化疗对乳腺癌患者外周血CD4~+CD25~+CD127~-调节性T细胞的影响

目的观察化疗对乳腺癌患者外周血免疫指标的变化并探讨其影响。方法采用流式细胞术分析129例乳腺癌患者化疗前后CD4+CD25+CD127-调节性T细胞占CD4+T细胞的比率及T淋巴细胞亚群CD3、CD4、CD8;B淋巴细胞CD19;NK细胞(CD16+CD56)和CD4/CD8比值的动态变化。结果化疗后的乳腺癌患者CD4+CD25+CD127-调节性T细胞占CD4+细胞比率较化疗前降低,T淋巴细胞亚群中CD3、CD4、CD4/CD8增高,CD8、NK和CD19降低;乳腺癌患者外周血调节性T细胞的数量与临床分期和组织分化程度相关。结论乳腺癌患者化疗后调节性T细胞的数量降低,免疫调节抑制功能下降,免疫功能得到提高,但体液免疫及NK功能未见提高。     

艾滋病患者合并苍白密螺旋体感染的临床研究

目的 探讨人类免疫缺陷病毒(HIV)和苍白密螺旋体(TP)混合感染的临床特点.方法 收集45份HIV/TP合并感染血清和57份单纯HIV阳性血清和全血,进行淋巴细胞、血常规、肝功能等检测,分析两组实验室检测指标的差异.结果 HIV/TP合并感染患者外周血单核细胞数为(431.6±127.8)109/L,HIV感染者为(527.0±156.2)109/L,两组差异有统计学意义(t=2.116,P＜0.05),两组间其他检测指标T(CD3+)细胞、CD4+、CD8+T淋巴细胞数、CD4 +/CD8+比值、B淋巴细胞、NK细胞、白细胞计数、淋巴细胞、红细胞、血小板、血红蛋白、丙氨酸转氨酶、白蛋白、γ-谷氨酰转肽酶、总胆汁酸及总胆红素差异均无统计学意义.结论 HIV/TP合并感染患者外周血单核细胞显著低于单纯HIV感染者,测定HIV/TP患者外周血单核细胞变化,有助于评价合并感染患者感染的免疫状况.     

慢性乙型肝炎患者T淋巴细胞亚群与自然杀伤细胞活性分析

目的 分析慢性乙型肝炎患者外周血T淋巴细胞亚群与自然杀伤细胞(NK)的活性变化.方法 应用流式细胞技术分别检测35名健康入(A组)、31例乙型肝炎病毒携带(B组)、32例慢性乙型肝炎患者(C组)、30例急性乙型肝炎患者(D组),外周血T淋巴细胞CD4+、CD8+以及NK细胞,并分析各组间免疫细胞表达差异性.结果 C、D组CD4+ T淋巴细胞平均值为(32.45±10.45)％、(29.54±11.55)％较A、B组的(38.05±10.15)％、(37.17±11.22)％,明显降低,而CD8+ T淋巴细胞平均值为(36.15±11.56)％、(38.45±10.35)％,较A组的(30.14±11.25)(％),明显升高(P＜0.01); NK细胞则表现为C、D组平均值为(15.23±6.38)％、(12.07±5.95)％,较A、B组的(22.05±7.15)％、(20.32±7.67)％,明显降低(P＜0.05),以D组降低最为明显,A、B组差异无统计学意义.结论 慢性乙型肝炎和急性乙型肝炎患者外周血CD4+T淋巴细胞、NK细胞百分比降低,CD8+ T淋巴细胞升高;通过T淋巴细胞和NK细胞百分比检测可监测慢性乙型肝炎患者的免疫状态,为临床治疗时机的选择提供免疫学依据.     

流行性出血热T淋巴细胞亚群及DP细胞异常改变

目的 研究流行性出血热（EHF）患者T淋巴细胞改变特点,探讨其发病机制,提高对流行性出血热的早期诊断水平。方法 收集医院30例确诊为流行性出血热患者和50名健康献血员的抗凝血,用特异性荧光抗体标记,通过流式细胞仪检测其T淋巴细胞亚群变化,对其中25例恢复后的流行性出血热患者复查淋巴细胞亚群。结果 与正常人相比,流行性出血热患者的CD^4＋T淋巴细胞数量减少,CD8^＋T淋巴细胞数量增多,CD4^＋CD8^＋双阳性细胞（DP细胞）数量增多;恢复期EHF患者的T4、T8和DP细胞恢复正常;与HIV、EBV、及CMV感染者相比,EHF患者的DP细胞明显升高。结论 EFH急性期患者的CD4^＋T淋巴细胞数量降低,CD8^＋T淋巴细胞数量增多,DP细胞数量增多,但可逆转;T4、T8细胞和DP细胞检测有助于早期诊断EHF患者。     

大鼠急性胰腺炎模型脾脏免疫状态的研究

目的 检测大鼠急性胰腺炎模型外周血及脾脏T淋巴细胞亚群，探讨急性胰腺炎病情发展过程中脾脏免疫功能状态的改变。方法 雄性SD大鼠随机分为对照组和实验组，胰管内逆行注射4％牛磺胆酸钠建立实验组胰腺炎模型，两组分别在3、6、12h分3批处死，每批12只。每只大鼠取胰腺组织观察病理改变，取股静脉血2ml及脾脏2g制成单细胞悬液，用流式细胞仪测定T淋巴细胞亚群CD3^ 、CD4^ 、CD8^ 及CD4^ ，／CD8^ 比值。结果 在胰腺组织炎性水肿阶段T淋巴细胞亚群无明显改变，在出血坏死阶段外周血CD3^ 、CD4^ 降低、CD8^ 轻度升高、CD4^ ／CD8^ 明显降低，脾脏细胞与外周血相比CD3^ 、CD4^ 及CD4^ ／CD8^ ，明显降低，脾脏呈现负性免疫状态，且随着炎症的加重变化更加明显。结论脾脏在重症急性胰腺炎中起负性免疫作用，加重SAP病情发展。     

The lymphocyte populations and their migration into the central nervous system in tick-borne encephalitis

In tick-borne encephalitis (TBE) the cerebrospinal fluid (CSF) cytosis is dominated by T CD3+CD4+ and T CD3+CD8+ lymphocytes, but their pathogenetic roles and mechanisms of migration into central nervous system (CNS) are unclear. Currently, we have studied CSF lymphocyte subsets and chemotactic axes in TBE patients stratified according to the clinical presentation. Blood and CSF were obtained from 51 patients with TBE (presenting as meningitis in 30, meningoencephalitis in 18 and meningoencephalomyelitis in 3), 20 with non-TBE meningitis and 11 healthy controls. We have studied: (1) abundances of the main lymphocyte subsets and (2) CXCR3 and CCR5 expression on CD3+CD4+ and CD3+CD8+ lymphocytes cytometrically with fluorochrome-stained monoclonal antibodies; (3) concentrations of chemotactic cytokines: CCL5 (CCR5 ligand), CXCL10 (CXCR3 ligand), IL-16, CCL2, CCL20 and CXCL5 with ELISA. Cytokine concentrations were additionally studied in 8 pediatric TBE patients. Data were analyzed with non-parametric tests, p < 0.05 considered significant. The higher CSF lymphocyte counts were associated with symptoms of CNS involvement, especially with altered consciousness (B, Th and Tc cells) and focal neurologic deficits (B cells). The minor fraction of double-positive T CD4+CD8+ cells was unique in associating negatively with encephalitis and altered consciousness. CSF CD3+CD4+ and CD3+CD8+ lymphocyte population was enriched in CCR5-positive cells and CCL5 concentration in CSF was increased and associated with a milder presentation. Although CXCL10 was vividly up-regulated intrathecally and correlated with CSF T lymphocyte counts, the CXCR3 expression in CSF T lymphocytes was low. Serum and CSF concentrations of CCL2, CXCL5 and IL-16 were increased in adult TBE patients, CCL2 created a chemotactic gradient towards CSF and both CCL2 and IL-16 concentrations correlated positively with CSF lymphocyte counts. The particular lymphoid cell populations in CSF associate differently with the clinical presentation of TBE, suggesting their distinct roles in pathogenesis. CCR5/CCL5 axis probably contributes to T lymphocyte migration into CNS. CXCL10 mediates the intrathecal immune response, but is probably not directly responsible for T cell migration. Additional chemotactic factors must be involved, probably including CCL2 and IL-16.     

剖宫产术后切口感染炎性指标与免疫应激的相关性

目的分析剖宫产术后切口感染患者炎性指标与免疫应激的相关性。方法选取2017年1月-2019年12月天津市第五中心医院96例剖宫产术后切口感染患者为研究组,选取100例未发生术后切口感染的剖宫产产妇为对照组。对两组产妇术前及术后3 d血清白细胞介素(IL)-6、IL-1、IL-8、肿瘤坏死因子(TNF)-α、血管紧张素Ⅱ(AT-Ⅱ)、皮质醇(Cor)、胰岛素(INS)、去甲肾上腺素(NE)水平及外周血CD8⁺T淋巴细胞比例、CD4⁺T淋巴细胞比例、自然杀伤细胞(NK)比例进行检测和分析。结果研究组产妇术后血清炎症因子、应激激素水平及外周血CD8⁺T淋巴细胞比例均较术前上升,外周血CD4⁺T淋巴细胞比例、NK细胞比例均较术前下降,手术前、后上述指标变化幅度均高于对照组,差异均有统计学意义(P<0.05)。感染患者血清炎症因子水平与血清应激激素水平及外周血CD8⁺T淋巴细胞比例均呈正相关关系(P<0.05),与外周血CD4⁺T淋巴细胞比例、NK细胞比例均呈负相关关系(P<0.05)。结论剖宫产术后切口感染患者血清炎性因子表达上调与细胞免疫功能下降、应激指标相关,其炎症状态可能与免疫应激损害有关,临床医生应积极采取有效措施维持其机体稳态,从而达到促进康复、改善预后的目的。     

手术前后卵巢癌患者外周血T细胞亚群及CD4~+CD25~+调节性T细胞表达及临床意义

目的:探讨手术前后卵巢癌患者外周血T细胞亚群及CD4+CD25+调节性T细胞的变化及其临床意义。方法:采用流式细胞术检测80例卵巢癌患者外周血T淋巴细胞亚群、NK细胞及CD4+CD25+调节性T细胞水平。结果:与对照组相比,卵巢癌患者外周血中CD3+,CD4+,CD4+/CD8+比值及NK细胞含量均降低(P0.05),CD8+升高(P0.05);随着疾病进展Ⅲ期+Ⅳ期与Ⅰ期+Ⅱ期比较CD3+,CD4+,CD4+/CD8+比值及NK细胞含量均降低(P0.05),CD8+升高(P0.05)。卵巢癌患者外周血CD4+CD25+细胞比例高于正常对照组(P0.05);手术后卵巢癌患者T细胞亚群比例与术前比较并未明显恢复(P0.05),但CD4+CD25+调节性T细胞水平有所恢复(P0.05)。结论:卵巢癌患者免疫功能低下,术后短期并不能恢复,CD4+CD25+调节性T细胞水平升高,术后明显恢复,提示其在免疫耐受中起重要作用。     

Changes in natural killer cell subpopulations in lead workers

To investigate the effects of lead on human immune system, we analyzed T cell subpopulations (CD4+, CD8+ and CD3+ cells), natural killer (NK) cell subpopulations (CD16+ and CD57+ cells) and B (CD19+) cells in peripheral blood in 29 male lead workers. All were engaged in manufacturing lead stearate in a chemical factory. They were aged 23–74 (mean 49) years. Their blood lead concentrations (PbB) were between 7 and 35 (mean 18) μg/dl. They were divided into two groups according to their PbB: a high-PbB group (?20?μg/dl), and a low-PbB group (<20?μg/dl). The control group consisted of 19 “healthy” male workers without a history of occupational exposure to lead or to other hazardous substances, aged 48–67 (mean 58) years. The number and percentage of CD16+ cells in the high-PbB group were significantly lower than those in the controls and in the low-PbB group. There was significant negative correlation between the number of CD16+ cells and PbB in the lead workers. The percentage of CD8+ cells in the high-PbB group was larger than that in the controls and in the low-PbB group. It is suggested that the CD16+ NK cell should be a major site of the effects of lead on lymphocyte subpopulations.     

乙型肝炎病毒感染者外周血T细胞亚群和穿孔素-颗粒酶变化

目的探讨HBV感染者外周血单个核细胞(PBMC)中T淋巴细胞亚群分布频率及穿孔素和颗粒酶B表达的变化。方法通过细胞表面标记和细胞内细胞因子染色技术,采用流式细胞术分析HBV感染者PBMC中CD4+、CD8+T细胞的分布以及穿孔素和颗粒酶B的表达。结果与正常对照相比,急性和慢性乙肝患者CD4+T细胞百分率无明显改变,CD8+T细胞以及穿孔素和颗粒酶B表达均显著增高(前者P<0.01,后者P<0.05)。HBV携带者CD4+T细胞显著降低(P<0.05),CD8+T无明显改变。三组CD4+/CD8+T比例均显著降低(P<0.05)。结论与HBV携带者不同,急性和慢性乙肝患者CD8+T细胞频数及穿孔素和颗粒酶B表达均明显增高,提示细胞毒T细胞的数量及细胞毒颗粒表达与病毒清除和肝损害相关;急性和慢性患者在增高程度上的差异提示慢性乙肝的细胞免疫和细胞毒反应的不完全。     

三氯乙烯药疹样皮炎患者及健康接触工人外周血淋巴细胞亚群分析

目的 研究二氯乙烯(TCE)对接触工人淋巴细胞亚群的影响,寻找TCE药疹样皮炎早期的免疫学效应标志物.方法 选取TCE药疹样皮炎患者28例(病例组),来自发生病例车间的健康ICE作业工人56名(接触组)和未从事过TCE作业的健康工人28名(非接触对照组)作为研究对象.所有研究对象采集静脉血2 ml,EDTA抗凝处理,应用流式细胞技术检测淋巴细胞各亚群的百分比,结合血常规检测结果计算T细胞、CD4+T细胞、CD8+T细胞、B细胞、自然杀伤(NK)细胞绝对数及CD3+ CD4 +/CD3+ CD8+比值,比较各组之间外周血淋巴细胞业群的变化情况.结果 病例组外周血淋巴细胞总数、T细胞、CD4+T细胞、CD8+T细胞绝对数(中位数依次为2810.00、1846.17、831.87、904.05个/μl全血)均明显高于接触组(中位数依次为2101.00、1218.59、643.87、482.81个/μl全血,Z值分别为-3.19、-4.96、-3.22、-4.99,P值均＜0.001)和非接触对照组(中位数依次为1900.00、1223.60、558.60、325.80个/μl全血,Z值分别为- 3.30、-4.46、-3.45、-5.03,P值均＜0.001);病例组CD3+ CI4+/CD3+ CD8+比值和NK细胞绝对数(中位数分别为1.11、255.50个/μl全血)明显低于非接触对照组(中位数分别为1.96、642.60个/μl全血,Z值分别为-3.11、-3.56,P值均＜0.01);接触组CD8+T细胞数(中位数为482.81个/μl全血)明显高于非接触对照组(中立数为325.80个/μl全血,Z=-2.63,P值＜0.01);接触组CD3+ CD4+/CD3+ CD8+比值和NK细胞数(中位数分别为1.27、318.76个/μl全血)均明显低于非接触对照组(中位数分别为1.96、642.60个/μl全血,Z值分别为-2.29、-3.52,P值均＜0.05).结论 TCE接触可导致作业工人外周血淋巴细胞亚群发生变化;总淋巴细胞、T细胞和CD4+T细胞计数升高可作为TCE药疹样皮炎早期的免疫学效应标志物.     

烹调烟雾对人体免疫功能的影响

目的　通过对烹调烟雾职业暴露人群外周血免疫指标的测定了解烹调烟雾对机体免疫功能的影响。方法　对被试者 70人 ,其中暴露组 41人 ,对照组 2 9人。分别通过流式细胞仪直接荧光法、四甲基偶氮唑盐 (MTT)比色法、放射免疫分析法、生物素 -亲和素双抗体夹心酶联免疫吸附 (ABC- EL ISA)技术分析人外周血 T、B淋巴细胞及亚群、自然杀伤细胞 (NK细胞 )活性、白细胞介素 - 2 (IL- 2 )、γ-干扰素 (IFN- γ)水平。结果　经成组 t检验 ,暴露组 CD3+细胞百分率、NK细胞杀伤率明显低于对照组 (P<0 .0 1) ,工龄 7年以上被调查者中暴露组 CD4+ CD8- T细胞百分率、CD4+ / CD8+细胞比值明显低于对照组 (P<0 .0 5 ) ;而 CD8+ CD4- T、CD19+细胞百分率、IL- 2、IFN- γ水平两组间差异无统计学意义 (P>0 .0 5 )。结论　长期接触烹调烟雾对机体细胞免疫功能有一定抑制作用     

HBV感染者外周血T细胞亚群的研究

目的分析乙型病毒肝炎（HBV）感染者外周血T细胞亚群的特征及病程不同阶段的变化及意义。方法采用流式细胞仪对112例HBV感染者的外周血T细胞亚群进行检测,与正常对照组相比较。结果慢性乙肝、肝硬化患者的外周血CD4＋T细胞、CD8＋T细胞百分比及CD4＋TA2D8＋T较急性肝炎组及正常对照组明显减少;HBV—DNA阳性组、HBeAg阳性组外周血CD4＋T细胞、CD8＋T细胞百分比及CD4＋T／CD8＋T较正常对照组明显减少。结论HBV感染者体内存在T淋巴细胞亚群失衡和细胞免疫功能紊乱。外周血T淋巴细胞亚群与乙肝病毒感染的慢性化及肝病的临床发生、发展有关。     

传染性单核细胞增多症患儿的T细胞免疫改变

[目的]探讨传染性单核细胞增多症（IM）患者细胞免疫功能的动态变化规律。[方法]通过流式细胞技术,检测76例确诊IM患者的急性期及恢复期血清中总T淋巴细胞（CD3）、T辅助细胞（CD4）和T抑制细胞（CD8）的水平进行分析,并与正常对照组比较。[结果]急性期CD3^＋、CD8^＋T淋巴细胞显著升高,CD4^＋淋巴细胞和CD4/CD8比值明显下降,存在着细胞免疫功能紊乱。在疾病的恢复期,虽CD8淋巴细胞有所下降,CD4淋巴细胞和CD4/CD8比值升高,但与对照组比较差异有统计学意义,机体的细胞免疫功能紊乱贯穿整个病程。[结论]检测外周血T淋巴细胞亚群表达对评估IM患儿的免疫功能状况、疾病的诊断及病情严重度判断都具有重要的临床意义。     

甲状腺乳头状癌肿瘤微环境中T淋巴细胞各亚群的分布

目的分析甲状腺乳头状癌（PTC）肿瘤微环境T淋巴细胞各亚群的相对分布。方法应用流式细胞术测定35例PTC患者、25例良性甲状腺病变的局部肿瘤组织以及15例健康体检者外周血CD3^＋ CD4^＋ CD8^-、CD3^＋ CD4^- CD8^＋、CD3^＋CD4^＋CD8^＋、CD3^＋CD4^-CD8^-各T细胞亚群的水平及CD4^＋／CD8^＋比值。结果外周血、良性组和PTC肿瘤微环境的CD4^＋／CD8^＋比值明显依次递减（P〈0．01）；PTC和良性组局部组织间的CD3^＋CD4^＋CD8^＋细胞水平显著高于外周血（P〈0．01），但前二者间的CD3^＋CD4^＋CD8^＋细胞水平差异无统计学意义（P〉0．05）；良性组的CD3^＋CD4^-CD8^-细胞水平显著高于PTC局部和外周血（P〈0．01），后二者间的CD3^＋CD4^-CD8^-细胞水平的差异无统计学意义（P〉0.05）；15例伴淋巴结转移PTC局部癌组织的CD4^＋／CD8^＋比值及CD3^＋CD4^＋CD8^-、CD3^＋CD4^-CD8^＋、CD3^＋CD4^＋CD8^＋、CD3^＋CD4^-CD8^-各T细胞亚群的水平与20例无淋巴结转移的PTC局部癌组织之间的差异无统计学意义（P〉0．05）。结论PTC肿瘤微环境免疫细胞以CD8^＋阳性T细胞为主，局部呈明显的免疫受抑状态，而甲状腺良性病变局部CD3^＋CD4^＋CD8^＋、CD3^＋CD4^-CD8^-T细胞的显著增多可能有利于营造抗瘤免疫效应的微环境，PTC肿瘤微环境中T淋巴细胞各亚群的分布与淋巴结癌转移与否无关。     

不同苯作业工龄慢性苯中毒患者T淋巴细胞亚群损伤情况调查

[目的]探讨慢性苯中毒患者T淋巴细胞亚群变化及接苯作业工龄对其的影响。[方法]2008年,在济南医院门诊、病房选取68例慢性苯中毒(轻度中毒25例、中度中毒15例、重度中毒28例)患者和20名正常对照者,应用流式细胞仪检测的外周血T淋巴细胞亚群。[结果]轻、中、重度慢性苯中毒患者的红细胞计数、白细胞计数、血红蛋白值、血小板计数、中性粒细胞均低于正常对照组(P<0.01)。轻度、中度、重度慢性苯中毒者,CD4+值和CD4+/CD8+值,均为接苯工龄5～30年的低于<5年的(P<0.01)。[结论]苯作业工龄越长的慢性苯中毒患者细胞免疫功能的损伤程度越严重。     

婴幼儿营养性缺铁性贫血的T—淋巴细胞亚群的实验研究

为进一步了解营养性缺铁性贫血与细胞免疫功能的关系,本文测定了44名营养性缺铁性贫血(IDA)婴幼儿的T—淋巴细胞亚群的阳性细胞百分数,并选择了28名健康幼儿为对照组(C组).结果显示缺铁性贫血组(IDA)的CD_3~+％和CD_4~+％较正常对照组明显降低(P<0.01).且与血红蛋白的水平呈显著的正相关(r_1=0.6427,r_2=0.5974 P<0.005);CD_3~+％在正常对照组和缺铁性贫血组间无显著性差异(P<0.05),缺铁性贫血组的CD_4/CD_3比值较正常对照组明显降低,但与血红蛋白的水平无关.提示营养性缺铁贫血的细胞免疫功能低下与CD_3~+％和CD_4~+％降低有关,也是营养性缺铁性贫血易患各种感染性疾病的重要原因之一.     

Immune markers and ornithine decarboxylase activity among electric utility workers

The effects of a 60-Hz magnetic field (MF) exposure on white blood cell ornithine decarboxylase (ODC) activity, natural killer (NK) cell activity, lymphocyte phenotypes, and differential cell counts were studied among 60 electric utility workers. Personal MF exposure monitoring over 3 consecutive workdays was followed by collection of a peripheral blood sample. There were no MF-related changes in NK activity or the number of circulating neutrophils, eosinophils, basophils, or T-lymphocytes (CD4, CD8, CD4:CD8 ratio). MF exposure intensity was associated with decreased ODC activity (P<0.01) and lower NK cell counts (P=0.04). Melatonin production, which stimulates the immune system, was quantified on the night preceding immune marker determinations. Exposure-related reductions in ODC activity, NK and B cells, and monocytes were strongest among workers with reduced melatonin production. The biological significance or long-term health consequences associated with these changes are not known.     

胃癌患者外周血淋巴细胞免疫功能的变化及临床意义

目的检测胃癌患者外周血淋巴细胞免疫功能的变化,探讨其与胃癌新临床病理分期(TNM)及组织病理学分级的关系。方法流式细胞仪测定胃癌患者及正常对照组外周血淋巴细胞亚群及NK细胞数量。结果胃癌患者外周血CD3+、CD4+、NK、CD19+细胞数量及CD4+/CD8+比值较正常对照组明显下降(P<0.01),而CD8+细胞水平显著升高(P<0.01)。Ⅲ～Ⅳ期患者的CD3+细胞数、CD4+/CD8+比值、NK细胞数降低(P<0.05)。胃癌组织的分化程度与细胞免疫功能无明显相关性。结论胃癌患者外周血淋巴细胞免疫功能低下,且临床病理分期越晚,其免疫功能越低。检测淋巴细胞亚群、NK细胞可用于胃癌患者的免疫状态监测。     

Changes in the immune system of female sunbathers due to the effect of natural UV radiation

Exposure to UV radiation may cause health hazards and suppress immune responses. The aim of this study was to evaluate whether recurrent suberythemal doses of natural UV radiation can have a harmful effect on the lymphocyte subpopulations of local sunbathers. Sixteen healthy local female volunteers at the age of 23 to 44 recurrently sunbathed during the summer of 2000 in the Pärnu beach area (58°22′N, 24°31′E). They were informed of the actual UV index and encouraged to gather only suberythemal UV doses. Before and after the sunbathing period the CD3⁺, CD3⁺CD4⁺, CD3⁺CD8⁺, CD19⁺, CD3⁻CD16⁺CD56⁺, CD4⁺CD25⁺, CD4⁺HLA-DR⁺ and CD3⁺HLA-DR⁺ cells were determined in the peripheral blood of the volunteers. A statistically significant increase in the CD4⁺CD25⁺ and CD3⁺HLA-DR⁺ cells and a decrease in the CD3⁻CD16⁺CD56⁺ cells were detected. However, all changes remained in the normal range and there were no serious deviations in the composition of lymphocyte subpopulations. It was concluded that suberythemal doses of UV radiation gathered by volunteers had apparently no harmful effect on the immune system.