en نانوجنین‌شناسی: از مشاهدهٔ تکوین تا مهندسی آن در مقیاس نانو جنين شناسي Embryology نامه به سردبیر Letter to the Editor <p style="text-align: justify;"><span style="font-size:12pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">For nearly a century, embryology was largely a descriptive science. We were careful and precise observers, but ultimately passive ones. Microscopic images, serial sections, and detailed fate maps taught us a great deal about what happens during development, yet they left one fundamental question unanswered: Could we actually intervene in this delicate, highly orchestrated process without disrupting its balance?</span></span></span><br> <span style="font-size:12pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Today, thanks to the convergence of nanotechnology and developmental biology, the answer has shifted from &ldquo;perhaps&rdquo; to a qualified but exciting &ldquo;yes.&rdquo; The emerging field I call nano-embryology has matured enough to tackle three profound challenges at once: How can we deliver molecular signals to the embryo with true spatial and temporal precision? How can we extract real-time information about the embryo&rsquo;s internal state without causing harm? And, critically, might the nanoscale tools themselves pose risks to normal development?</span></span></span><br> <span style="font-size:12pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The first major advance comes from intelligent nanocarriers. These are no longer simple delivery vehicles. Engineered from light-sensitive lipids, pH-responsive polymers, or superparamagnetic iron oxide nanoparticles, they can release their cargo, such as key morphogens like Sonic Hedgehog or BMP4, not diffusely but at a specific location and moment within embryonic tissue. Imagine loading a neural differentiation factor onto such a particle and positioning it on the left side of a mouse embryo&rsquo;s neural plate or during neural tube closure around embryonic day E8.0 to E9.0. A precisely timed near-infrared or magnetic stimulus then triggers release only in that region.</span></span></span></p> Nano-embryology, Embryonic development, Nanocarriers, Nanosensors 210 211 http://jabs.fums.ac.ir/browse.php?a_code=A-10-2093-5&slc_lang=en&sid=1 Ghader Allahverdi قادر اله وردی 100319475328460030889 100319475328460030889 No Journal of Advanced Biomedical Sciences, Fasa University of Medical Sciences, Fasa, Iran مجله علوم زیست‌پزشکی پیشرفته، دانشگاه علوم پزشکی فسا، فسا، ایران Majid Naghdi مجید نقدی 100319475328460030890 100319475328460030890 Yes Department of Anatomy, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran گروه آناتومی، دانشکده پزشکی، دانشگاه علوم پزشکی شیراز، شیراز، ایران Zahra Piran زهرا پیران 100319475328460030891 100319475328460030891 No Journal of Advanced Biomedical Sciences, Fasa University of Medical Sciences, Fasa, Iran مجله علوم زیست‌پزشکی پیشرفته، دانشگاه علوم پزشکی فسا، فسا، ایران