Chronic exposure of human macrophages in vitro to morphine and methadone induces a putative tolerant/dependent state.
نویسندگان
چکیده
We have shown previously that whereas acute exposure of cultured murine peritoneal macrophages inhibits phagocytosis, chronic exposure results in a putative tolerant/dependent state. We now report similar observations using human cultured monocyte-derived macrophages (hMDM) from a control population and from methadone patients. With hMDM, acute exposure to morphine and methadone inhibited phagocytosis in a dose-dependent manner. In contrast, chronic exposure resulted in eventual normalization of phagocytosis, indicating that a putative tolerant state to the opiates had developed. When opiates were withdrawn from chronically-exposed, tolerized hMDM, phagocytosis was once again depressed. The duration of withdrawal-induced depression lasted several hours, which is much longer than evidenced previously with murine macrophages. These data identify well with various in vivo studies on immune effects of opiate withdrawal; and, in so-doing, supplement ongoing speculation that opiate withdrawal is likely to have serious impact on host defenses of street heroin addicts.
منابع مشابه
اثر تزریق مزمن مرفین در دوره نوزادی بر تشنج حاصل از پنتیلن تترازول در دوره قبل از بلوغ موشهای صحرایی
Background & Aims: Frequent administration of morphine leads to increase in motor activity, motivational properties, and other responses related to this kind of drugs. It has been reported that the impact of morphine on seizure is dose dependent. The aim of this study was to study the impact of chronic exposure to morphine on pentylenetetrazol-induced seizure in rats. Materials & Methods: Neon...
متن کاملProteome Analysis of Rat Hippocampus Following Morphine-induced Amnesia and State-dependent Learning
Morphine’s effects on learning and memory processes are well known to depend on synaptic plasticity in the hippocampus. Whereas the role of the hippocampus in morphine-induced amnesia and state-dependent learning is established, the biochemical and molecular mechanisms underlying these processes are poorly understood. The present study intended to investigate whether administration of morphine ...
متن کاملProteome Analysis of Rat Hippocampus Following Morphine-induced Amnesia and State-dependent Learning
Morphine’s effects on learning and memory processes are well known to depend on synaptic plasticity in the hippocampus. Whereas the role of the hippocampus in morphine-induced amnesia and state-dependent learning is established, the biochemical and molecular mechanisms underlying these processes are poorly understood. The present study intended to investigate whether administration of morphine ...
متن کاملUse of methadone in the morphine-tolerant burned paediatric patient.
We describe the successful use of methadone in the restoration of sedation and provision of analgesia in two morphine-tolerant, paediatric patients who had suffered significant thermal injuries and were undergoing mechanical ventilation. Both patients had exhibited escalating requirements for sedative drugs while undergoing ventilation yet remained inadequately sedated. The introduction of i.v....
متن کاملEffects of Venlafaxine & Methadone Alone and in Combination with Spontaneous Morphine withdrawal Syndrome & Pain Sensation in Rats
Introduction: Methadone has been used as a drug to detoxify opioid tolerance. Naloxane precipitated morphine withdrawal behaviours were attenuated by venlafaxine as an antidepressant. On the contrary, after detoxifying the opioids, spontaneous withdrawal syndrome may occur with pain sensitivity. Therefore the present study aimed to examine the effects of chronic methadone (70 mg/kg, in dr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of neuroimmunology
دوره 196 1-2 شماره
صفحات -
تاریخ انتشار 2008