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Cell:晒太阳也能上瘾?

2014-06-23 佚名 生物360

虽然明知道有增加皮肤癌患病几率的风险,但总有那么一批人,一到夏天就涌向海滩,享受阳光的热度。今天发表在《细胞》Cell 杂志上的一篇文章表明,他们可能已经对阳光“上瘾”了——根据研究人员的发现,如果长期暴露在紫外线下的话,人体可能会分泌出一种让自己感觉愉悦的信号分子:内啡肽(endorphin)。内啡肽与海洛因等药物作用于同样的通路,能在鼠类中引起生理依赖、药物耐受和类似成瘾的行为。这就是为何人们

虽然明知道有增加皮肤癌患病几率的风险,但总有那么一批人,一到夏天就涌向海滩,享受阳光的热度。今天发表在《细胞》Cell 杂志上的一篇文章表明,他们可能已经对阳光“上瘾”了——根据研究人员的发现,如果长期暴露在紫外线下的话,人体可能会分泌出一种让自己感觉愉悦的信号分子:内啡肽(endorphin)。内啡肽与海洛因等药物作用于同样的通路,能在鼠类中引起生理依赖、药物耐受和类似成瘾的行为。这就是为何人们本能地受到阳光的吸引,而无惧日晒带来的健康风险。

论文第一作者、哈佛医学院的 David Fisher 表示:“这一发现可以用来规劝人们,为了降低皮肤癌风险和避免皮肤加速老化,应该尽力避免过度日晒,”。“我们应该更加主动的保护自己和孩子们的皮肤。”

皮肤癌是美国最常见的一种癌症,而嗜好日光浴是这种疾病的一个重要风险因子。此前一些研究(尤其是针对室内日光浴设备的研究)显示,许多嗜好日光浴的人已经符合物质相关障碍(substance-related disorder)的临床标准,但人们并不了解这种成瘾行为背后的具体机制。皮肤在UV照射下能够产生天然应答,生产出POMC蛋白。这一蛋白随后被切成几个小片段,其中一个片段可诱导黑色素生成,而另一个片段会使皮肤合成beta-内啡肽。内啡肽能够通过激活阿片受体缓解疼痛,其作用通路与止疼药、吗啡和海洛因相同。

Fisher 及其团队希望知道,上述通路是否与UV成瘾有关。他们在六周时间里,每天对剃了毛的小鼠进行UV照射,照射量相当于白种人在佛罗里达正午的阳光里呆20-30分钟。研究显示,小鼠血液中的内啡肽水平在一个星期以内就出现了增长。六周之后,研究人员用阻断阿片受体的药物处理这些小鼠。结果是,小鼠出现了包括战栗、颤抖、牙齿振颤在内的脱瘾症状,并且会避开给药的地点。这说明慢性UV照射引起了小鼠的生理依赖和类似成瘾的行为。

Fisher 表示:“人类天生就容易对紫外线这么危险的东西上瘾,这令我们感到非常惊讶,UV可能是世界上最常见的一种致癌物了。我们认为,这可能是因为UV有助于皮肤中的维生素D合成。然而,现在有更加安全可靠的维生素D来源(不会因此而致癌),所以为了健康着想我们不应该再一味追求日晒。”

原始出处:

Gillian L. Fell, Kathleen C. Robinson, Jianren Mao, Clifford J. Woolf, David E. Fisher. Skin β-Endorphin Mediates Addiction to UV Light. Cell, 19 June 2014;

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    2014-10-08 lindachild

    本人的经验是,为了预防光老化而下意识的防晒动作,也是会上瘾的嘿嘿

    0

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    2015-01-07 amyloid
  3. [GetPortalCommentsPageByObjectIdResponse(id=12032, encodeId=10dc120323c, content=本人的经验是,为了预防光老化而下意识的防晒动作,也是会上瘾的嘿嘿, beContent=null, objectType=article, channel=null, level=null, likeNumber=112, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=092b96053, createdName=lindachild, createdTime=Wed Oct 08 05:16:00 CST 2014, time=2014-10-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1951628, encodeId=0b00195162886, content=<a href='/topic/show?id=bd5259e63d9' target=_blank style='color:#2F92EE;'>#晒太阳#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=59763, encryptionId=bd5259e63d9, topicName=晒太阳)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=325a197, createdName=amyloid, createdTime=Wed Jan 07 05:48:00 CST 2015, time=2015-01-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1959084, encodeId=c62d19590843c, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Mon Jun 08 08:48:00 CST 2015, time=2015-06-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1649652, encodeId=b3ba1649652bc, content=<a href='/topic/show?id=411d20003f3' target=_blank style='color:#2F92EE;'>#上瘾#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=20003, encryptionId=411d20003f3, topicName=上瘾)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=1a6523894616, createdName=wangyang7966, createdTime=Fri Dec 05 06:48:00 CST 2014, time=2014-12-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=10856, encodeId=df131085651, content=研究者的思维令人钦佩, beContent=null, objectType=article, channel=null, level=null, likeNumber=151, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/UibwsCIqUomb0XFG5wxowcjvLxRyYuO0l5q2IGxx4icISWVVmiaUeavbRetqvAjdWPYMfHM2GMSV5wnMMWRz8VNLw/132, createdBy=42aa106928, createdName=yayale, createdTime=Mon Aug 04 12:01:00 CST 2014, time=2014-08-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=10334, encodeId=31f21033430, content=怪不得晒太阳的时候无比愉悦呢,原来是这样子滴, beContent=null, objectType=article, channel=null, level=null, likeNumber=144, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=42e3105098, createdName=sunxiaofei4457, createdTime=Tue Jul 08 09:46:00 CST 2014, time=2014-07-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1868841, encodeId=a350186884103, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Mon Feb 09 12:48:00 CST 2015, time=2015-02-09, status=1, ipAttribution=)]
    2015-06-08 维他命
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    2014-08-04 yayale

    研究者的思维令人钦佩

    0

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    2014-07-08 sunxiaofei4457

    怪不得晒太阳的时候无比愉悦呢,原来是这样子滴

    0

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