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Posted: Oct 03, 2012
Nanotechnology against aging
(Nanowerk News) A team of Spanish scientists has developed an intelligent nanodevice that lays the foundations for the future development of new therapies against aging. The device consists of nanoparticles that can selectively release drugs in aged human cells. Its potential future use ranges from the treatment of diseases involving tissue or cellular degeneration such as cancer, Alzheimer's or Parkinson's, among others, to accelerated aging disorders (progeria).
This research has been carried out by the Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Mixed Unit Universitat Politècnica de València - Universitat de València; the Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), the Instituto de Investigaciones Biomédicas (CSIC/UAM), the CIBER of Rare Diseases (CIBERER) and CIBER on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN). The work has been published in the prestigious journal Angewandte Chemie ("Targeted Cargo Delivery in Senescent Cells Using Capped Mesoporous Silica Nanoparticles").
Internalization and controlled release of the fluorescent molecule rhodamine in senescent fibroblasts of patients with dyskeratosis congenita, by MSN-S1 nanodevice.
"The nanodevice that we have developed consists of mesoporous nanoparticles with a galactooligosaccharide outer surface that prevents the release of the load and that only selectively opens in degenerative phase cells or senescent cells. The proof of concept demonstrates for the first time that selected chemicals can be released in these cells and not in others," says Ramón Martínez Máñez, researcher at the IDN Centre - Universitat Politècnica de València and CIBER-BBN member.
José Ramón Murguía, a researcher at the Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC) and also a CIBER-BBN member, explains that senescence is a physiological process of the body to eliminate aged cells or ones with alterations that may compromise their viability. "When we are young senescence mechanisms prevent, for example, the appearance of tumors, the problem is that with age senescent cells accumulate in organs and tissues, disrupting their proper functioning. The elimination of these cells would slow down the appearance of diseases associated with aging. Our work shows that we can develop a targeted therapy against these cells," says Murguía.
The researchers have evaluated the utility of the new nanodevices in primary cell cultures derived of patients with accelerated aging syndrome dyskeratosis congenita (DC). Such cultures show a high percentage of senescence characterized by elevated levels of beta-galactosidase activity, an enzyme characteristic of senescent state. "The aging cells overexpress this enzyme so we have designed nanoparticles that open when detected and release their contents in order to eliminate senescent cells, prevent deterioration or even reactivate for their rejuvenation," explains Murguía. "There are a number of diseases associated with premature aging of tissues, many of which affect very young patients and for whom there is no therapeutic alternative, as in the case of DC or aplastic anemia. Other diseases affect adults, as idiopathic pulmonary fibrosis or liver cirrhosis. These nanoparticles represent a unique opportunity to selectively deliver therapeutic compounds to affected tissues and rescue their viability and functionality" explains Rosario Perona, researcher at the Instituto de Investigaciones Biomédicas (CSIC/UAM) and CIBERER member.
The next step of this research is to test the devise with therapeutic agents and validate it in animal models. "As far as we know this is the first time that a nanotherapy for senescent cells has been described. Although there is still far to go from these results to the possible elimination of senescent cells or rejuvenation therapies, we believe that our research may open new paths for developing therapies for the treatment of age-related diseases," says Ramón Martínez Máñez.
According to the researchers, the nanodevice they have designed can also be useful for developing cosmetic therapies for external use for improving skin and hair, as an anti-wrinkle or anti-aging treatment, or a UV radiation shield or to address alopecia, all of which are associated with the accumulation of senescent cells, conclude Martínez Máñez and Murguía.