), answered the 3Q/TMD and the DC/TMD questionnaire before a DC/TMD examination. The 3Q/TMD constitutes of two questions on weekly pain from the jaw, face and temple region (Q1), and on function (Q2), and one function-related question on weekly catching and/or locking of the jaw (Q3). Q1 and Q2 were evaluated in relation to a DC/TMD pain diagnosis and Q3 in relation to a subgroup of DC/TMD intra-articular diagnosis, referred to as the reference standard.Results: In total, 44% of patients received a pain-related DC/TMD diagnosis and 33% an intra-articular reference DC/TMD diagnosis. Sensitivity for the two pain screening questions was high (0.83–0.94), whereas specificity was low (0.41–0.55). For the function-related question, sensitivity was low (0.48), whereas specificity was high (0.96).Conclusions: In a specialized pain clinic, the two pain questions (Q1, Q2) are positive in most patients with pain-related TMD. Therefore, in case of a positive response, further diagnostic procedures for TMD pain are warranted. For the functional screening question (Q3), a positive response is indicative for an intra-articular DC/TMD diagnosis, while in case of a negative outcome, an intra-articular TMD might still be present. 相似文献
The authors evaluated the morphology and symmetry of the temporomandibular joint in participants with normodivergent and hyperdivergent skeletal class I, II, and III patterns.
Methods
A total of 80 participants were divided into 4 groups on the basis of their sagittal and vertical skeletal patterns. Cone-beam computed tomographic images were used to evaluate the condyle-fossa relationship and the morphology and symmetry of the mandibular condyle. One-way analysis of variance and Tukey post hoc tests were used to compare the mean values among the different groups.
Results
Participants with class II hyperdivergent patterns had the smallest anteroposterior (mean [standard deviation {SD}], 4.4 [1.6] millimeters) and mediolateral (10.5 [3.0] mm) condylar process widths among all 4 groups. The mean (SD) axial condylar angle was flatter in patients with class III hyperdivergent patterns (19.8° [5.1°]) compared with the other groups. The mean (SD) anteroposterior differences of the condylar processes (2.9 [1.4] mm) in patients with class III hyperdivergent patterns were the greatest in all 4 groups.
Conclusion
Participants in the group with class II hyperdivergent patterns have a smaller and narrower condyle compared with the other groups measured. Asymmetry was found among all groups, with participants with skeletal class III patterns having the most asymmetry. The most common condylar morphology in all groups examined was convex.
Practical Implications
These results support the concept that morphology and symmetry of the temporomandibular joint varies in different skeletal patterns, presumably as an adaptive response to functional demands. 相似文献
The authors conducted a systematic review and meta-analysis to determine whether arthrocentesis or arthroscopy combined with platelet-rich plasma (PRP) or platelet-rich growth factor (PRGF) injection compared with no injection or saline injection (control group) or hyaluronic acid (HA) injection reduced pain and increased maximum mouth opening (MMO) in patients with temporomandibular joint (TMJ) osteoarthritis (OA).
Types of Studies Reviewed
The authors used the Cochrane Library, Embase, PubMed, Web of Science, Google Scholar databases and hand searched reference lists through May 4, 2018, to identify randomized controlled trials and controlled trials including patients with TMJ OA receiving injections (PRP or PRGF versus other). The authors assessed the risk of bias according to the Cochrane guidelines.
Results
The authors screened 36 abstracts. They included 5 studies (3 randomized controlled trials and 2 controlled trials) with a total of 285 patients with TMJ OA in this review. The authors assessed all 5 studies as being at high risk of bias. The quality of evidence was very low owing to statistical heterogeneity, small sample size, or high risk of bias. Meta-analyses with 2 studies showed a visual analog scale pain improvement from baseline of ?2.778 units (0-10 scale, 0 = no pain, 10 = worst pain) favorable to PRP or PRGF compared with findings in control groups (95% confidence interval [CI], ?3.504 to ?2.052; P < .001) and an improvement of ?0.968 favorable to PRP or PRGF compared with findings in HA groups (95% CI, ?1.854 to ?0.082; P = .032). The authors found no significant increase in MMO in those receiving PRP or PRGF compared with that in the control or HA groups.
Conclusions and Practical Implications
Although the results of the included studies showed that arthrocentesis or arthroscopy with PRP or PRGF, saline, or HA injections all reduced pain and increased mouth opening, the evidence was of very low quality. Further studies are needed to confirm these preliminary results showing that PRP or PRGF with arthrocentesis or arthroscopy significantly improved pain but did not increase MMO compared with findings in the control or HA groups. 相似文献
Previous studies have shown that 5-HT3-antagonists reduce muscle pain, but there are no studies that have investigated the expression of 5-HT3-receptors in human muscles. Also, tetrodotoxin resistant voltage gated sodium-channels (NaV) are involved in peripheral sensitization and found in trigeminal ganglion neurons innervating the rat masseter muscle. This study aimed to investigate the frequency of nerve fibers that express 5-HT3A-receptors alone and in combination with NaV1.8 sodium-channels in human muscles and to compare it between healthy pain-free men and women, the pain-free masseter and tibialis anterior muscles, and patients with myofascial temporomandibular disorders (TMD) and pain-free controls.
Methods
Three microbiopsies were obtained from the most bulky part of the tibialis and masseter muscles of seven and six healthy men and seven and six age-matched healthy women, respectively, while traditional open biopsies were obtained from the most painful spot of the masseter of five female patients and from a similar region of the masseter muscle of five healthy, age-matched women. The biopsies were processed by routine immunohistochemical methods. The biopsy sections were incubated with monoclonal antibodies against the specific axonal marker PGP 9.5, and polyclonal antibodies against the 5-HT3A-receptors and NaV1.8 sodium-channels.
Results
A similar percentage of nerve fibers in the healthy masseter (85.2%) and tibialis (88.7%) muscles expressed 5-HT3A-receptors. The expression of NaV1.8 by 5-HT3A positive nerve fibers associated with connective tissue was significantly higher than nerve fibers associated with myocytes (P < .001). In the patients, significantly more fibers per section were found with an average of 3.8 ± 3 fibers per section in the masseter muscle compared to 2.7 ± 0.2 in the healthy controls (P = .024). Further, the frequency of nerve fibers that co-expressed NaV1.8 and 5-HT3A receptors was significantly higher in patients (42.6%) compared to healthy controls (12.0%) (P < .001).
Conclusions
This study showed that the 5-HT3A-receptor is highly expressed in human masseter and tibialis muscles and that there are more nerve fibers that express 5-HT3A-receptors in the masseter of women with myofascial TMD compared to healthy women. These findings indicate that 5-HT3-receptors might be up-regulated in myofascial TMD and could serve as potential biomarkers of chronic muscle pain. 相似文献