Intercellular Interactions of an Adipogenic CXCL12-Expressing Stromal Cell Subset in Murine Bone Marrow

Bone marrow houses a multifunctional stromal cell population expressing C-X-C motif chemokine ligand 12 (CXCL12), termed CXCL12-abundant reticular (CAR) cells, that regulates osteogenesis and adipogenesis. The quiescent pre-adipocyte-like subset of CXCL12⁺ stromal cells (“Adipo-CAR” cells) is localized to sinusoidal surfaces and particularly enriched for hematopoiesis-supporting cytokines. However, detailed characteristics of these CXCL12⁺ pre-adipocyte-like stromal cells and how they contribute to marrow adipogenesis remain largely unknown. Here we highlight CXCL12-dependent physical coupling with hematopoietic cells as a potential mechanism regulating the adipogenic potential of CXCL12⁺ stromal cells. Single-cell computational analyses of RNA velocity and cell signaling reveal that Adipo-CAR cells exuberantly communicate with hematopoietic cells through CXCL12-CXCR4 ligand-receptor interactions but do not interconvert with Osteo-CAR cells. Consistent with this computational prediction, a substantial fraction of Cxcl12-creER⁺ pre-adipocyte-like cells intertwines with hematopoietic cells in vivo and in single-cell preparation in a protease-sensitive manner. Deletion of CXCL12 in these cells using Col2a1-cre leads to a reduction of stromal-hematopoietic coupling and extensive marrow adipogenesis in adult bone marrow, which appears to involve direct conversion of CXCL12⁺ cells to lipid-laden marrow adipocytes without altering mesenchymal progenitor cell fates. Therefore, these findings suggest that CXCL12⁺ pre-adipocyte-like marrow stromal cells prevent their premature differentiation by maintaining physical coupling with hematopoietic cells in a CXCL12-dependent manner, highlighting a possible cell-non-autonomous mechanism that regulates marrow adipogenesis. © 2021 American Society for Bone and Mineral Research (ASBMR).     

The effect of culture on the sex differences in schizophrenia

Cultural influences on sex differences in clinical characteristics and symptomatology of schizophrenia were studied among 369 schizophrenic patients from the United States and Turkey. Male schizophrenics were more likely to be single, and were younger than female schizophrenics at onset of symptoms and when first diagnosed, treated and hospitalised in both cultures. Turkish male and female schizophrenics were more ambivalent, inappropriate, "silly", euphoric, depersonalised, dissociated, mute, conceptually disorganised, and exhibiting more flight of ideas and thought than American male and female schizophrenics. Irrelevant thought and stereotypic behaviour were most severe in Turkish male and American female schizophrenics. Hallucinatory behaviour was most intense in Turkish separated, divorced, or widowed female schizophrenics and American married male schizophrenics. Turkish married female and Turkish separated, divorced, or widowed male schizophrenics were most disoriented. Turkish single female schizophrenics were most mute. Turkish separated, divorced, or widowed male schizophrenics showed most intense stupor behaviour.     

鼻咽癌患者前列环素及血栓素与外周血细胞免疫状况

应用间接免疫荧光法和放射免疫法分别检测了 34例鼻咽癌患者外周血中淋巴细胞的数量和血浆前列环素(PGI2 )及血栓素 (TXA2 )的含量 ,并与正常对照组对比研究。结果显示 :鼻咽癌患者外周血中 CD4细胞减少 (P<0 .0 1) ,而 CD8细胞则明显升高 (P<0 .0 5 )。同时鼻咽癌患者血浆中 PGI2 和 TXA2 的稳定代谢产物 6 - keto- PGF1α及 TXB2分别比对照组升高 ,以 TXB2 升高更明显 (P<0 .0 5 )。提示鼻咽癌患者体内前列腺素类物质 PGI2 和 TXA2 与鼻咽癌患者机体细胞免疫功能有关 ,并对其作为一种可能性抑制因素在鼻咽癌细胞免疫中的作用进行了讨论     

哑铃形椎管肿瘤29例临床分析

回顾性分析我院从 1 990年 3月～ 1 998年 1 1月 2 9例哑铃形椎管肿瘤的诊治。所有病例经CT ,MRI确诊。MRI能提供多时向、多空间图像 ,故可视为诊断哑铃形椎管肿瘤最有价值的方法。除 2例拒绝手术治疗外 ,2 7例采用后正中或后外侧入路作Ⅰ期显微手术切除 ,疗效较满意。本文重点讨论了该肿瘤的临床表现特征 ,CT ,MRI检查和手术治疗的特点     

脑梗死患者急性期血小板膜糖蛋白表达的研究

目的　探讨脑硬死患者急性期血小板膜P -选择素 (CD6 2p)的表达及其与临床神经功能缺损程度的关系。方法　用流式细胞术测定 41例急性期脑梗死患者血小板膜CD6 2 p的表达。 结果　轻、中、重型脑梗死患者CD6 2 p的表达分别为 (1.38± 0 .2 9) %、(3.15± 1.5 8) %、(10 .46± 5 .0 7) % ,与正常对照组 (1.5 6± 0 .17) %比 ,轻型脑梗死患者CD6 2p的表达无显著性差异 (P >0 .0 5 ) ,中、重型脑梗死患者CD6 2 p的表达显著升高 (P <0 .0 5和0 .0 1)。结论　脑梗死患者急性期血小板膜CD6 2 p的表达与临床神经功能缺损程度有关。     

非小细胞肺癌放疗期间外周血细胞数的变化

目的　研究胸部受电离辐射后外周血细胞的变化特点。方法　选取１９９７ ～１９９８ 年非小细胞肺癌患者３０ 例。按１∶２ 配比年龄相似,性别相同的非放疗慢性病患者作为对照组。观察胸部外照射对外周血白细胞、淋巴细胞、血小板数的影响。ＮＳＣＬＣ以医用直线加速器６ ＭＶ－ Ｘ 线,常规分割放射治疗。射野包括肿瘤及其周围１ ～２ｃｍ 正常肺组织,同侧肺门以及纵膈,有时包括锁骨上区ＦＳＺ（Ｆｉｅｌｄｓｑｕａｒｅｚｏｏｍ） ７２ ～２４６ｃｍ２ ,剂量率２Ｇｙ／ｍｉｎ ,ＳＳＤ１００ｃｍ 。采用ＳＷＧＥＡＢＡＣ－ ９２０ 型血液细胞自动分析仪检测外周血白细胞、淋巴细胞、血小板数,并严格质量控制。结果　当吸收剂量１０Ｇｙ／５ｆ／ Ｗ ,ＮＳＣＬＣ外周血细胞数量开始下降;至２０ ～３０Ｇｙ／１０ ～１５ｆ／２ ～３ Ｗ 时,其外周血细胞数量降至低谷。并且上述３ 种细胞数量较之放疗前和对照组具有显著差异（ｔ＞ ２．５８ ,Ｐ＜ ０．０１）。另外,局部照射野＞ １００ｃｍ２ 组外周血白细胞数显著低于照射野为＜ １００ｃｍ２ 组,（ Ｆ＝６ ．４６,Ｐ＜ ０ ．０１）。在缩野和改侧斜野,放疗第四周（Ｄｔ＝ ４０Ｇｙ） 后,局部受损骨髓开始修复,受照区内的毒性产物被迅速稀     

EDTA-NaOH吸收液--分光光度法测定空气中硫化氢的研究

本文对EDTA -NaOH作为硫化氢吸收液进行探讨和研究。试验表明 :当空气中硫化氢含量为国家最高允许液度 0 .6～ 6倍时 ,吸收液采样效率为 98.2～ 10 0 % ,催化剂与显色剂混合使用 ,可降低空白值 ,提高方法灵敏度。本法准确度 ( p)为 93 .0 % ,精密度合并变异系数 (cv)为 3 .93 % ;检出限、测量限分别为 7× 10 -2 μg/5ml和1.7× 10 -1μg/5ml;规定采气量为 0 .5L时 ,则最小检出浓度为 0 .6 8mg/m3。     

益肾活血泄浊汤对大鼠系膜细胞转化生长因子β1表达的影响

探讨益肾活血泄浊汤及脂多糖 (LPS)对大鼠系膜细胞转化生长因子 β(TGF β)mRNA表达的影响。采用体外培养大鼠系膜细胞方法 ,分为益肾活血泄浊汤血清组、LPS病理组及空白组 ,并应用反转录多聚酶链反应技术 (RT PCR) ,观察TGF β1mRNA在各组间的表达情况。结果 :与空白组相比 ,LPS可显著刺激TGF β1的表达 ,而中药血清组较LPS组明显减弱。结论 :益肾活血泄浊汤能够显著降低转化生长因子 β1在系膜细胞中的表达。